Fuel pump assembly

Abstract

The fuel pump assembly comprises a flange, a pressure regulator, a jet pump assembly, a pump core, a coarse filter, an oil storage barrel, a liquid level sensor, a plurality of corrugated pipes and an oil suction pipe. The pump core, the jet pump assembly and the flange sequentially form an oil way from the pump core to the flange in the direction. The pump core is provided with two oil outlet pipelines, one oil outlet pipeline is connected with a flange through a corrugated pipe to convey fuel oil to an engine, and the other oil outlet pipeline is connected with the jet pump assembly through a corrugated pipe to convey fuel oil in an oil tank to an oil storage barrel. A pressure regulator is arranged in the flange, and when the pressure in the oil way is too large, fuel oil flows into the oil storage barrel through the pressure regulator. The jet pump assembly is provided with at least two front and back oil suction pipes, and coarse filter pipes are arranged at the tail ends of the oil suction pipes. The tail ends of the oil suction pipes are arranged at the bottoms of the front tail end and the rear tail end of the oil tank respectively. According to the arrangement mode, the fuel supply stability when the vehicle runs on a ramp for a long time can be remarkably improved, and the cruising ability of the vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the field of fuel supply systems, and in particular to a fuel pump assembly technology suitable for a snowmobile, and aims to improve fuel supply stability and system reliability under complex working conditions. Background Art

[0002] In the internal combustion engine system, the main function of the fuel pump assembly is to transport fuel from the fuel tank to the engine. Its design and performance are directly related to the stability of vehicle operation. In the prior art, traditional sled motorcycle fuel pumps usually adopt a single suction pipe structure. During vehicle driving, especially under long-term slope conditions, the fuel level in the fuel tank is prone to deviation, and the single suction pipe may be unable to effectively absorb fuel, resulting in fuel supply interruption. This phenomenon not only affects the normal operation of the engine, but may also cause power loss or flameout, reducing the reliability and endurance of the vehicle.

[0003] In order to overcome the above problems, the present invention proposes an improved fuel pump assembly, which effectively improves the continuity and stability of fuel supply through the coordinated work of a multi-suction pipe structure and an ejector pump assembly, thereby meeting the use requirements of snowmobiles in complex terrains and extreme environments. Summary of the invention

[0004] The present invention aims to provide a multi-suction pipe fuel pump assembly, which is particularly suitable for a sled motorcycle to cope with complex working conditions such as continuous up and down slopes during driving, ensuring that the fuel pump assembly can always stably draw fuel from the fuel tank, thereby effectively preventing engine stalling or power interruption caused by unstable fuel supply, and improving the operating reliability and safety of the vehicle in complex terrain.

[0005] The present application provides a fuel pump assembly, including a flange, a pressure regulator, an ejector pump assembly, a pump core, a coarse filter, an oil storage barrel, a liquid level sensor, a plurality of bellows and an oil suction pipe, wherein the pump core, the ejector pump assembly and the flange sequentially form an oil circuit from the pump core to the flange. The pump core has two oil outlet pipes, one of which is connected to the flange through a bellows to deliver the fuel to the engine, and the other is connected to the ejector pump assembly through a bellows to deliver the fuel in the fuel tank to the oil storage barrel. A pressure regulator is provided in the flange, and when the pressure in the oil circuit is too high, the fuel flows into the oil storage barrel through the pressure regulator. The ejector pump assembly is provided with at least two oil suction pipes at the front and rear, and a coarse filter pipe is provided at the end of the oil suction pipe. The ends of the oil suction pipe are respectively placed at the bottom of the front and rear ends of the fuel tank.

[0006] Furthermore, it also includes an ejector pump assembly connected to the pump core through a bellows. The ejector pump assembly has at least two oil inlets and at least two oil outlets, and the oil outlets are in the oil storage barrel. At least two oil suction pipes are installed on the oil suction port.

[0007] Furthermore, the two oil suction pipes are arranged in a front-to-rear direction, and the ends thereof are in contact with the bottom of the front and rear ends of the oil tank. The front oil suction pipe is shorter, and the rear oil suction pipe is longer.

[0008] Furthermore, the rear oil suction pipe is a shaped pipe, and the end thereof is designed to be bent downward.

