Fuel pump support assembly liquid level sensor testing equipment

Abstract

The invention relates to fuel pump support assembly liquid level sensor testing equipment which comprises a liquid level sensor, a lifting testing machine, a resistance detector and an oscilloscope, the liquid level sensor comprises a potentiometer, a floater and a floating rod, the potentiometer is provided with a shell, a resistor body, a movable contact and a contact support, the resistor body is installed in the shell, and the movable contact is arranged on the contact support. One end of the floating rod is connected with the floater, the other end of the floating rod is in transmission connection with the contact support, the lifting testing machine drives the floater to move up and down, the liquid level sensor outputs a resistance signal corresponding to the real-time position of the floater, and the resistance detector is electrically connected with the liquid level sensor. And the oscilloscope is in signal connection with the resistance detector, and is used for converting a resistance signal into an oscillogram which is visually presented in real time and storing test data. The device can automatically simulate oil level changes, synchronously collect resistance and waveform signals, and rapidly identify contact faults.

Description

Technical Field

[0001] This invention relates to the field of automotive fuel system component testing technology, specifically a fuel pump bracket assembly level sensor testing device. Background Technology

[0002] The fuel level sensor in the fuel pump bracket assembly is a core component for acquiring fuel level signals in a vehicle's fuel tank. The float-type fuel level sensor uses a float that moves with the fuel level, linking to a potentiometer to change the resistance value and output a signal. The reliability of the contact between the float and the resistive element is crucial to the accuracy of the fuel level display. Therefore, the fuel level sensor must undergo precise and efficient performance testing before leaving the factory to ensure its operational stability and ultimately guarantee the accuracy of the fuel level display. However, traditional manual testing methods have significant drawbacks. They rely on manual float movement, failing to reproduce the high-frequency, dynamic fuel level changes in actual driving scenarios. The testing conditions are disconnected from real-world usage. Furthermore, readings from a resistance meter only indicate the current resistance value, failing to visually represent the dynamic changes in resistance during float movement. Due to the limited response speed of manual testing, it is difficult to capture transient or intermittent faults such as power outages or contact failures, or hidden problems like poor contact. The instantaneous data of resistance jumps cannot be recorded, and there is no systematic data retention during the testing process, making it impossible to retrospectively analyze the resistance change trajectory and support batch quality control and problem tracing. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art. This invention provides a fuel pump bracket assembly liquid level sensor testing device that can automatically simulate oil level changes, synchronously collect resistance and waveform signals, and quickly identify contact faults.

[0004] The technical solution of the present invention: a fuel pump bracket assembly liquid level sensor testing device, including a liquid level sensor, a lifting test machine, a resistance detector and an oscilloscope; the liquid level sensor includes a potentiometer, a float and a float rod, the potentiometer includes a housing, a resistive element, a moving contact and a contact support, the resistive element is mounted on the housing, the moving contact is disposed on the contact support, and the contact support is rotatably mounted on the housing to drive the moving contact to slide circumferentially along the surface of the resistive element to form an electrical contact; One end of the float rod is connected to the float and the other end is connected to the contact bracket in a transmission connection; the lifting test machine is used to drive the float to move up and down and drive the contact bracket to rotate through the float rod, so that the moving contact slides circumferentially on the resistive body; the liquid level sensor outputs a resistance signal corresponding to the real-time position of the float. The resistance detector is electrically connected to the liquid level sensor and is used to collect and display the resistance value in real time. The oscilloscope is connected to the resistance tester to convert the resistance signal into a waveform for real-time visualization and to store the test data.

[0005] With the above settings, through the combination of a liquid level sensor, a lifting test machine, a resistance detector and an oscilloscope, the automatic test of the liquid level sensor of the fuel pump bracket assembly is realized. There is no need to manually adjust the position of the float, which greatly improves the test efficiency. At the same time, through the resistance signal acquisition and waveform visualization, the resistance changes corresponding to different positions of the float are accurately captured, ensuring the accuracy and traceability of the test data, and it is applicable to the product quality inspection in mass production.

[0006] A further setting of the present invention: a float rod bracket is sleeved on the other end of the float rod. The float rod bracket is arranged outside the potentiometer housing and is传动连接 with the contact bracket inside the housing through a connecting rod. The connecting rod is rotationally配合 with the rod hole opened on the housing.

