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1995 blazer: vortec..replaced fuel pump..wire harness..runs fine…

i have a 1995 blazer...
i have a 1995 blazer 4.3 vortec no fuel preasure replaced fuel pump twice and wire harness sometimes starts runs fine once in a while will not start turns over real good but no fuel preasure please help
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Answered in 3 minutes by:
6/29/2010
ZZDaryl
ZZDaryl, Chevy Technician
Category: Chevy
Satisfied Customers: 12,551
Experience: 28 year experience, Master Mechanic
Verified
If you are having pressure sometimes and sometimes not I would suspect the fuel pump relay or possibly a bad wire between the relay and the pump, if you jumper terminals 30 and 87 where the relay plugs in you should have voltage to the pump all the time so I would check that. (these numbers are labeled on the bottom of the relay)
ZZDaryl
ZZDaryl, Chevy Technician
Category: Chevy
Satisfied Customers: 12,551
Experience: 28 year experience, Master Mechanic
Verified
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The crank sensor does not affect the fuel pump.
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