Fuel filter 4MO127434H suitable for Volkswagen Audi

Function

Protecting engine components: It can filter out harmful particles and water from the engine fuel system, preventing iron oxide, dust, and other solid debris from entering, protecting the oil pump, oil nozzle, cylinder liner, piston rings, and other components, reducing mechanical wear, and preventing performance degradation due to clogging.

Ensuring fuel purity: It makes the fuel entering the engine for combustion cleaner, allowing for more complete combustion, reducing carbon deposits, improving engine power output and stability, and also helping to reduce harmful substances in exhaust emissions.

Working principle

Gasoline filter: In a carburetor-type gasoline engine, the gasoline output from the fuel pump enters the housing via the fuel pipe, is filtered through the filter element, enters the filter element cavity, and then is delivered to the carburetor via the outlet pipe. In an electronic fuel injection engine, gasoline is drawn from the fuel tank by the fuel pump, pressurized to approximately 0.3 MPa, and then passes through the filter to remove impurities and water before being sent to the fuel distribution pipe, then injected into the intake pipe by the injector; excess fuel is returned to the fuel tank via the return pipe.

Diesel filter: Diesel fuel first enters the diesel water separator, where water is separated by sedimentation and filtration, and then passes through the diesel fine filter to remove small particles, providing clean diesel fuel to the engine.

Structural composition

Housing: Usually made of aluminum alloy, iron, or plastic, it protects the internal filter element and other components; the material and shape of the housing vary depending on the type of fuel filter.

Filter element: This is the core component of the fuel filter, mainly used to filter impurities from the fuel; common filter element materials include paper, chemical fiber, ceramic, and stainless steel; filter elements of different materials differ in filtration efficiency and service life.

Inlet and outlet: These are used to connect the fuel lines, allowing fuel to smoothly enter the filter for filtration and delivering the filtered fuel to the engine or other components.

Other components: These may include sealing gaskets, springs, dust covers, and settling cups. Sealing gaskets prevent fuel leakage; springs secure the filter element; dust covers prevent dust and other impurities from entering the filter; settling cups collect water and heavier impurities from the fuel.