C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Want a locking fuel cap

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Old Mar 31, 2020 | 04:24 AM
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Default Want a locking fuel cap

For my 1990. I guess it's supposed to be a non-vented cap but the locking caps are pre-vented.

A pre-vented cap should be fine, right?







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Old Mar 31, 2020 | 06:42 AM
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I have a 96. I do use a locking cap that I believe is vented. Car runs perfect. I do not get any pressure build up in the tank. Dan
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Old Mar 31, 2020 | 07:46 AM
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..... Pre-vent-tion is what locking gas caps are all about ? Eh ? …..
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Old Mar 31, 2020 | 02:03 PM
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Originally Posted by Whaleman
I have a 96. I do use a locking cap that I believe is vented. Car runs perfect. I do not get any pressure build up in the tank. Dan
Something keeps telling me it should be a non vented cap. That's what I have on there now and I still don't even get so much as a short hiss when I unscrew it. Pretty sure it's the original cap.

Good to know, though, thanks.

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Old Mar 31, 2020 | 07:28 PM
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The definition of vented is very misleading. For these cars they are vented but have a check valve in the cap that lets air in only. The pressure goes out to the charcoal canister, no air can go out through the cap. I learned this the hard way. I bought a sealed cap. . And it pulled enough vacuum in my tank I had to use water pump pliers to get the gas cap off.
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Old Apr 2, 2020 | 02:21 AM
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I ended up just buying a cheap Duralast locking cap from Autozone today. I don't generally care for Duralast's stuff, but it was cheap and came two in a pack. I dunno why they sell em two in a pack, but it's what I got.

They're pre-vented and came with two sets of keys.
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