The fuel filter in your Volkswagen Passat screens out dirt and rust particles from the fuel. Some experts recommend you replace the fuel filter every 30,000 to 40,000 miles to keep your vehicle in good running order. Follow the instructions to replace the fuel filter in a Volkswagen Passat in under 45 minutes.
Read the lid on the fuel pump fuse box to know whether you should remove the relay or the fuel pump fuse in order to stop the fuel pump from running. Start the engine and let it run until it stalls. Disconnect the negative battery cable.
Locate the the control pressure regulator and loosen the fuel line on it. As you loosen it, wrap a clean shop towel around the connection to catch any fuel leakage. Before you take out the fuel filter, which is mounted under the vehicle below the fuel tank, note the direction the arrow points on the filter.
Disconnect the fuel lines and remove the filter. Replace it with the new filter and attach the fuel lines. Be sure you do not mix up the fuel supply and return lines, as this will damage your fuel system.
Check your owner's manual to see if your Volkswagon Jetta also has a filter in the engine compartment near the fuel distributor. If so, disconnect the fuel lines to and from the filter. Unscrew the filter bracket then take out the filter. Put the new filter in the bracket and secure the bracket in its place in the vehicle.
Reconnect the fuel lines, connect the negative battery cable, and then replace the relay or the fuses. When you start the engine of your Volkswagon Passat, check for leaks, and repair if necessary.
You must relieve the fuel system pressure before servicing your vehicle. Be sure to follow the recommended procedure, so that pressurized fuel does not ignite or cause injury. Before starting your Passat, wipe up any fuel that may have spilled on the vehicle during filter replacement.