Duramax Fuel Filter Change (2017+ 6.6L L5P)
A Duramax fuel filter change is a necessary part of routine maintenance. It should be done when the trucks maintenance indicator tells you at a minimum and it is not uncommon to get a bad batch of diesel and have to do it sooner. This guide is specific to the 2017, 2018, 2019, 2020, and 2021 6.6L Duramax (L5P) engines found in Chevrolet Silverado and GMC Sierra 2500 and 3500 trucks. To complete an oil change on this engine, follow this guide.
Tools Needed:
- 36mm socket and ratchet
- Pick to remove O rings
- Drain pan
Parts needed:
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- Fuel Filter – ACDelco TP1015 fuel filter with seals
2017+ Duramax Fuel Filter Change Procedure:
- Park truck on a level parking spot and verify the the key or ignition is in the off position
- Locate the fuel filter housing between the frame rails in front of the fuel tank
- Place drain pan below housing and loosen the canister using the 36mm socket and ratchet
- Let the diesel drain into the pan before attempting to remove it
- Once all excess diesel has drained, removed canister
- Inspect canister for any debris and clean out if anything is found
- Remove and replace large o ring below threads on canister
- Remove and replace small o ring on shaft on fuel filter housing
- Install new fuel filter and canister onto fuel filter housing
- Cycle the ignition to the On position without starting truck to prime the fuel system
- Reset the fuel filter maintenance reminder by going to the Fuel filter maintenance screen on the dash and following the reset prompts
