How To Fix The Missing Fuel Cap on Rams

Starting in 2013 and continuing still to this day, the Dodge Ram 1500, 2500 and 3500 turbo diesel trucks all have a pretty significant design flaw.

Yep, that’s a fuel filler that comes from the factory with no cap. A cap-less fuel filler design, really?

What were you thinking Dodge!?

How exactly is the mediocre seal on the fuel door supposed to protect against water and dirt getting into the fuel filler neck?

Of course, Dodge will not admit to this being anything other than the design as intended, but they did release a part number for the people that inquired about missing “gas” caps; the Mopar part# 52029561AA, which is a quite thin and cheaply made green plastic wedge style cap. These do not seem to be durable at all, and still are questionable in their ability to keep out contaminants.

Fortunately, there are a couple options aside from what Dodge has (or hasn’t) provided:

Aluminum Fuel Cap

Thankfully the aftermarket has seen this issue and noticed that people in fact actually want to seal their fuel filler necks from getting crap down into the tank.

The main problem that you’ll have when trying to add a normal fuel cap to one of these dodge trucks – there just isn’t enough room for a regular old gas cap to sit in there and still have the fuel door close.

This is why these billet aluminum caps have such a low profile, so that they can actually fit perfectly in the filler, seal it with an o-ring and still have space for the door to close.

2013-2017 Dodge Ram Diesel Fuel Cap Billet Aluminum Magnetic NEW EASIER GRIP DESIGN

Check Price
Amazon

as of June 26, 2025 2:17 pm

Features

• Aluminum Construction

Fuel And DEF Cap Combo

If you would prefer a more uniform look, there is a combo set available that combines the DEF and fuel cap replacements together in one kit.

Ram Diesel Fuel Cap and Aluminum DEF Cap Combo for 2013-2018 Dodge Ram Truck 1500 2500 3500

Check Price
Amazon

as of June 26, 2025 2:17 pm

Features

• ►Easy to grip：With gloves in winter. Hidden-Strong magnetism：Can't see the magnet, let alone be afraid of falling into the fuel tank.
• ►Compatibility Vehicles - Both fuel caps fit 2013 2014 2015 2016 2017 2018 Dodge Ram 1500 2500 3500 diesel trucks with a cap less fuel system, Cummins and Eco-diesel vehicles with 3.0L V6 engines
• ►Airtight & Precision Fit - Our diesel fuel caps are well sealed and can keep out dust, water, rain, snow and others to protect your fuel system,saving you costly engine repairs.
• ►Safe & Durable - Both dodge ram fuel caps are crafted with anodized billet aluminum which won't be impacted even after long-term exposure.
• ►Guarantee - We provide 12 months worry-free warranty and lifetime friendly service. If you have any problems please feel free to contact with us.Our service until you are satisfied.

OEM Style Plastic Cap

Aside from the thin green plastic cap, Dodge actually has another style of cap that is more robust and seems like it would do the job of protecting the open fuel filler system.

The part number for this cap: Mopar/Chrysler 82214609.

It does also come with a tether to keep the cap attached and from being lost, a nice feature for those of us that sometimes misplace our fuel caps when refilling our trucks in the morning before coffee.

Dodge Ram Fuel Filler Diesel Cap With Tether Non Locking NEW OEM MOPAR

Check Price
Amazon

as of June 26, 2025 2:17 pm

Features

• Non-Locking fuel cap for 2014-2016 Ram 1500, 2500, 3500
• Non-Locking gas cap for capless fuel filler housing
• Plastic capless cover and tether to prevent dust and debri from entering the fuel system.
• Diesel only

Conclusion

Hopefully this guide has helped you to find the best options for replacing your truck’s missing fuel cap. If you have any more questions or input about this issue, feel free to drop us a line below in the comments. Thanks for reading!