Fuel Filter Water Drain System Using Pressure Differential
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing manual and solenoid-based water drain systems for fuel filters in vehicles require operator intervention, are prone to human error, and can lead to water re-entering the fuel system, causing engine damage, and often necessitate additional pressurization, increasing costs and complexity.
Innovation Solution
A liquid drain system with a collection vessel and check valves that automatically drains water from the fuel filter by using the pressure of the same liquid to maintain closed configurations and switch to open when pressure differential reduces, allowing water to drain and be replaced by less dense fuel, integrated with a hydrocarbon dosing system for efficient disposal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual water drain systems are used, then the system is simple and cost-effective, but operator intervention is required and water may re-enter the fuel system causing engine damage
Solution Approach 1:
The drain system automatically drains water from the fuel filter using the existing fuel pump pressure without requiring operator intervention. The system self-regulates by using check valves that open when pressure differential reduces, allowing water to drain and be replaced by less dense fuel, eliminating the need for manual operation while preventing water re-entry into the fuel system
Solution Approach 2:
The system uses pressure differential feedback to control the check valves. When the pressure differential across the drain system reduces, the check valves automatically switch to open configuration, initiating water drainage. This feedback mechanism ensures reliable automatic operation without requiring additional sensors or complex control systems
2Extent of automation
If solenoid activated water drain valves are used, then automatic operation is achieved, but additional pressurization equipment is required increasing cost and complexity
Solution Approach 1:
The system utilizes the existing fuel pump pressure to drive water drainage without requiring additional electrical pumps or pressurization equipment. The check valves are designed to automatically respond to pressure differential changes, making the system self-regulating and eliminating the need for solenoid actuators or complex pressurization systems
Solution Approach 2:
The check valves act as passive intermediaries that mediate between the fuel pump pressure and the water drainage process. They automatically open when pressure differential reduces and close when pressure is applied, providing automatic control without requiring active solenoid valves or additional pressurization equipment
3Ease of manufacture
If water is drained on the pressure side, then the drain valve requires no additional pressurisation, but water separation is more difficult and the fuel filter and water drain are more expensive
Solution Approach 1:
The collection vessel is segmented into a first chamber arranged to receive water from the fuel filter and a second chamber, with check valves positioned between them. This segmentation allows the system to operate on the suction side while maintaining simple drain valve design, as the pressure differential naturally controls valve operation without requiring complex water separation mechanisms
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Eliminates the need for manual operation, reduces the risk of water re-entering the fuel system, and integrates with the hydrocarbon dosing system for efficient and cost-effective disposal, allowing the water drain system to be smaller and more versatile in placement within the engine bay.
Implementation Method 1
the valves being arranged to be in the closed configuration when the pressure in the second chamber exceeds that in the first chamber by more than a first predetermined amount; and wherein when in a second operational mode the first inlet is arranged to stop supplying the second liquid such that the pressure in the second chamber reduces relative to the first chamber allowing the valves to return to the open configuration
Implementation Method 2
allowing the valves to return to the open configuration such that the first liquid passes from the first chamber to the second chamber through the lower valve, and the second liquid passes from the second chamber to the first chamber through the higher valve
Implementation Method 3
when the drain system is in an upright position in which the first chamber is above the second chamber
Data Source
AI summary
A drain system and method for draining a first liquid, including a collection vessel having a first chamber arranged to receive the first liquid, a second chamber, and higher and lower valves positioned between the first and second chambers. When the valves are open, liquids can pass between the chambers. When the pressure in the second chamber exceeds that in the first chamber by more than a first predetermined amount, the valves are closed. A first outlet to the second chamber allows liquids to flow from the second chamber. In a first mode, the first inlet supplies a second liquid at a pressure higher than that of the first liquid in the first chamber such that the valves are closed. In a second mode, the first inlet stops supplying the second liquid such that the pressure in the second chamber reduces relative to the first chamber allowing the valves open.