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

fuel pressure test walkthough please!

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Old Jun 22, 2008 | 09:11 PM
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cwyates4
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Default fuel pressure test walkthough please!

Ok guys, just got a fuel pressure gauge hooked up. Can anyone give me a brief walk through before I loose daylight?

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Old Jun 22, 2008 | 09:24 PM
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Well, tried it myself. Hooked it up, turned key to on. Got just above 30 psi. Cranked, got just about 38psi. Turned car off, in 7 1/2 minutes, I'm at 20 psi. Now I'm seeing about 15psi after 10 minutes.

Hmm...
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Old Jun 22, 2008 | 09:30 PM
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thats about it, now your an expert, certified.
you can teach classes now.

there really is nothing to them. just a reading on the gauge and it can tell you alot about what your car is doing.
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Old Jun 22, 2008 | 09:33 PM
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Originally Posted by cwyates4
Well, tried it myself. Hooked it up, turned key to on. Got just above 30 psi. Cranked, got just about 38psi. Turned car off, in 7 1/2 minutes, I'm at 20 psi. Now I'm seeing about 15psi after 10 minutes.

Hmm...
now you have to isolate the leakdown. its either the fuel pressure reg, injectors, it could also be going back through the fuel pump. first thing to do is crimp the return line back to the tank and run the same test. if no leakdown its the reg. if it still leaksdown its probably injectors.
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