How to Change the Fuel Filter in a Dodge Cummins Diesel Truck

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Changing the fuel filter on a diesel can be a dirty job--diesel fuel makes a mess of everything--but someone has to do it. You can learn how to change your fuel filter in a Dodge Cummins diesel truck without making a dirty mess of your driveway.

Things You'll Need

  • Fuel filter
  • 1 1/8 socket and ratchet
  • Drain pan
  • Clean rags
  • 1 foot section 1/2-inch PVC pipe
  • Set the parking brake. Open the hood and locate the fuel filter. The filter is located on the driver's side, upper rear of the engine. Wipe down the filter housing area if it's dirty.

  • Position the drain pan under the fuel filter drain hose and open the fuel filter drain valve so fuel begins to drain.

  • Remove the filter housing cover using the large socket. Raise the housing lid straight up to remove the old fuel filter from the canister. More fuel will drain to the pan when the lid is removed. Inspect the fuel canister for debris or damage.

  • Remove the old filter and O-ring from the lid. Lubricate the new O-ring and install it on the lid. Install the new fuel filter to the lid, making sure the hole faces downward. Reinstall the lid with the filter attached, being careful not to over tighten, as the lid will crack.

  • Close the filter drain valve and remove the drain pan from under the truck. Bump the engine with the starter to prime the fuel filter. Some trucks will self prime when the key is turned to the "on" position. Start the engine and check for leaks.

Tips & Warnings

  • The factory fuel drain hose is short, causing fuel to drip over the differential and frame. Extend the hose so fuel will drain directly into the drain pan. Cut a 1 foot section of 1/2-inch PVC pipe and slide it over the end of the drain tube. The fuel will drain into the drain pan with no mess.
  • Always wear safety glasses and use caution when working around vehicles.

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  • Photo Credit fuel valve image by Luis Bras from Fotolia.com
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