Fuel Filter: Description and Operation

Fuel Gage Sending Unit:

Purpose:
This filter prevents dirt and water from entering into the fuel line unless it becomes completely submerged in water.

Operation:
The filter is self-cleaning and normally requires no maintenance. Fuel stoppage at this point indicates that the fuel tank contains an abnormal amount of sediment or water and should be thoroughly cleaned.

Diesel engine vehicles have a check valve that will permit fuel to pass if the tank filter becomes plugged with paraffin during cold weather operation.

When the plugging occurs, the last four gallons of fuel will not be used due to the location of the check valve. Therefore, it is important to keep the fuel tank above the 1/4 mark at temperatures below -6°C (-20°F) when using number two diesel fuel.

Location:
A woven plastic filter is located on the lower end of the fuel pickup tube in the fuel tank.