Note: Please ensure your fuel filler neck is green plastic with no internal ribbing before ordering.
The capless fueling system on 4th Gen RAM trucks has a major Achilles heel: it leaves your fuel tank vulnerable to moisture, dirt, and debris. We’ve solved this issue with our lineup of Dirty Billet Fuel Caps. Designed specifically for the 2013-2018 Cummins and 2014-2018 EcoDiesel, both of our cap options feature a precision O-ring seal and an integrated 20lb pull-strength magnet to keep the cap secured to your fuel door hinge while you fill up.
Choose Your Solution:
OEM Filler Cap (A049): A straightforward, precision-machined aluminum cap that slides into your stock filler neck to keep contaminants out.
Fix Kit Cap (A036): Designed to solve the common issue of the green plastic filler neck breaking, especially in freezing temperatures. This kit uses a high-strength sleeve and split clamp system to reinforce or repair a broken neck, providing a durable interface for pump nozzles.
Why Shop Dirty?
Canadian-Made Performance: High-performing parts made in-house in our shop in West Kelowna and sourced from across North America with the highest quality standards
Born in the Shop: Our parts are engineered with real-world experience. Whether it's an OEM fix or a performance upgrade, we build what we know works. We make our parts to solve real-world problems.
Dirty Made Quality: We aren’t just designing the kits; we are installing them every day in our own shop. We use our own products every day. From the first weld to the last bolt, we build tough gear that actually fits, handles abuse, and looks the part.
Part Number: I67-FUE-A036 / I67-FUE-A049
Features
CNC machined from billet aluminum with a precision O-ring for an airtight, debris-proof seal.
Finished in a durable "Diesel Green" powder coat for easy identification and long-lasting style.
Integrated 20lb magnet allows the cap to stick to your fuel door hinge during refueling.
Fix Kit (A036) reinforces the fragile OEM plastic neck to prevent or repair cracking.
Includes
(1) Billet Machined Fuel Cap with Magnet
(1) High-Quality O-Ring Seal
(Fix Kit Only) High-Strength Reinforcement Sleeve and Split Clamp Hardware
We overengineer everything we make. It's manufactured to last and tested to prove it, and if by some strange anomaly it ever lets you down, we'll fix it, have a word with whoever built it, and come back stronger. That's the Dirty Lifetime Warranty. Click here for all the details.
Questions and Answers
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The kit fit perfectly and fixed the poor design by Ram. I never bought anything from this company before but the kit showed up fast and fit perfect so I’ll be buying more from them.
Chad P.5/5Verified
Great kit to fix a factory problem. Cheap plastic filler neck and chips and cracks over time. The aluminum pieces fit nicely over the neck (even if it’s chipped and missing portions), has another aluminum piece that that slides down the filler neck, and it’s screwed together. I used some blue loctite on the screws. Doesn’t interfere with the DEF cap either. Filler cap fits nicely and has a rubber o ring Great kit, buy one!
Jim M.5/5Verified
Other than being a tight squeeze for my fingers. Easy peazy.
Roger P.5/5
It fits snug and well. The clearance between the Def cap and the collar are very close which is fine, but if you have a stubby Allen wrench you could probably turn the collar and have more clearance. Overall it seems very sturdy and way better than the OEM plastic filler tube.
Scott S.5/5Verified
Awesome product. 10/10 recommend this to anyone, fit and finish was perfect and quick easy install. Also looks sharp!
Matthew F.5/5
Awsome product.I had it installed with In a half hour
Sylvio C.5/5Verified
No issues
Roger L.5/5Verified
So far so good. Easy to install and nice fit. Only issue I expected o-ring in the cap to be tighter in the repair sleeve when the cap is on.
Tim P.5/5Verified
Just installed it no problem hope it works good
Phyllis S.5/5Verified
Dirty Diesel's Custom LTD absolutely nailed it with their RAM Billet Fuel Filler Cap Fix Kit. The original plastic filler opening on my RAM was broken and missing pieces, but this kit provided a perfect, sturdy replacement made from high-quality materials. It was an easy, affordable fix is far better than the cost and hassle of replacing the entire filler hose. Excellent craftsmanship and real attention to detail; these guys do great work!
