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Ran out of gas/Gas tank cap

TJ1978

TJ1978

I have MANY questions
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HankScorpio said:
When I need a gas cap I ask at the gas station attendant if I left my cap there. They usually pull out a box of random ones left behind. Take your pick.
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I approve this message however, I just left oreillys and will pick a new one up tomorrow morning..
 
Just beware that in the past the aftermarket has not been correct on gas cap fitment. That says "with evap", so that SHOULD mean that's a non-vented cap. Well it is, just way too high a psi rating without evap.

Non-evap = vented cap
 
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If you no longer have evap canister, you'll want to go with the vented cap
 
I must have missed the pre vent, part.
But that doesn't make sense to me.
Pre vent would pre internal combustion.
 
Wes Harden said:
I must have missed the pre vent, part.
But that doesn't make sense to me.
Pre vent would pre internal combustion.
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That’s what is confusing me. What does “pre vent” mean?

I’m going to get one from Napa and oreillys and compare them to the one I broke, by the pictures they look the same.. It’s still confusing the Stant cap says for EEC one says “pre vent” and both say they fit my truck.

CD27456B-A5AB-433F-A165-8A8129D31AE1.png
 
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I have zero experience with that style cap. The "later" style caps had/have been sold forever, incorrectly, so I would be wary of anything being sold now. There were two caps used for quite awhile, there had to be when evap was not used across the board, but apparently the aftermarket didn't care.

The good thing is that looks like if you got it in your hands, you could use your mouth to check if it's vented or not. A 16psi ("non-vented") cap will not bleed pressure when trying to blow through it. A vented cap will of course. The vented caps hold pressure, but it's 3psi IIRC.
 
TJ1978 said:
Amazon

View attachment 361367
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Stant was the only brand back when I was trying to find a vented cap, and they were wrong back then. Pick a truck that you know didn't have evap (dunno, 1973 federal emissions 454?) Then see what is specd for a CA light duty C10 the same year. Or hell, a C10 years later if they used the same cap. I can't easily find the specs for that 10800 cap, maybe rockauto would be easy to compare. Or LMC.
 
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