[0007] With the above technical solution, the design of the传动连接 between the float rod bracket and the connecting rod enables the lifting movement of the float rod to be transmitted to the contact bracket more smoothly and accurately. The rotational配合 between the connecting rod and the rod hole of the housing ensures the flexibility of the transmission process and avoids jamming.

[0008] A further setting of the present invention: the connecting rod is fixedly连接 with the float rod bracket and构成插接配合 with the contact bracket. One end of the connecting rod is provided with a插接端, and a插孔 is correspondingly provided on the contact bracket. The插接端 is inserted into the插孔 to实现 the circumferential联动 between the connecting rod and the contact bracket.

[0009] With the above technical solution, the插接配合 design between the connecting rod and the contact bracket makes the installation and disassembly process simpler and faster, facilitating the maintenance and repair of the equipment. The precise配合 between the插接端 and the插孔 further improves the accuracy of the transmission of the lifting movement of the float rod to the contact bracket.

[0010] A further setting of the present invention: the插接端 is in a "one" - shaped structure, and the插孔 is a "one" - shaped hole.

[0011] With the above technical solution, the "one" - shaped插接配合 between the connecting rod and the contact bracket实现 the circumferential fixation between the two, ensuring that the contact bracket can rotate synchronously when the float rod rotates without relative slipping, improving the transmission accuracy. This插接 structure is also convenient for disassembly and maintenance. When the components are damaged, they can be quickly replaced, reducing the maintenance cost.

[0012] A further setting of the present invention: an elastic snap hook is provided on the connecting rod, a lock hole is provided on the contact bracket, and a tongue piece is provided in the lock hole. The elastic snap hook is inserted into the lock hole and勾合 with the tongue piece to实现 the anti - detachment limit between the contact bracket and the connecting rod.

[0013] It should be noted that there are some incorrect or incomplete expressions in the original Chinese text, such as "传动连接", "构成插接配合", etc. I have translated them according to the context as best as possible, but they may not be standard mechanical terms. You may need to check and correct them according to the actual situation.By adopting the above technical solution, the engagement design of the elastic hook and the locking hole tongue realizes the anti-disengagement limit of the connecting rod and the contact bracket, avoiding the separation of the two due to vibration or external force during the test, thus ensuring the stability and service life of the test equipment; the tilted setting of the tongue facilitates the insertion of the elastic hook during assembly, improving the ease of operation.

[0014] A further feature of the present invention is that one end of the elastic hook is integrally connected to the float support, the insertion end has a notch on one side of the corresponding elastic hook for it to move, one end of the tongue is integrally connected to the inner wall of the lock hole, and the tongue is inclined along the insertion direction of the elastic hook.

[0015] The above technical solution provides space for the movement of the elastic hook by setting the notch at the plug end, ensuring that it can smoothly engage with the tongue and further improving the reliability of the connection. The design of the tongue inclined along the insertion direction not only facilitates the insertion of the elastic hook, but also forms a better engagement effect after insertion, preventing the elastic hook from accidentally coming out, thereby better realizing the function of anti-disengagement and limiting.

[0016] A further feature of the present invention is that the float support is provided with an assembly hole and a fastening element. The assembly hole is used for inserting the float, and the fastening element includes a stop arm and an elastic arm, which cooperate to clamp and position the float.

[0017] The above technical solution utilizes an assembly hole design that allows the float to be accurately inserted into the float bracket, providing a foundation for float positioning. The locking mechanism, particularly the cooperation between the stop arm and the elastic arm, effectively clamps the float, preventing it from loosening or falling off during testing due to vibration or external forces, thus ensuring the accuracy and stability of the test. This design not only improves the reliability of the testing equipment but also extends its service life.

[0018] A further feature of the present invention is that: a resistor support is provided inside the potentiometer housing, the resistor is mounted on the resistor support, the resistor support has an arc-shaped groove, and one end of the contact support is provided with a sliding end that can slide along the arc-shaped groove.

[0019] By adopting the above technical solution, the arc-shaped groove of the resistor bracket provides a guiding function for the sliding end of the contact bracket, enabling the contact bracket to slide along a predetermined trajectory. This ensures that the moving contact can slide precisely circumferentially along the surface of the resistor, avoiding abnormal resistance signals caused by deviation from the track, thereby ensuring the stability and accuracy of the potentiometer during the adjustment process.

