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

Schrader valve

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Old Jun 29, 2009 | 12:54 PM
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Default Schrader valve

My fuel pressure guage is dead and I'd feel more comfortable putting the schrader valve back in rather than leave it like this, but I don't have the one that should be there, always had a guage on it. Does anyone know if that valve is a dealer item, or can I get one from a Napa or Autozone?
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Old Jun 29, 2009 | 01:37 PM
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They look just like the one that goes in a tire valve stem
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Old Jun 29, 2009 | 02:01 PM
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I'm pretty sure it's a 1/8 NPT fitting w/ a #4an cap.
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Old Jun 29, 2009 | 02:05 PM
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Originally Posted by jimg's'93
I'm pretty sure it's a 1/8 NPT fitting w/ a #4an cap.
Sounds about right I know the outside threads are #4AN. The original cap I believe had an O ring in it also. I will go look at mine for you.
I also have a gauge mounted on the rail but I carry the valve & cap with me, The cap has a full black rubber insert mounted in the top of it, the valve also had a black rubber seal I would think GM used fuel grade for these parts,
hope this helps.

Last edited by floridamale; Jun 29, 2009 at 02:18 PM.
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Old Jun 29, 2009 | 02:29 PM
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Originally Posted by floridamale
They look just like the one that goes in a tire valve stem
Yes, but a different size. The schrader valve itself is the same as used in 134 AC, but not sure if it is the hi or lo side valve.
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Old Jun 29, 2009 | 03:06 PM
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Originally Posted by aminnich
Yes, but a different size. The schrader valve itself is the same as used in 134 AC, but not sure if it is the hi or lo side valve.
Mine is a 87 so it was before 134a I'm not sure about the OP's year
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Old Jun 29, 2009 | 06:32 PM
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Thanks for the replies guys, I guess I'll just make the trip over to the Chevy dealer.
This purchase should put them back in the black ink ;-)
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