[0009] Furthermore, the ends of the front and rear oil suction pipes are both provided with coarse filter pipes.

[0010] Furthermore, the ejector pump assembly is connected to the flange via a torsion spring.

[0011] The present invention mainly has the following beneficial effects:

[0012] The multi-suction pipe structure adopted in the above-mentioned fuel pump assembly has significant advantages: the multi-suction pipe enhances the inflow of fuel by connecting with the ejector pump assembly, more efficiently meets the fuel demand of the engine under high load and high speed operation, significantly improves the fuel supply stability of the fuel pump assembly under uphill and downhill driving conditions, optimizes the driving performance of the whole vehicle, and effectively extends the vehicle's cruising range.

[0013] The multi-suction pipe fuel pump assembly is adaptable to fuel tanks with complex structures, improves the reliability of fuel supply, effectively alleviates the problem of unstable fuel supply caused by oil level fluctuations, and ensures smooth operation of the engine.

[0014] By optimizing the number and position of the suction pipes, the multi-suction pipe fuel pump assembly significantly improves the fuel supply stability under extreme driving conditions, enhancing the reliability and driving safety of the vehicle. In addition, this design has significant advantages in fuel flow optimization and system simplification, and is particularly favored in high-performance internal combustion engine systems such as sled motorcycles. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an exploded view of the overall components of the fuel pump of the present invention;

[0016] Figure 2 It is a schematic diagram of the state of the fuel pump assembly of the present invention in the fuel tank;

[0017] Figure 3 It is a schematic diagram of the fuel pump assembly of the present invention;

[0018] Figure 4 A schematic diagram of the fuel pump assembly of the present invention when the snowmobile is traveling;

[0019] Figure 5 A second schematic diagram of the fuel pump assembly of the present invention when the snowmobile is traveling;

[0020] Figure 6 The third schematic diagram is a state where the fuel pump assembly of the present invention is in motion on a snowmobile;

[0021] Figure 7 Schematic diagram of the liquid level under different driving conditions when there is a small amount of fuel in the fuel tank of the present invention;

[0022] Figure 8 This is a schematic diagram of the internal oil circuit of the fuel pump assembly of the present invention;

[0023] Figures 9-13 are structural diagrams of the ejector pump assembly in the fuel pump assembly of the present invention; Fig.10 This is a schematic diagram of the ejector pump structure from a top view; Fig.11 It is a schematic diagram of a three-way structure; Fig.12 Schematic diagram of the nozzle structure; Fig.13 It is a schematic diagram of the upper cover structure;

[0024] Figure 14-15 It is a schematic diagram of the connection between the ejector pump component and the front and rear oil suction pipes in the fuel pump assembly of the present invention;

[0025] Fig.16 It is a schematic diagram of the coarse filter structure at the end of the oil suction pipe in the fuel pump assembly of the present invention.

[0026] The following is Figure 1 The names of the fuel pump assembly parts corresponding to the numbers are: 1- retaining ring, 2- pressure regulator, 3- pressure valve cover, 4- retaining ring, 5- bellows, 6- bellows, 7- bellows, 8- power plug, 9- ejector pump assembly, (1)- top cover, (2)- nozzle, (3)- tee, 10- bellows, 11- fuel pump, 12- umbrella valve, 13- oil storage barrel, 14- oil level assembly, 15- resistor plug, 16- coarse filter, 17- torsion spring, 18- bellows, 19- latch, 20- flange, 21- coarse filter pipe, 22- oil suction pipe, 23- oil suction pipe.

[0027] Figure 9a It is an exploded view and actual assembly view of the ejector pump assembly, showing the welding connection structure of the nozzle, tee and top cover, and the actual installation state of the bellows 6, bellows 7 suction pipe 22 and suction pipe 23 in the ejector pump; Figure 9b It is a schematic cross-sectional view of the internal nozzle of the tee, showing the flow splitting design of the 0.5mm nozzle; Fig.9cIt is a schematic diagram of the negative pressure area connected to the tee and the oil suction pipe, which shows the principle that after the fuel is ejected at high speed through two small-diameter nozzles, the local pressure is reduced due to the increase in flow rate, and the position of the negative pressure area and the process of the induced effect are marked, thereby showing how the oil suction pipe drives the fuel into the oil storage tank. The function and structure of the induced pump assembly described in Figure 9 are described as follows: The induced pump assembly is an important component of the fuel pump assembly of the present invention. Its core function is to achieve the induced fuel, diversion and pressure increase through the coordinated action of the nozzle, tee and top cover to ensure the stability of the fuel supply. Even if the fuel level in the fuel tank is offset or the fuel demand changes drastically, the induced pump assembly can maintain a continuous supply of fuel to avoid interruption of fuel supply. The specific functions and structures are as follows:

