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

Fuel Pressure Testing:

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Old Jun 24, 2020 | 03:25 PM
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Default Fuel Pressure Testing:

Just picked a test kit but after screwing hose onto the Schrader of my '89 the reading was zero with key on for >2min.
Then tried it on my '88 (which starts & runs), same deal zero pressure even with engine running.

Examined the end of the test hose to find there was no pin to depress the Schrader???

All vids I've seen the hose is simply screwed onto the Schrader w/o need to remove the valve core.

Am I right here??
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Old Jun 24, 2020 | 06:58 PM
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Originally Posted by 65Z01
Just picked a test kit but after screwing hose onto the Schrader of my '89 the reading was zero with key on for >2min.
Then tried it on my '88 (which starts & runs), same deal zero pressure even with engine running.

Examined the end of the test hose to find there was no pin to depress the Schrader???

All vids I've seen the hose is simply screwed onto the Schrader w/o need to remove the valve core.

Am I right here??
remove the cap, then screw on the hose to the gauge.....you should be able to depress the pin on the top of the schrader valve to see if anything squirts out....if so, she's got some kind of pressure
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Old Jun 24, 2020 | 08:13 PM
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maybe not screwed on far enough to push that little button in... don't get your face too close to that fuel rail.... and don't inject gasoline into your hand.
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Old Jun 24, 2020 | 10:04 PM
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Originally Posted by knikula
maybe not screwed on far enough to push that little button in... don't get your face too close to that fuel rail.... and don't inject gasoline into your hand.
Gas injection isn't possible at less than 50 psi.

I would take a pic of the end you are screwing onto the schraeder valve. Not sure why there is nothing there.
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Old Jun 25, 2020 | 12:06 AM
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I think this test kit from AZ had been loaned out and someone messed with the hose end.

Going to return the test kit for a refund and find another unit elsewhere.

Thanks for the confirmation on how this "should" work.
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Old Jun 25, 2020 | 09:07 AM
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Originally Posted by 65Z01
I think this test kit from AZ had been loaned out and someone messed with the hose end.

Going to return the test kit for a refund and find another unit elsewhere.

Thanks for the confirmation on how this "should" work.
it's about 8 bucks for a hose and gauge at a auto parts store....get one
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Old Jun 25, 2020 | 09:10 AM
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Originally Posted by playsdixie
it's about 8 bucks for a hose and gauge at a auto parts store....get one
Which one is that? THIS is $45
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Old Jun 25, 2020 | 09:16 AM
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Originally Posted by aklim
Which one is that? THIS is $45
I'm really guessing, I got a gauge with a short little hose and connector at advanced auto.....didn't think it was very much....not 45 bucks anyway
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Old Jun 25, 2020 | 09:33 AM
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Originally Posted by playsdixie
I'm really guessing, I got a gauge with a short little hose and connector at advanced auto.....didn't think it was very much....not 45 bucks anyway
I'm not sure which one you got. You can get the cheaper one without the braiding but It is about 30 some. I probably wouldn't trust anything as cheap as a $10 fuel pressure gauge. Couldn't afford it
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Old Jun 25, 2020 | 11:29 AM
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Originally Posted by aklim
I'm not sure which one you got. You can get the cheaper one without the braiding but It is about 30 some. I probably wouldn't trust anything as cheap as a $10 fuel pressure gauge. Couldn't afford it
you're right, I checked , I paid 40 something for mine.....shaved the price for the war dept......
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