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Another gas cap CEL thread

417 Views 6 Replies 3 Participants Last post by  Michaelocalypse
Yes, I searched first. On Brave first, actually. That's how I found this forum. 馃檪

So the 2014 Patriot has an eternal Gas Cap CEL. The original failed, a couple (I think multiple, mom's Jeep) locking caps, and finally a new Mopar (Stant?) cap from the dealer. Still throwing a code.

This particular service guy at this particular dealer seems to actually be decent, and polite. He mentioned something about dropping the tank and replacing rotted hoses between the filler and tank.

I was mostly curious what's involved in this process, because I currently don't have a car, so I've got weekend time if it's not too involved. Or maybe there's a known problem that I haven't found yet.

Any help will be appreciated. Otherwise I'll be the guinea pig and report back with what we find.
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Just curious, has the rim of the filler neck been checked for pitting or rust that could cause the cap gasket to not seal properly?
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Just curious, has the rim of the filler neck been checked for pitting or rust that could cause the cap gasket to not seal properly?
I assume so, but I will ask and check it myself.
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This is from an older manual, but should give you an idea:

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The 2014 service manual including fuel system info is here:
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When my gas cap light came on, the first thing I did was to run to Autozone and get a replacement. That didn't help, so I went and got an OEM one from the dealer. That didn't help either. I then examined the top of the filler neck after reading threads on here. There were some small dings and pits from the gas nozzle hitting it when filling up. I stuffed a rag in the filler neck to keep debris out, then took some fine emery cloth and sanded around the neck opening until it was all nice and shiny and smooth. Then I removed the rag and spread a thin layer of silicone grease around the top of the neck. Gas cap light hasn't come back on in 2 years.

It is entirely possible that there is a small crack in the neck or rubber hose down by the tank which would require replacing the neck, but it's always best to check the little things first.

Edit: noticed you're new, welcome.
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This is from an older manual, but should give you an idea:

...

The 2014 service manual including fuel system info is here:
Oh, wow. That's not nearly as bad as I was anticipating. (PTSD from the clutch on this, and fuel pump on a Mustang 馃槄 )
Thanks for that link. Definitely helpful.

When my gas cap light came on, the first thing I did was to run to Autozone and get a replacement. That didn't help, so I went and got an OEM one from the dealer. That didn't help either. I then examined the top of the filler neck after reading threads on here. There were some small dings and pits from the gas nozzle hitting it when filling up. I stuffed a rag in the filler neck to keep debris out, then took some fine emery cloth and sanded around the neck opening until it was all nice and shiny and smooth. Then I removed the rag and spread a thin layer of silicone grease around the top of the neck. Gas cap light hasn't come back on in 2 years.

It is entirely possible that there is a small crack in the neck or rubber hose down by the tank which would require replacing the neck, but it's always best to check the little things first.

Edit: noticed you're new, welcome.
Thanks. Sounds like these filler necks are super soft. I'll definitely take a better look at that before doing anything else.
I haven't had time to work on mom's Patriot, but this morning I had a few minutes and decided to feel the little neck for dents. The whole right side of the ring is wonky and deformed. It's probably not something that'll sand down. I looked up filler neck replacements and Mopar has 4 different versions, so we're trying to figure out the right part number. I might have to take the thing half way apart to see which on she has.

She just called a parts department and looked it up by the VIN. They gave her part number: 5105806AD.

Now to see exactly what's involved with replacing it. Hopefully it's not as bad as my Mustang.
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