2005 Merc Mtn Drinks Gas

2005 MERCURY MOUNTAINEER
121,188 MILES • 6 CYL • 4WD • AUTOMATIC
Avatar
DUKE SERRANOVA
  • MEMBER
  • 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.
Image (Click to enlarge)
Attached Media
Mar 27, 2011 at 7:26 AM
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 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 9:15 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle