Fuel Filter: Description and Operation

Fuel Filter Cross Section:

IN-LINE FILTER

Purpose
The inline fuel filter prevents dirt from entering the injection unit.

Operation
The fuel injection system uses an in-line filter. The filter is located on the left side of the vehicle in the fuel feed line. In-line filters use an O-ring where the fuel lines thread into the fuel filter. If an element should ever become plugged, the engine will stop running. An engine failure caused by a plugged filter element may be preceded by a hesitation or sluggish operation.

Fig. 1 In-tank Electric Fuel Pump (Models Equipped w/TBI):

IN-TANK FILTER

Purpose
The In-tank fuel filter prevents dirt from entering the fuel line and also stops water from entering the fuel system, unless the filter becomes completely submerged in water.

Operation
A woven plastic filter is located on the lower end of the fuel pick-up pipe in the fuel tank. This filter is self-cleaning and normally requires no maintenance. Fuel blockage at this point indicates that the fuel tank contains an abnormal amount of sediment or water. Therefore, the fuel tank should be removed and thoroughly cleaned and the tank filter replaced.