1996 Cadillac EL Dorado rough idle

Tiny
DEMDEV9403
  • MEMBER
  • 1996 CADILLAC ELDORADO
  • V8
  • FWD
  • AUTOMATIC
  • 56,000 MILES
When my gas tank is 75% full, my check engine light comes on and "service emission systems" message appears. The car runs rough and tends to stall. When I fill the tank and drive a few miles the messages go away and the car runs normally. Originally this problem happened when the car was very low on gas. Is this a fuel filter problem?
Wednesday, February 24th, 2010 AT 8:31 PM

1 Reply

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
I wouldn't think a fuel filter would be conditional dependant upon fuel level. You could have a split pipe in the fuel tank, and when the level is low enough it draws air and lowers volume, thus the stalling and service messages that I would guess are due to running lean. You would have to have a fuel pressure gauge installed to validate this.
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Thursday, February 25th, 2010 AT 12:10 AM

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