Mechanics

CHEVY FUEL SYSTEM LOSES PRIME OVERNIGHT

1991 Chevrolet S-10

Engine Performance problem
1991 Chevy S-10 4 cyl Two Wheel Drive Automatic 185000 miles

I have to prime fuel system to start truck in the morning. After I do this, the truck runs fine all day. Starts fine, runs smoothly. The rear fuel pump and filter has been replaced.
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Keith1961
March 8, 2008.




Sounds like you need to replace the fuel pump relay. This is what primes the tbi on cold starts. Hope this helps

Tiny
Mastertechtim
Mar 8, 2008.
Agreeing with tim on this one, but like to add that a TBI vehicle is desinged to bleed the pressure when the engine is off.
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Blackop555
Mar 9, 2008.

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