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

Somebody help .-.

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Old Jan 13, 2021 | 01:31 PM
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Default Somebody help .-.

After some research I have found that this to check the fuel pressure...? Basically I got the car a month ago and just recently noticed it and saw there was no cap it smells like gas coming out and when I noticed the cap missing the car had problems staying on for more than 5 seconds... could that be the case and where can I get a new cap for it thank you also I’m new to forums :/

wait I can’t upload the photo

Last edited by IssacV; Jan 13, 2021 at 01:33 PM.
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Old Jan 13, 2021 | 01:34 PM
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Hh
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Old Jan 13, 2021 | 01:35 PM
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G

Got it !
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Old Jan 13, 2021 | 01:44 PM
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Originally Posted by IssacV
After some research I have found that this to check the fuel pressure...? Basically I got the car a month ago and just recently noticed it and saw there was no cap it smells like gas coming out and when I noticed the cap missing the car had problems staying on for more than 5 seconds... could that be the case and where can I get a new cap for it thank you also I’m new to forums :/

wait I can’t upload the photo
The plastic cap doesn't hold the fuel in. There is a small valve similar to whats in a valve stem on your wheels. The cap just protects the valve. Are you leaking fuel out of the test port?
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Old Jan 13, 2021 | 02:54 PM
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Originally Posted by Phobos84
The plastic cap doesn't hold the fuel in. There is a small valve similar to whats in a valve stem on your wheels. The cap just protects the valve. Are you leaking fuel out of the test port?

yes... what’s circled in the image has gas or what smells like gas bubbling out 😔
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Old Jan 13, 2021 | 03:40 PM
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Originally Posted by IssacV
yes... what’s circled in the image has gas or what smells like gas bubbling out 😔
use a valve stem tool and try to tighten the valve, just like on a car or bicycle
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Old Jan 13, 2021 | 04:07 PM
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Originally Posted by 383vett
use a valve stem tool and try to tighten the valve, just like on a car or bicycle
I need a new cap any idea where I can find an original??
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Old Jan 13, 2021 | 06:02 PM
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Originally Posted by IssacV
I need a new cap any idea where I can find an original??
Any junk yard would have one. The U Pull & Pay I go to wouldn't even charge you for one. Just find a GM with a test port on the rail.
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Old Jan 13, 2021 | 07:38 PM
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The cap is not your problem. The schrader valve needs to be replaced.
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Old Jan 13, 2021 | 08:01 PM
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These GM#'s might actually do what you want - might!

25532663 or 88894338 for the Schrader and 25532662 for the 'cap'

I'd think local GM or ACD jobber

Last edited by WVZR-1; Jan 13, 2021 at 08:03 PM.
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Old Jan 13, 2021 | 08:48 PM
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I have something I bought that is all brass. I have a few left over since I bought the box of 5. I'm sure we can come to an arrangement.

https://www.grainger.com/product/JB-...JMEDM:20500731
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Old Jan 13, 2021 | 08:58 PM
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Found them. I had taken one out for the HSR and four sitting in the box waiting for disposal. For the price of the padded envelope and stamps, I'll sell you one of them. Been trying to clear out stuff so.....
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Old Jan 15, 2021 | 10:07 AM
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WVZR-1, Do you have a reference for a database to look up the original part numbers?
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Old Jan 15, 2021 | 10:38 AM
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Originally Posted by jrobin1
WVZR-1, Do you have a reference for a database to look up the original part numbers?
If you mean regarding the part(s) in question, yes for the L98 TPI. GM# 17110854 which would have been a kit that included 'all'. It would have serviced many/most GM TPI at the time. These are my own GM SPO Parts Catalog publications not a data base per se.

Last edited by WVZR-1; Jan 15, 2021 at 10:42 AM.
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Old Jan 15, 2021 | 08:46 PM
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I was actually referring to a generally available database where one could enter a part description from the FSM and get an original part number. Then shopping for a replacement part would be easier. I needed a short coolant hose from the throttle body to the tee connector which the FSM called a Throttle body to Heater input hose, but I never found the part on the internet just using the name. I purchased a foot long piece of universal heater hose to replace it.
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