[0020] A further embodiment of the present invention: the potentiometer is mounted on the outer wall of the fuel tank of the fuel pump bracket. The outer wall of the fuel tank is provided with a potentiometer insertion area. The insertion area has slots on both sides and a latch on its rear wall. The potentiometer housing has inserts on both sides and an elastic retaining plate on its rear wall. At least one insert is an elastic structure. The elastic retaining plate is tilted backward and has a retaining block on its free end. When the potentiometer housing is inserted downward into the insertion area, the retaining block on the elastic retaining plate on the rear wall of the housing engages with the latch. The inserts on both sides of the housing are respectively engaged in the corresponding slots. The potentiometer housing is also provided with a lug that abuts against the upper surface of the fuel tank.

[0021] By adopting the above technical solution, the potentiometer's insert-type design enables rapid assembly and disassembly of the potentiometer to the outer wall of the fuel tank. The elasticity of the flexible insert and the flexible retaining plate compensates for assembly errors, resulting in a tighter connection. Simultaneously, the abutment design of the lug ensures stable installation of the potentiometer on the outer wall of the fuel tank. This design not only improves assembly efficiency but also enhances the overall stability and reliability of the equipment, providing strong support for the accurate testing of the fuel pump bracket assembly level sensor.

[0022] A further embodiment of the present invention: the lifting test machine includes a base, a scale, and a test platform for carrying the float. The scale is fixed to the base, and the test platform is disposed on the scale and is driven to slide up and down by a power component. The power component includes a motor and meshing gears and racks. The rack is fixedly connected to the test platform. The motor drives the gears to rotate, and the rack drives the test platform and the float placed on it to move up and down.

[0023] With the above-mentioned further design, the gear and rack transmission mechanism has a simple structure and high transmission efficiency, enabling smooth lifting and lowering of the test platform; the fixed connection between the rack and the test platform ensures the reliability of the transmission and eliminates relative displacement; the sliding design of the test platform along the scale further ensures the lifting accuracy, allowing the float to accurately stop at the set position and improving the accuracy of the test data. Attached Figure Description

[0024] Figure 1 This is a structural diagram of a specific embodiment of the present invention; Figure 2 This is an assembly diagram of the liquid level sensor and the oil storage tank according to a specific embodiment of the present invention; Figure 3 This is a structural diagram of a liquid level sensor according to a specific embodiment of the present invention; Figure 4 This is a potentiometer structure diagram of a specific embodiment of the present invention; Figure 5 This is a potentiometer structure diagram of a specific embodiment of the present invention; Figure 6 This is a diagram showing the internal structure of a potentiometer according to a specific embodiment of the present invention; Figure 7 This is an assembly diagram of the contact bracket and the float bracket in a specific embodiment of the present invention; Figure 8 This is a structural diagram of the float support according to a specific embodiment of the present invention; Figure 9 This is a structural diagram of the float support according to a specific embodiment of the present invention; Figure 10 This is a structural diagram of the contact support according to a specific embodiment of the present invention; Figure 11 This is a contact diagram of the contact element and the resistive element in a specific embodiment of the present invention; Figure 12 This is a structural diagram of an oil storage tank according to a specific embodiment of the present invention; Figure 13 This is a schematic diagram of the lifting test machine according to a specific embodiment of the present invention.

[0025] In the diagram: 1. Liquid level sensor; 2. Lifting tester; 3. Resistance meter; 4. Oscilloscope; 11. Potentiometer; 12. Float; 13. Float rod; 14. Float rod bracket; 15. Connecting rod; 10. Oil tank; 101. Insertion area; 1011. Slot; 1012. Bayonet; 1111. Potentiometer housing; 1111. Rod hole; 1112. Insert; 1113. Elastic plate; 1114. Locking block; 1115. Lug; 1115. Resistor; 112. Moving contact; 113. Contact bracket. 14. Resistor bracket 115. Arc groove 1151. Socket 1141. Lock hole 1142. Tongue 1143. Sliding end 1144. Plug-in end 151. Notch 1511. Elastic hook 152. Assembly hole 141. Buckle 142. Stop arm 1421. Elastic arm 1422. Base 21. Scale 22. Test platform 23. Power assembly 24. Gear 241. Rack 242. Front shell 1116. Rear shell 1117. Detailed Implementation

