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GMC Forum: 89 GMC sierra fuel pressure?
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Old 07-24-2010, 04:00 PM
Jake . Jake . is offline
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Default 89 GMC sierra fuel pressure?

I have a 89 GMC Sierra with the 5.7 350l V8 that won't start. I've checked the fuel pressure but I don't know what the correct pressure should be. Does anyone know or know where I can find out?
I have a 89 GMC Sierra with the 5.7 TBI 350l V8 that won't start. I've checked the fuel pressure but I don't know what the correct pressure should be. Does anyone know or know where I can find out?
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Old 07-24-2010, 04:00 PM
catmandew catmandew is offline
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9-13 psi with the engine running, measured with a gauge spliced in just before the throttle body.
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Old 07-24-2010, 04:05 PM
Mr. KnowItAll Mr. KnowItAll is offline
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TBI? not less than 9psi.

It will run at that pressure, but you won't be able to pull a trailer or pass anyone on the freeway.

(Owner of a 1991 C-2500)

ADDED:
Email, or IM me.

ADDED:#2
Spray some carburetor, or starting fluid into the intake.
Crank it over.
If it starts and dies, you have a fuel delivery problem.
If it does NOT start, you have an ignition problem.

ADDED:#3
GM (chevy) uses an oil pressure sensor that turn off the fuel pump if there is no oil pressure. Check the basics first. Got Oil?
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Old 07-24-2010, 04:05 PM
toadyboy toadyboy is offline
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if it has an electric fuel pump and injectors it should be 45 to 50 pounds of pressure if it has a carbeurator it should be between 4 and 6 pounds of pressure good luck gerald
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Old 07-24-2010, 04:05 PM
toadyboy toadyboy is offline
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if it has an electric fuel pump and injectors it should be 45 to 50 pounds of pressure if it has a carbeurator it should be between 4 and 6 pounds of pressure good luck gerald
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