How to Install a Diesel Fuel Filter

The diesel fuel filter exists to remove any solid particles of contaminating materials which end up getting lodged inside the moving parts of the engine. Without the filter, these parts will end up creating additional wear and tear to the engine. Compared to gasoline engines, a diesel fuel filter is considerably larger, as it has a lot more material to filter out. You will find the fuel filter located in the fuel line system, and to replace it, you will need to remove the old one and remove any old dirt before installing the new one.

Tools and Materials Needed:

  • Diesel fuel filter
  • Set of wrenches
  • Rags
  • Screwdriver

Step 1  - Open the Engine Bay and Find the Filter

To get to the fuel filter, you will need to access the fuel delivery system and the hosing around it. To get to this, open up the engine bay of your car and find the diesel fuel filter. The exact location depends entirely on your specific car, so you may want to refer to instructions for your specific model. You should find that the diesel fuel filter is located between the intake manifold and the gas tank itself. The filter is rectangular, and it will have a tube leading through one end and coming out the other. It will likely be secured on a mounting bracket or with a retaining strap.

Step 2 – Remove the Old Fuel Filter

You will find that at each end, the filter has a hose, and they both need to be detached using the wrench or screwdriver to remove the fittings. Some excess diesel will pour from each end, so try to catch this in a container or a rag to prevent making a mess. You will need to remove the old fuel filter and discard it appropriately. In some cases, it can also be returned to an auto parts store for proper disposal. The old filter will contain contaminants which are harmful to the environment and people’s safety, so there are laws enforced to ensure proper disposal. Check with your local rules for further guidelines.

Step 3 – Install the New Filter

Secure the new filter into the mounting bracket or the retaining strap, and return the connections that you removed before. Simply reverse the steps that you took to remove the old filter. Be sure to tighten all of the fittings and secure both ends of the hose on to the fuel filter in the same manner that they were before. Clean the surrounding area and get rid of any remaining diesel which has built up.

Step 4 – Finish Up

Finally, close the engine compartment, but do not start the car just yet. You will need to refill the lines with fuel, and the best way to do this is simply to push down on the accelerator pedal before starting the engine. Do not have the engine started without fuel being present in the lines, as this can cause damage.