Using too much fuel

Tiny
MOLLYANDMISSY
  • MEMBER
  • 1988 GMC C1500
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
1988 gmc sierra is burning way too much fuel you can smell gas in the exhaust
Sunday, May 22nd, 2011 AT 2:05 PM

1 Reply

Tiny
JDL
  • MECHANIC
  • 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.
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Sunday, May 22nd, 2011 AT 3:52 PM

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