2005 Merc Mtn Drinks Gas

2005 MERCURY MOUNTAINEER
121,188 MILES • 6 CYL • 4WD • AUTOMATIC
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DUKE SERRANOVA
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  • 1 POST
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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Mar 27, 2011 at 2:26 PM
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RASMATAZ
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  • 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.
Mar 27, 2011 at 4:15 PM