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2005 Merc Mtn Drinks Gas

Tiny
DUKE SERRANOVA
  • MEMBER
  • 2005 MERCURY MOUNTAINEER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 121,188 MILES
I have tuned up the engine, changed oil and cleaned fuel injectors, why when I fill up my tank $75, ouch, in 2 days of city driving, the tank is almost empty?

Please help! Mechanics are stumped.
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Sunday, March 27th, 2011 AT 2:26 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be running too rich due to the following

1. Excessive fuel pressure can be cause by restricted fuel return line
2. Defective Oxygen Sensors.
3. Leaking injectors and fuel pressure regulator.
4. Coolant temperature sensor out of calibration.
5. Restricted air intake system.
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Sunday, March 27th, 2011 AT 4:15 PM

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