[0026] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] like Figure 1-13As shown, a fuel pump bracket assembly liquid level sensor testing device of the present invention includes a liquid level sensor 1, a lifting test machine 2, a resistance detector 3, and an oscilloscope 4; the liquid level sensor 1 includes a potentiometer 11, a float 12, and a float rod 13; the potentiometer 11 includes a housing 111, a resistive element 112, a moving contact 113, and a contact bracket 114; the resistive element 112 is installed inside the housing 111; the moving contact 113 is inserted into the contact bracket 114 or fixed with screws; the contact bracket 114 is rotatably installed on the housing 111 so as to drive the moving contact 113 to slide circumferentially along the surface of the resistive element 112 to form an electrical contact; One end of the float rod 13 is connected to the float 12 and the other end is connected to the contact bracket 114 via a transmission connection. The float is sleeved on the float rod. The lifting test machine 2 is used to drive the float 12 to move up and down and drive the contact bracket 114 to rotate through the float rod 13, so that the moving contact 113 slides circumferentially on the resistive body 112. The liquid level sensor 1 outputs a resistance signal corresponding to the real-time position of the float 12. The resistance detector 3 is electrically connected to the liquid level sensor 1 and is used to collect and display the resistance value in real time. The oscilloscope 4 is connected to the resistance detector 3 and is used to convert the resistance signal into a waveform for real-time visualization and to store the test data.

[0028] Specifically, a float bracket 14 is fitted onto the other end of the float rod 13. The float bracket 14 is located outside the potentiometer housing 111 and is connected to the contact bracket 114 inside the housing 111 via a connecting rod 15. The connecting rod 15 is rotatably engaged with a rod hole 1111 on the housing 111. The connecting rod 15 is integrally fixed to the rear end wall of the float bracket 14 and forms a plug-in engagement with the contact bracket 114. One end of the connecting rod 15 has a plug-in end 151, and the contact bracket 114 has a corresponding plug hole 1141. The plug-in end 151 is inserted into the plug hole 1141 to achieve circumferential linkage between the connecting rod 15 and the contact bracket 114. The plug-in end 151 has a straight "I" structure, and the plug hole 1141 is a straight "I" hole. Of course, the plug-in end can be square, triangular, or other structures, and the plug hole can be a square hole or a triangular hole, etc.

[0029] Specifically, the connecting rod 15 is integrally provided with an elastic hook 152, and the contact bracket 114 is provided with a locking hole 1142, and the locking hole 1142 has a tongue 1143 inside. The elastic hook 152 is inserted into the locking hole 1142 and engages with the tongue 1143 to achieve anti-disengagement and limiting of the contact bracket 114 and the connecting rod 15. One end of the elastic hook 152 is integrally connected to the float bracket 14, and the insertion end 151 has a notch 1511 on the side corresponding to the elastic hook for its movement. One end of the tongue 1143 is integrally connected to the inner wall of the locking hole 1142, and the tongue 1143 is inclined along the insertion direction of the elastic hook 152. Specifically, the front wall of the float support 14 is provided with an assembly hole 141 and a fastener 142. The assembly hole 141 is used for inserting the float 13. The fastener 142 includes a stop arm 1421 and an elastic arm 1422, which cooperate to clamp and position the float 13. Specifically, the potentiometer housing 111 is provided with a resistor support 115. The resistor 112 is mounted on the resistor support 115. The resistor support 115 has an arc-shaped groove 1151. One end of the contact support 114 is provided with a sliding end 1144 that can slide along the arc-shaped groove 1151. The sliding end 1144 can slide into the arc-shaped groove 1151. Specifically, the potentiometer 11 is mounted on the outer wall of the fuel tank 10 of the fuel pump bracket. The outer wall of the fuel tank 10 is provided with a potentiometer insertion area 101. The insertion area 101 has slots 1011 on both sides and a bayonet 1012 on its rear wall. The potentiometer housing 111 has inserts 1112 on both sides and an elastic retaining plate 1113 on its rear wall. At least one insert 1112 is an elastic structure. The elastic retaining plate 1113 is tilted backward and has a retaining block 1114 on its free end. When the potentiometer housing 111 is inserted downward into the insertion area 101, the retaining block 1114 on the elastic retaining plate 1113 on the rear wall of the housing 111 engages with the bayonet 1012. The inserts 1112 on both sides of the housing 111 are respectively inserted into the corresponding slots 1011. The potentiometer housing 111 is also provided with a lug 1115 that abuts against the upper surface of the fuel tank 10. The potentiometer housing 111 includes a front housing 1116 and a rear housing 1117. The front housing and the rear housing are detachably connected and form a receiving cavity. The resistive element and the moving contact are both disposed in the receiving cavity. The insert 1112 and the elastic retaining plate 1113 are disposed on the rear housing, and the rod hole is disposed on the front housing.