[0028] Nozzle: The nozzle and the top cover are welded by hot plate to form an integral structure, which is responsible for the diversion of fuel and ensures that the fuel can be delivered to the target components quickly and efficiently.

[0029] Tee: The tee is also welded to the top cover through a hot plate and is used to merge the fuel oil circuit. Through two nozzles with a diameter of 0.5mm, the high-speed injection of fuel forms a regional negative pressure inside the tee (according to the Bernoulli principle, high-speed flow of fuel causes local pressure reduction). This negative pressure drives the fuel to be sucked from the fuel tank into the oil storage barrel through the suction pipe through the injection effect ('injection effect': refers to the negative pressure phenomenon caused by the reduction of local pressure when the fuel is injected through a small-caliber high-speed injection. This effect can introduce the fuel in the fuel tank into the oil storage barrel through the suction pipe. This process includes the siphon effect), ensuring the continuity and stability of the fuel supply.

[0030] Top cover: The top cover not only provides a carrier for the nozzle and tee, but also plays a role in enhancing the overall structural stability of the component, providing reliable support for the operation of the fuel pump under complex working conditions.

[0031] To meet the needs of different vehicles or equipment, the ejector pump assembly is designed with the following adjustability:

[0032] Size: Depending on the tank capacity and oil line length, the overall size of the assembly can be flexibly adjusted to ensure optimal fit and performance.

[0033] Material: Nozzles and tees can be made of high-strength, corrosion-resistant materials to adapt to high temperature, high pressure or special fuel operating environments.

[0034] Internal structure: The nozzle diameter or the diversion angle of the tee can be optimized according to actual needs to improve the fuel flow efficiency and adaptability.

[0035] By optimizing the design of the function and structure of the ejector pump assembly and combining the flexible adjustment capability in terms of size, material and structural parameters, the present invention can be widely applied to different types of vehicles and fuel supply systems, providing strong technical support for fuel stability under complex working conditions.

[0036] By optimizing the design of the function and structure of the ejector pump assembly and combining the flexible adjustment capability in terms of size, material and structural parameters, the present invention can be widely applied to different types of vehicles and fuel supply systems, providing strong technical support for fuel stability under complex working conditions. DETAILED DESCRIPTION

[0037] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the present application, terms related to spatial directions, such as front, rear, top, bottom, left and right, refer to directions that are generally understood by a driver sitting in a vehicle in a normal riding posture.

[0039] Each embodiment of the present technology has at least one of the above objectives and / or aspects, but not necessarily all of them. It should be understood that although some aspects of the present technology are proposed to address deficiencies in the prior art, they may not fully meet this objective, or meet other objectives not specifically listed herein.

[0040] Other and / or alternative features, aspects, and advantages of embodiments of the present technology will become apparent from the following description, drawings, and appended claims.

[0041] To better understand the present technology and other aspects and further features thereof, please refer to the following description, which should be used in conjunction with the accompanying drawings, and the embodiments described with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0042] The following describes an embodiment of the present invention based on its overall structure.

[0043] See also Figure 1, an oil pump assembly, including a pressure regulator 2, characterized in that the pressure regulator 2 is located in a flange 20, a pressure valve cover 3 is arranged below the pressure regulator 2, and part of the fuel in the oil circuit is transported back to the oil storage barrel 13 through a bellows 5, and the functions of the pressure regulator 2 are as follows: when the fuel is transported to the pressure valve cover 3 and the pressure regulator 2 through the bellows 5, the pressure regulator 2 senses the actual fuel pressure in the bellows 5, and when the pressure regulator 2 detects that the pressure in the bellows 5 exceeds the set threshold, the pressure regulator 2 releases the excess fuel through the internal adjustment mechanism. The following is an explanation of the adjustment mechanism inside the pressure regulator 2: a return valve is arranged inside the pressure regulator 2, and when the pressure is too high, the return valve will open and guide the excess fuel back to the fuel tank or the inlet of the pump core 11. This can prevent the fuel pressure from being too high, thereby protecting the pump core 11 and the injector. When the engine load increases and the fuel demand increases, the pressure regulator 2 will appropriately adjust the opening of the return valve to ensure that the fuel supply pressure can meet the needs of the engine.

