2020–2026 GM 3.0L Duramax Diesel Fuel Cap

Looks great. Fits great. Cool looking metallic green. The website picture does not do it justice.

I purchased this fuel cap for 3 reasons: 1) To help keep water and dirt out of the fuel tank, 2) As an extra preventative measure to make me stop and think before accidentally putting gasoline or DEF in my diesel tank, and 3) Because it looks cool. I like the fact that it is magnetic EXCEPT the fuel door is plastic. I wasn’t about to stick it to the side of my truck out of fear of scratching it, so I ordered a little magnetic adhesive circle sticker off Amazon and stuck it to the inside of my fuel door to stow the cap while refueling.

I love that PPE made this and priced it reasonably. Once its on, nice fit btw, it looks like it was meant to be there. Keeps the dirt and dust out of the gas entry tube and just looks cool even though no one sees it! And one more benefit…Maybe it will also slow down someone from putting def into the gas tank.

I am happy to report that my first purchase for my new ZR2 was this beautiful machined anodized fuel cap and I can’t be happier. Excellent pricing and even better customer service, you can’t go wrong with this item.

Amazing quality, fits perfectly and does as intended.

Didn’t like the fact the fuel filler port didn’t have a cap especially when getting g water into the diesel would be Very detrimental to a diesel engine. Glad PPE had this fuel cap. Fit perfect. Design is nice. I Added a metal plate to the inside of the fuel door so the cap can be attached to the inside of the door instead of the body. Thanks PPE!

Exactly what I was looking for, keeps I water contaminants out of the filler neck, from day to day driver or the water from car wash. Only down side is now have this beautiful machined aluminum fuel cap next to an ugly blue DEF cap wish they made a DEF cap to match the quality. Would buy again!!

Fits nicely, looks cool, and peace of mind keeping dirt and water out.

Excellent fit and finish on this fuel cap. It does exactly what it says in the description, and at a great price. It is especially useful if you spend any time off road where dirt and mud might end up behind your fuel door, and also makes washing easier.

Looks great and has a magnet to stick onto the fuel door. I had tried another cap upgrade, but this 1 is much nicer.

Working in the oilfields of West Texas has made dirt and dust accumulate on the factory flap. I knew I was scraping dirt into my diesel tank every time I fuel up. With the gasket it keeps the dirt out.

Great product, fits just right and well made

I absolutely love the cap. It not only complements the overall look but also ensures that no particles fall in. The only suggestion I have is to include a string so that I don’t forget it at the gas station. Overall, it’s an awesome product!

Exactly what I needed. This will keep more dirt out of the fuel system. Needed to add a piece of metal to the fuel door for storage while filling.

Ordered the fuel tank cap and when it arrived I put it on. Now I feel like I'm protected from trash and water getting into my fuel tank.

Love it ! Now when washing my truck i can open the fuel door and wash inside

Simple & as advertised. Keeps dust & other contaminants out of the fuel neck.

It has a great fit and finish. Looks great. I would highly recommend this product to anyone.

Great product. Adds security from accidental spills of DEF or other liquids from getting into the tank.

Fit perfectly. A must have to keep water and debris out of fuel. Can't believe it doesn't come with one from the factory

Fit was perfect, fast shipping! Will be looking to this company for future needs!

Got this for my 2026 Sierra 3.0 liter. Fit is secure. This is a solid piece of aluminum. It feels hefty and durable. Satisfied with purchase.

I don’t know why gm does not have a fuel cap on a system that can kill a motor if miss fueled but there it is. Glad PPE makes one and it works fine thanks.

I liked the weight of the Billit diesel fuel cap. It fit snuggly in my Chevy Silverware 1500 3.0 Duramax.

The RAM open neck design is a magnet for crud, the mortal enemy of your fuel system. This is a dead simple, completely effective cure for a **** OE design. The cost is reasonable, shipped quickly, and a perfect fit. Stop wondering, just buy it.

Nice, snug fit on my Sierra 1500 w/ the BabyMax. Good extra piece of mind, and well-made out of metal instead of 3D printed plastic like others. The magnet is useful, IF you have magnetic metal around your gas cap.