using too much fuel

1988 GMC C1500
200,000 MILES • V8 • 2WD • AUTOMATIC
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MOLLYANDMISSY
  • MEMBER
  • 1 POST
1988 gmc sierra is burning way too much fuel you can smell gas in the exhaust
May 22, 2011 at 2:05 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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JDL
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 16,098 POSTS
How long since a tune-up? Any applicable mil codes? Use a gage and check fuel pressure. See if pressure holds after pump stops, you may have to block the return line. Some of these systems have an internal pressure bleed off.

If you have TBI you should be able to see injector leaking, where applicable.
May 22, 2011 at 3:52 PM
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