[0044] The flange 20 is fixed by a structure of a latch 19 and a retaining ring 1, and a torsion spring 17 is arranged outside the latch 19, which can prevent the fuel pump assembly from loosening and stabilize the flange while ensuring the maximum swing angle. The on / off reflux ESD module on the pressure regulator 2 is connected to the clamping ring 4 and is grounded through a brass hose design to eliminate the charge in the component. A pressure valve cover is arranged under the pressure regulator 2, and the pressure valve cover is connected to the bellows 5.

[0045] The torsion spring 17 connection design adopted in the present invention has significant technical advantages, especially in terms of shock absorption, impact resistance and adaptability to complex movements. The torsion spring 17 can efficiently absorb and alleviate the vibration and impact force generated during the vehicle's driving, preventing these forces from directly acting on the key components of the fuel pump assembly, thereby effectively extending the service life of the equipment. Its elastic properties allow the torsion spring 17 to automatically adjust the relative position of the connecting parts under complex working conditions, flexibly adapt to the multi-directional movement inside the fuel tank, and further improve the stability and reliability of the fuel pump assembly. This design provides a strong guarantee for the smooth operation of the vehicle in complex terrain or extreme environments.

[0046] The fuel transport pipelines in the fuel pump assembly are all designed with bellows structures ('bellows' refers to flexible pipes used to connect various components, which have the functions of shock absorption, impact resistance and displacement compensation.). The design of the bellows can effectively absorb and compensate for axial, radial and angular displacements in the pipeline system, thereby preventing equipment damage or pipeline leakage caused by displacement. At the same time, it can effectively reduce mechanical vibration and impact, and reduce vibration transmission in the fuel pump assembly. This helps to reduce the working noise of the fuel pump assembly, extend the life of the equipment, and improve the overall stability and reliability of the system. The design of the bellows can provide good sealing performance. While effectively preventing the leakage of fuel, it can also form a tight seal at the connection to prevent the medium from leaking through the interface. It is particularly suitable for sealing requirements in high-pressure or high-temperature environments. Its flexible characteristics make it easier to adapt to various layouts and joint positions in the pipeline system during installation. The bellows are designed with the ability to bend and stretch repeatedly in mind. Its materials and structures can withstand multiple cyclic loads and have good fatigue tolerance.

[0047] The bellows 5 passes through the ejector pump assembly 9 below. The ejector pump assembly 9 includes a nozzle (2), a tee (3) and a top cover (1). The top cover (1) is used to enhance the stability of the assembly. The tee (3) can realize the synchronous diversion when the fuel flows out of the pump core in the oil storage barrel 13, and the nozzle (2) ejects the pumped fuel to the oil outlet pipe and further increases the pressure during fuel transportation. The ports are in opposite directions. When the oil level in the fuel tank deviates, that is, when the fuel in the fuel tank is not exhausted, at least one front suction pipe 22 or at least one rear suction pipe 23 is always inserted below the oil level to ensure the supply of fuel. Further, the suction pipe can be divided into a front suction pipe 22 and a rear suction pipe 23. When the vehicle is in a slope condition for a long time, at least one front suction pipe 22 or at least one rear suction pipe 23 of the fuel pump assembly always has one end below the liquid level to ensure that the fuel pump can continue to suck fuel from the fuel tank until the fuel in the fuel tank is exhausted, thereby improving the driving stability of the vehicle on the slope. At the same time, the design of the front suction pipe 22 and the rear suction pipe 23 of the fuel pump assembly can effectively avoid the problem of dead angle of oil suction in the front suction pipe 22 or the rear suction pipe 23 due to the irregular structure of the fuel tank, so that the fuel pump 1 can fully and continuously absorb the fuel in the fuel tank when there is fuel in the fuel tank. Figure 8 As shown, when the fuel in the fuel pump assembly is being transported from the pump core 11 to the fuel storage tank 13, the fuel flows through the oil path in the ejector pump as shown in FIG. Figure 8 As shown, while the pump core 11 outputs the fuel to the jet pump, the output of the fuel from the jet pump causes a certain negative pressure in the space inside the jet pump, thereby driving the suction pipe connected to the jet pump to suck oil from the fuel tank, so that when there is fuel in the fuel tank, there is also fuel in the fuel storage barrel 13 to supply the pump core 11 with fuel to the engine to maintain the continuous operation of the snowmobile.

