cheap gas cap - Dodge Cummins Diesel Forum
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post #1 of 22 (permalink) Old 03-18-2017, 11:30 PM Thread Starter
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cheap gas cap

Found this at home depot today fits great seals tight and only cost me 3.21 $









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post #2 of 22 (permalink) Old 03-19-2017, 12:13 AM
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I have he same one, works great!
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post #3 of 22 (permalink) Old 03-19-2017, 10:26 AM
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I had that after my fernco cap and before the billet cap. I stopped using it. I got thinking it may over time crack the filler neck. Tightening the wing nut expands the rubber seal. I have no proof or evidence that it may hurt anything. I just noticed over time i had to turn the wing nut more. When i got the billet cap it came with three o rings. I had to get a fourth even larger o ring to seal the cap. I attributed it to having a stretched filler opening. I just did not want to risk cracking it. But, i will say again i have no proof. It was possibly paranoia about nothing. Sort of a solution looking for a problem.

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post #4 of 22 (permalink) Old 03-19-2017, 11:00 AM
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Originally Posted by Jared Herzog View Post
I had that after my fernco cap and before the billet cap. I stopped using it. I got thinking it may over time crack the filler neck. Tightening the wing nut expands the rubber seal. I have no proof or evidence that it may hurt anything. I just noticed over time i had to turn the wing nut more. When i got the billet cap it came with three o rings. I had to get a fourth even larger o ring to seal the cap. I attributed it to having a stretched filler opening. I just did not want to risk cracking it. But, i will say again i have no proof. It was possibly paranoia about nothing. Sort of a solution looking for a problem.

How long did you use it ? I have had one now for over 2 years on my 2014. I don't tighten it very tight just enough to seal it. Never tried ,but probably could pull it out without undoing it. Have read about the concern of cracking the filler tube, but actually not heard of anyone doing it.
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post #5 of 22 (permalink) Old 03-19-2017, 11:36 AM
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Quote:
Originally Posted by Jared Herzog View Post
I had that after my fernco cap and before the billet cap. I stopped using it. I got thinking it may over time crack the filler neck. Tightening the wing nut expands the rubber seal. I have no proof or evidence that it may hurt anything. I just noticed over time i had to turn the wing nut more. When i got the billet cap it came with three o rings. I had to get a fourth even larger o ring to seal the cap. I attributed it to having a stretched filler opening. I just did not want to risk cracking it. But, i will say again i have no proof. It was possibly paranoia about nothing. Sort of a solution looking for a problem.
I was planning on going with the oatey cap--but I read the above on another forum too. I picked up both billet caps on Ebay...on the cheap--direct from the guy who makes them out of Idaho.
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post #6 of 22 (permalink) Old 03-19-2017, 12:24 PM
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Originally Posted by kplawncare View Post
Found this at home depot today fits great seals tight and only cost me 3.21 $







CAll me stupid.... What's wrong with the OEM cap ?

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post #7 of 22 (permalink) Old 03-19-2017, 12:46 PM
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cheap gas cap

The first flap would lift the wing nut cap. So i would tighten it enough to stay in place and not be lifted by the spring on the flap. I used this for several months only. The cracks i have seen other members get are possibly from the weight of the high flow pumps. Next time you get fuel you can see where the weight of the nozzle pulls on the green plastic and applies stress even with the standard nozzles.
I used the fernco cap on my 14. On my 15 dually the filler lip the cap sat on is much smaller so did not hold the fernco very well. So went to the wing nut cap then the billet.
In the photo you can see the filler neck is almost flush.
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post #8 of 22 (permalink) Old 03-19-2017, 01:27 PM
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CAll me stupid.... What's wrong with the OEM cap ?
Not stupid at all...on the newer trucks this is what comes from the factory with the new cap-less design.
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post #9 of 22 (permalink) Old 03-19-2017, 03:33 PM
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Originally Posted by -MJK- View Post
I picked up both billet caps on Ebay...on the cheap--direct from the guy who makes them out of Idaho.
Can you provide a link to the one's you purchased?

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post #10 of 22 (permalink) Old 03-19-2017, 03:54 PM
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. I picked this up from fleece last week. Has 2 O-rings and a magnet to stick to the door while filling up!


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post #11 of 22 (permalink) Old 03-19-2017, 04:47 PM
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Honestly, anything is better then nothing. The only way I would run it open, is if the truck was always on paved roads.

My concern with the "Pipe Seal" solution is how does the rubber handle diesel? Do you think it may dissolve the rubber? I'm NOT saying it does, it is just a concern of mine.

Other then it looking tacky, it should do the trick.

Personally I went with a billet cap.
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post #12 of 22 (permalink) Old 03-19-2017, 05:22 PM
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Originally Posted by HeavyTwo View Post
Honestly, anything is better then nothing. The only way I would run it open, is if the truck was always on paved roads.

My concern with the "Pipe Seal" solution is how does the rubber handle diesel? Do you think it may dissolve the rubber? I'm NOT saying it does, it is just a concern of mine.

Other then it looking tacky, it should do the trick.

Personally I went with a billet cap.
Yea.... Better THAN nothing I guess.

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