1988 Chevy Suburban fuel pressure loss

1988 CHEVROLET SUBURBAN
15,000 MILES • V8 • 4WD • AUTOMATIC
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BUD HENDERSON
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  • 2 POSTS
Whenever this TBI engine has been off for a while it takes about 3 seconds of cranking to start. If you do a restart within a few minutes it fires right up with no delay. I suspect that there is a a loss of fuel pressure and it takes a few seconds to build up after sitting for a while. Is there a fuel pressure check valve some where that is a least partially bad?
Also, when driving and applying brakes before or immediately after having partially open throttle the brakes have no power boost. No problem if you get your foot off accelerator for a second. Is there a vaccum check valve that is not holding vaccum in the booster when the engine has reduced vaccum?
Apr 23, 2008 at 5:22 PM
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BLACKOP555
  • ✓ASE Certified Mechanic
  • 10,386 POSTS
  • ASE Certified Mechanic
you may either a bad fuel pressure check valve, or more likely a leaky injector.

have them checked, make sure the cap is on the check valve.



for the brakes i would definetely check the checkvalve. it is located on the brake booster or inline on the vaccum hose from the engine to the booster.
Apr 23, 2008 at 8:16 PM
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