Mark O.5/5Verified
Great item to fix Rams poor design. Way better that the alternative repair option and way cheaper. Thank you Dirty Diesel for coming up with a quality item to make this repair. I highly recommend this part to anyone! Thanks Again.
John...
John R.5/5Verified
Quite quite happy with the Support that is provided for the fuel filler neck. Completely disappointed that the fuel cap does not seal at all.
Michael Y.3/5Verified
Very pleased! The product looks great and is SO MUCH BETTER than factory! Ram should be sponsoring you guys! Fast shipping and great customer service! I’m going to post on the Cummings page and show your work! Way to go Dirty Diesel Customs!
Marc M.5/5Verified
Quick and easy install
Kirk J.5/5Verified
Looks great, very well made and the fit was tight but just enough that you know it’s going to work, now I don’t have to stand there and hold the nozzle at a wierd angle so thank you dirty for this
Hunter W.5/5
Fit perfectly and was a fraction of the price compared to replacing the whole filler spout! Does its job perfectly and keeps the dust out!! Highly recommend this to anyone who has a broken filler spout! Even recommend it to anyone who doesn’t have a broken spout. It is metal and will prevent it from breaking. 10 outta 10 from me.
Kelly P.5/5Verified
Fit perfectly! Works like a champ!
Well manufactured, quality materials…
Stephen M.5/5Verified
The "RAM Billet Fuel Filler Cap Fix Kit" worked PERFECTLY on my 2017 RAM 3500 Cummins with the green plastic fill neck! Even-though the description on the website said 2013 - 2015 RAM Cummins. It's a little pricey but the materials appear to be of really good quality. Thank you!
Sean C.5/5
Fits great and looks better, no more worrying about breaking the fill neck even more then it was .super easy install, In and done under 5 minutes .couldn’t be happier
Mike D.5/5Verified
Nice fit. At first, had a problem filling from High Flow Semi truck pump. Nozzle fit but didn't seem to let the nozzle go all the way down. Make sure you get the coil around the nozzle tube down into the filler neck all the way. After I figured that out worked great. Nice product. Wish I had have gotten it before the cheap original plastic broke. Highly recommended for all of our trucks.
John S.5/5Verified
Super easy install. Love having the fuel fill protected now
George N.5/5Verified
Fit very good , glad to have that plastic crack taken care of!
Dean S.5/5Verified
Awesome kit. Fixes the cracked filler neck with ease. Been using it for a year now and no issues. Definitely better than stock. Highly recommended
Matti E.5/5
Easy install. Fits perfectly.
Chet B.5/5Verified
Fits great, fixed the leaky fuel neck perfectly. Can fill up to the top of the neck now without leaks.
Mark L.5/5Verified
Excellent fit. Very well built and works great. Good job Dirty Diesel!!
Keith W.5/5Verified
It was a snug tight fit worked like a charm.
Thomas H.5/5Verified
Fit perfect. Quick install. Fuel nozzle fits in it better than I thought it would. Highly recommend it even if your filler isn't cracked.the lid seals it tight.
David D.5/5Verified
Absolutely awesome repair! Its the simple things in life
Eric E.5/5Verified
Fits perfect!
Tyler P.5/5Verified
👍👍
Corey T.5/5Verified
Nothing agaist Dirty Diesel, low score for Shop and Shop order tracking. There isnt any!
Matthew W.1/5Verified
Great design.
Curtis B.5/5Verified
Amazing!
Michael B.5/5Verified
Very well made. Easy to install. Looks 100% better than stock setup.
Delmar L.5/5Verified
Fits great way way way overpriced
Jim M.5/5Verified
Fixed the issue with having to replace the whole fill tube.
Anthony S.5/5Verified
Fit perfect and great idea
Curtis S.5/5Verified
Fix the problem!! Dealership wanted $600 to replace the plastic neck.
Gailan D.5/5Verified
Nicely designed and super easy to install. Well worth it incl the tariff:)