1991 Chevy S-10 Fuel System loses prime overnight

1991 CHEVROLET S-10
185,000 MILES • 4 CYL • 2WD • AUTOMATIC
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KEITH1961
  • MEMBER
  • 1 POST
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.
Mar 8, 2008 at 9:33 AM
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MASTERTECHTIM
  • ✓Experienced Mechanic
  • 4,750 POSTS
sounds like you need to replace the fuel pump relay. this is what primes the tbi on cold starts. hope this helps
Mar 8, 2008 at 10:30 AM
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BLACKOP555
  • ✓Experienced Mechanic
  • 10,386 POSTS
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.
Mar 9, 2008 at 3:12 AM
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