On carbureted models, the fuel filter is located in the mechanical fuel pump. There are three types of fuel pumps. Two types have a single screw holding a cover on the top of the pump. To remove the filter screen, undo the screw and carefully lift the cover off the pump. Remove the cover gasket and filter screen taking careful note of the position of the screen. Blow the screen out with air and replace the screen and cover using a new gasket if necessary.
The third type of fuel pump has four screws securing the top cover to the pump. This type of pump has a large plug with a hexagonal head. Remove this plug and washer (gasket) to gain access to the cylindrical filter screen located beneath the plug. Blow the screen out with air and replace it in its bore with the open end facing into the pump. Install the washer and plug. Do not overtighten the plug.
Fuel injected engines have an electric fuel pump located near the front axle on all models except the Type 2, in which the fuel pump is located near the fuel tank. This type of engine has an in-line fuel filter located atop the fuel pump in the suction line for the fuel pump. The suction line is the line running from the gas tank to the "S" connection at the fuel pump. To change the fuel filter, clamp the lines shut, then release the retaining pin and bracket, disconnect the gas lines from either end of the filter and insert a new filter. Filter should be installed with arrow (if any) pointing in the direction of fuel flow. This type of filter cannot be cleaned. VW recommends replacement at 12,000 mile intervals. A small speck of dirt entering a fuel injector may completely block the flow of fuel, necessitating disassembly of the injection system.