[0030] Specifically, the lifting test machine 2 includes a base 21, a scale 22, and a test platform 23 for supporting the float. The scale 22 is fixed to the base 21, and the test platform 23 is mounted on the scale 22 and is driven to slide up and down by a power component 24. The power component 24 includes a motor (not shown in the figure) and a meshing gear 241 and a rack 242. The rack 242 is fixedly connected to the test platform 23. The motor drives the gear 241 to rotate, which in turn drives the test platform 23 and the float 12 placed on it to move up and down through the rack 242. Alternatively, other structures such as pulley systems can be used to drive the test platform to move up and down. The scale surface has evenly distributed graduation lines, which allows operators to accurately read the height of the test platform and obtain the specific position information of the float during liquid level changes. This provides reliable data for subsequent performance testing and analysis of the fuel pump bracket assembly liquid level sensor.

[0031] This equipment is based on the resistance change principle of a "float-potentiometer" and combines an automated lifting mechanism and electrical testing equipment to achieve accurate testing of liquid level sensors.

[0032] When using it, first assemble the potentiometer onto the outer wall of the oil reservoir, specifically by inserting the outer casing downwards into the mounting area on the outer wall of the oil reservoir.

[0033] 1. Lifting Drive: Start the motor, and the motor output shaft drives the gear to rotate. Since the gear and rack mesh with each other, the rack moves up and down with the rotation of the gear, which in turn drives the test platform, which is fixedly connected to the rack, to slide up and down along the scale. The float placed on the test platform rises and falls synchronously to simulate the change of liquid level in the fuel tank.

[0034] 2. Signal generation: When the float rises or falls, it drives the float rod to rotate around the rotation point of the connecting rod and the outer shell. The float rod drives the contact support to rotate through the float rod support and the connecting rod. The moving contact on the contact support slides circumferentially along the surface of the resistive element. Since the resistance value of the resistive element changes with the position of the contact point, the liquid level sensor outputs a resistance signal corresponding to the real-time position of the float.

[0035] 3. Signal Detection and Presentation: The resistance detector acquires the resistance signal output by the liquid level sensor in real time and converts it into a displayable value, intuitively presenting the resistance value corresponding to the current float position; the oscilloscope is connected to the resistance detector to convert the resistance signal into a waveform for real-time visualization, making it easy to observe the trend of resistance signal changes; at the same time, the oscilloscope can store the waveform data and resistance detector numerical data during the test process for subsequent analysis and traceability, completing the entire test process.

[0036] It should be noted that in the description of this invention, all directional indications (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0037] Furthermore, in this invention, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A fuel pump bracket assembly level sensor testing device, characterized in that, It includes a liquid level sensor (1), a lifting tester (2), a resistance detector (3) and an oscilloscope (4); the liquid level sensor (1) includes a potentiometer (11), a float (12) and a float rod (13), the potentiometer (11) includes a housing (111), a resistance body (112), a moving contact (113) and a contact support (114), the resistance body (112) is installed in the housing (111), the moving contact (113) is arranged on the contact support (114), and the contact support (114) is rotatably installed in the housing (111) to drive the moving contact (113) to slide circumferentially along the surface of the resistance body (112) to form an electrical contact; One end of the float rod (13) is connected to the float (12), and the other end is in transmission connection with the contact support (114); the lifting tester (2) is used to drive the float (12) to move up and down and drive the contact support (114) to rotate through the float rod (13), so that the moving contact (113) slides circumferentially on the resistance body (112), and the liquid level sensor (1) outputs a resistance signal corresponding to the real-time position of the float (12); The resistance detector (3) is electrically connected to the liquid level sensor (1) and is used to collect and display the resistance value in real time; The oscilloscope (4) is signal-connected to the resistance detector (3) and is used to convert the resistance signal into a waveform diagram for real-time visualization and store the test data.

