Question about 1994 Mercury Grand Marquis

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I have a 1994 grand marquis the fuel gage has 2 line on top and 2 lines on bottom showing and it has a co code on the dash the owners manuel says if this happens have it serviced imeditly what has happened to the car? it is starting to run ruff and back fire

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  • Anonymous May 15, 2009

    I have the same year with the same problem when I fill the tank. After some gas burns off the guage will function as normal. My car has done this for the last 5 years with no other issues. I don't think it has anything to do with your car backfiring.

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I had this happen under warranty. The dealer replaced the fuel sending unit in the tank and it's been fine ever since. The Ford service manual specifically lists this as the fix for this code. If you have someone fix this for you, take the car to them with a nearly empty tank - they'll thank you for it!

Posted on Jul 06, 2009

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Posted on Jan 02, 2017

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