[0048] A pump core 11 is provided below the priming pump assembly 9, and an umbrella valve 12 is provided below the pump core 11. The umbrella valve 12 is connected to the oil storage barrel 13 to allow the fuel in the fuel tank to enter the oil storage barrel. The fuel pump assembly also includes at least one front oil suction pipe 22 and at least one rear oil suction pipe 23. One end of the front oil suction pipe 22 and the rear oil suction pipe 23 is provided with a coarse filter pipe 21, which effectively ensures the cleanliness of the fuel inside the fuel pump assembly and prevents impurities from entering the fuel pump assembly and affecting its operation. The other ends of the front oil suction pipe 22 and the rear oil suction pipe 23 are placed in the top cover (1), forming a connecting structure with the bellows 6 and the bellows 7, and the front oil suction pipe 22 and the rear oil suction pipe 23 are distributed at the front and rear ends of the entire oil pump. The number of oil suction pipes is preferably two, and the oil suction pipe and the oil surface contact end are bidirectionally arranged to ensure that one end can always be inserted below the fuel liquid level in the fuel tank, ensuring that when there is fuel in the fuel tank, no empty suction will occur due to changes in the position of the fuel tank.

[0049] Furthermore, an oil level component 14 and a resistance plug wire (15) are arranged on the outside of the oil storage barrel 13. The oil level component 14 is responsible for detecting the oil level information and outputting the oil level information to other devices connected to the external plug through the circuit.

[0050] Furthermore, the ejector pump assembly 9 comprises a nozzle (2), a tee (3) and a top cover (1); the top cover (1) is connected to the nozzle (2) via a bellows 6 and a bellows 7; and the ejector pump assembly 9 is connected to a pump core 11 below.

[0051] Further, a power cord 8 is provided at the same time, one end of the power cord 8 is connected to the clamp ring 4, and the other end is connected to the oil level assembly 14. The clamp ring 4 provided here can effectively prevent the power cord 8 from being loosened.

[0052] Further, as attached Figure 7 As shown in the figure, the front suction pipe in the fuel pump assembly abuts against the bottom of the front end of the fuel tank, and the rear suction pipe abuts against the bottom of the rear end of the fuel tank. With this arrangement, no matter how the fuel level in the fuel tank deviates, one end of the front suction pipe or the rear suction pipe is always inserted below the fuel level to ensure continuous fuel supply. At the same time, the front suction pipe and the rear suction pipe are in close contact with the front and rear ends of the fuel tank, respectively, effectively avoiding the problem of dead angle of oil suction caused by irregular tank structure or fuel tilt, thereby greatly improving the stability of fuel supply and the reliability of vehicle operation.

[0053] Further, as attached Fig.16 As shown, the ends of the front oil suction pipe 22 and the rear oil suction pipe 23 in the fuel pump assembly both include a coarse filter 21 of the illustrated structure. The grid design of the coarse filter pipe structure at the ends of the front oil suction pipe 22 and the rear oil suction pipe 23 can not only effectively prevent impurities from entering the fuel pump assembly, but also continue to draw fuel from the fuel tank when the fuel level is lower than the center line of the oil suction pipe, thereby significantly improving the utilization efficiency of the fuel.

[0054] The oil tank mentioned in the present application is foot-shaped as a whole, and its bottom is flat. The ends of the front oil suction pipe 22 and the rear oil suction pipe 23 are distributed at the front and rear ends of the oil tank. The oil tank (front and rear oil suction pipe arrangement) solves the problem of dead angles in oil suction in the front oil suction pipe 22 and the rear oil suction pipe 23, so that the pump core can fully and continuously absorb the fuel in the oil tank when there is fuel in the oil tank.