2. The fuel pump bracket assembly level sensor testing device according to claim 1, characterized in that, A float rod support (14) is sleeved on the other end of the float rod (13). The float rod support (14) is arranged outside the potentiometer housing (111) and is in transmission connection with the contact support (114) inside the housing (111) through a connecting rod (15). The connecting rod (15) is rotationally matched with a rod hole (1111) opened on the housing (111).

3. The fuel pump bracket assembly level sensor testing device according to claim 2, characterized in that, The connecting rod (15) is fixedly connected to the float rod support (14) and forms a plug-in fit with the contact support (114). One end of the connecting rod (15) is provided with a plug-in end (151), and a jack (1141) is correspondingly provided on the contact support (114). The plug-in end (151) is inserted into the jack (1141) to realize the circumferential linkage between the connecting rod (15) and the contact support (114).

4. The fuel pump bracket assembly level sensor testing device according to claim 3, characterized in that, The plug-in end (151) is in a "one" character structure, and the jack (1141) is a "one" character hole.

5. The fuel pump bracket assembly level sensor testing device according to claim 3, characterized in that, An elastic catch (152) is provided on the connecting rod (15), a lock hole (1142) is provided on the contact support (114), and a tongue piece (1143) is arranged in the lock hole (1142). The elastic catch (152) is inserted into the lock hole (1142) and is hooked with the tongue piece (1143) to realize the anti-disengagement limit between the contact support (114) and the connecting rod (15).

6. The fuel pump bracket assembly level sensor testing device according to claim 5, characterized in that, One end of the elastic catch (152) is integrally connected to the float rod support (14). The plug-in end (15) has a notch (1511) for its movement on the side corresponding to the elastic catch. One end of the tongue piece (1143) is integrally connected to the inner wall of the lock hole (1142), and the tongue piece (1143) is inclined along the insertion direction of the elastic catch (152).

7. The fuel pump bracket assembly level sensor testing device according to any one of claims 2-6, characterized in that, The float support (14) is provided with an assembly hole (141) and a fastener (142). The assembly hole (141) is used for inserting the float (13). The fastener (142) includes a stop arm (1421) and an elastic arm (1422). The stop arm (1421) and the elastic arm (1422) cooperate to clamp and position the float (13).

8. The fuel pump bracket assembly level sensor testing device according to any one of claims 1-6, characterized in that, The potentiometer housing (111) is provided with a resistor support (115), the resistor (112) is mounted on the resistor support (115), the resistor support (115) has an arc groove (1151), and one end of the contact support (114) is provided with a sliding end (1144) that can slide along the arc groove (1151).

9. The fuel pump bracket assembly level sensor testing device according to any one of claims 1-6, characterized in that, The potentiometer (11) is mounted on the outer wall of the fuel tank (10) of the fuel pump bracket. The outer wall of the fuel tank (10) is provided with a potentiometer insertion area (101). The insertion area (101) has slots (1011) on both sides and a bayonet (1012) on its rear wall. The potentiometer housing (111) has inserts (1112) on both sides and an elastic retaining plate (1113) on its rear wall. At least one insert (1112) is an elastic structure. The elastic retaining plate (1113) is rearward. The potentiometer housing (111) is tilted and has a locking block (1114) on its free end. When the potentiometer housing (111) is inserted downward into the insertion area (101), the locking block (1114) on the elastic locking plate (1113) on the rear wall of the housing (111) engages with the locking slot (1012). The inserts (1112) on both sides of the housing (111) are respectively inserted into the corresponding slots (1011). The potentiometer housing (111) is also provided with a lug (1115) that abuts against the upper end face of the oil storage tank (10).

10. The fuel pump bracket assembly level sensor testing device according to claim 1, characterized in that: The lifting test machine (2) includes a base (21), a scale (22) and a test platform (23) for carrying the float. The scale (22) is fixed to the base (21). The test platform (23) is set on the scale (22) and is driven to slide up and down by a power component (24). The power component (24) includes a motor and meshing gears (241) and racks (242). The rack (242) is fixedly connected to the test platform (23). The motor drives the gears (241) to rotate, and the rack (242) drives the test platform (23) and the float (12) placed on it to move up and down.

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