Checking fuel pressure

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May 29, 2017 | 04:54 PM

Ryanb08

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Checking fuel pressure

I have a 99 trans am and been having some trouble getting it to start I was gonna check the fuel pressure because my hunch is it is a fuel pump but every parts store I rent a tester from down not have the correct fitting for the schrader valve does anyone know the correct size fitting or have a link of where I could one or any advice at that fact lol thanks ahead of time for all your help

May 29, 2017 | 04:59 PM

rakrick

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Quote:

Originally Posted by Ryanb08

i found out the schrader valve external thread is AN4. i went to my local hydraulic hose store and got a fitting to mate up with my gage. i did have to remove the valve stem though. it sealed up fine though. good luck

May 29, 2017 | 05:07 PM

Ryanb08

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Well I went out and pressed it with a screw driver and got nothing so idk would that for sure be a fuel pump or something stopped up

May 30, 2017 | 09:25 PM

bgw70

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Quote:

Originally Posted by Ryanb08

Well I went out and pressed it with a screw driver and got nothing so idk would that for sure be a fuel pump or something stopped up

Did you do this with the engine on or off?
Turn the key on, engine off, then do it.

$20 fuel pressure gauge.
I have one, works well, correct schrader valve hose.
https://t.harborfreight.com/fuel-inj...ter-62623.html