How To Replace The Diesel Fuel Filter On A Pick-Up Truck

14 January 2015
 Categories: , Blog


Diesel fuel filters should be replaced periodically to prevent them from becoming clogged with contaminants coming from your fuel tank. A clogged fuel filter will allow contaminants to get into your fuel injector system and can cause a lot of damage. A clogged fuel filter also puts unneeded wear and tear on your fuel pump and may eventually cause the pump to fail. Here is how you can replace your fuel filter on a diesel engine.

What You Will Need:

  • New Fuel Filter
  • Two O-Rings (one large and one small)
  • Filter Wrench
  • Flathead Screwdriver

Removing Old Filter

The fuel filter is screwed into a bracket located along the fuel line inside the engine compartment. You can determine the exact location by referencing your service manual. Once the fuel filter is located, unplug the water sensor located on the bottom of the filter from the fuel line. You may have to use a filter wrench to unscrew the filter from the bracket. The filter should be full, so exercise caution pulling it out if you don't want to get diesel fuel all over the place. Dispose of the diesel fuel in the filter by pouring it back into the fuel tank. Unscrew the water sensor from the bottom of the old filter and set it aside.

Put in New Filter

Put the large O-Ring (this should be in the box with the small O-Ring and filter) into the top end of the new filter. The small O-Ring is placed on the water sensor. Screw the water sensor into the bottom of the new filter. Then screw the new filter into the bracket on the fuel line. Reconnect the water sensor plug to the fuel line.

Fill the Filter with Fuel

On the top side of the bracket are a small hand-like pump and a breather valve. Open the breather valve with a small flathead screwdriver. You will need to use the little pump to fill up the filter with fuel. Pump until fuel comes out of the breather valve. Close breather valve.

Start Vehicle

You can test the new filter simply by starting your engine and letting it run for a few minutes. You may want to check the filter and connections to make sure there aren't any leaks.

Properly maintaining your diesel engine involves making sure the fuel filter is clear of clogs and is working well. A good rule of thumb is to change your fuel filter every time you change your oil. For more information, contact a shop like Williams Oil Filter Service Co.