[0055] The fuel pump assembly of the present invention can operate stably and continuously in the fuel temperature range of -40℃ to 40℃ and the air ambient temperature range of -40℃ to 60℃, and can be stored in the environment of -40℃ to 85℃. Its careful material selection and design ensure excellent sealing and reliable fuel supply performance under extreme temperature conditions. In addition, the fuel pump assembly can work normally in the altitude range of 0 to 4000 meters.

[0056] The fuel pump assembly of the present invention is not limited to the specific structure and layout of the embodiment described above, and can be designed in a variety of variations according to actual needs. For example, the number of oil suction pipes can be appropriately increased or decreased according to the shape of the fuel tank and the use conditions of the vehicle to adapt to complex fuel tank structures or extreme driving environments. The end of the oil suction pipe can be a flexible hose or a shaped pipe with a memory function to further improve its adaptability to the bottom of the fuel tank.

[0057] The present invention can also be applied to the fuel supply systems of other fuel-driven equipment, such as off-road motorcycles, all-terrain vehicles (ATVs), or other fuel-driven equipment that needs to operate under complex working conditions, thereby expanding its scope of application.

[0058] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A fuel pump assembly, comprising a flange, a pressure regulator, an ejector pump assembly, a pump core, a coarse filter, an oil storage tank, a liquid level sensor, a plurality of bellows and an oil suction pipe, characterized in that: The pump core, the ejector pump assembly, and the flange sequentially form an oil circuit from the pump core to the flange. The pump core has two oil outlet pipes, one of which is connected to the flange through a bellows to deliver the fuel to the engine, and the other is connected to the ejector pump assembly through a bellows to deliver the fuel in the fuel tank to the oil storage barrel. A pressure regulator is provided in the flange, and when the pressure in the oil circuit is too high, the fuel flows into the oil storage barrel through the pressure regulator. The ejector pump assembly is provided with at least two oil suction pipes at the front and rear ends, and a coarse filter pipe is provided at the end of the oil suction pipe. The ends of the oil suction pipe are respectively placed at the bottom of the front and rear ends of the fuel tank.

2. The fuel pump assembly according to claim 1, characterized in that: The invention also comprises an ejector pump assembly connected to the pump core through a bellows. The ejector pump assembly has at least two oil inlets and at least two oil outlets, and the oil outlets are in the oil storage barrel. At least two oil suction pipes are installed on the oil suction port.

3. The fuel pump assembly according to claim 2, characterized in that: The two oil suction pipes are arranged in a front and rear direction, and the ends thereof are in contact with the bottom of the front and rear ends of the oil tank. The front oil suction pipe is shorter, and the rear oil suction pipe is longer.

4. The fuel pump assembly according to claim 3, characterized in that: The rear oil suction pipe is a shaped pipe, and its end is designed to be bent downward.

5. The fuel pump assembly according to claim 3, characterized in that: The ends of the front and rear oil suction pipes are both provided with coarse filter pipes.

6. The fuel pump assembly according to claim 1, characterized in that: The ejector pump assembly is connected to the flange via a torsion spring.

7. The fuel pump assembly according to any one of claims 1 to 6, characterized in that: The front oil suction pipe abuts against the bottom of the front end of the fuel tank, and the rear oil suction pipe abuts against the bottom of the rear end of the fuel tank, thereby ensuring that when the fuel level in the fuel tank of the fuel pump assembly deviates, one end of the front oil suction pipe or the rear oil suction pipe is always located below the liquid level, thereby ensuring continuous supply of fuel.

8. The fuel pump assembly according to any one of claims 1 to 7, characterized in that: The nozzle element in the ejector pump assembly has a diameter of 0.3mm to 1.0mm and is made of brass material to adapt to the viscosity of different fuels and the use environment.

9. The fuel pump assembly according to any one of claims 1 to 8, characterized in that: The coarse filter tube at the end of the suction pipe adopts a grid structure design, which can not only effectively block impurities from entering the fuel pump assembly, but also continue to draw fuel from the fuel tank when the fuel level is lower than the center line of the suction pipe, thereby significantly improving the utilization efficiency of fuel.

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