Question about 1997 Mercury Mountaineer

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My 97 mountaineer fuel guage always reads full

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Likely a bad sending unit in the tank.... not a job for most people... Sparking Wires inside a gas tank... Dropping the tank is a big job...

Posted on Apr 28, 2015

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You should try to reset the fuel gauge. If it doesn't work, then the sensor might be bad. Go to the nearest auto shop to see about getting it fixed or even replaced.

Posted on Apr 25, 2015

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Posted on Jan 02, 2017

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SOURCE: Fuel guage reads 1/4 at all times even when full. How do I repair

1.If the needle on the guage is stuck. you can try tapping the guage to see if the needle moves or turn the ignition on and off a few times to see if you can get it to move. If the guage drops to empty when you turn off the ignition you know that its not the guage. (note that the guage does not drop to zero when ignition is off with all cars of this age).

2. The problem could be with the sensor in the fuel tank itself. Rocking the vehicle up and down from the rear (you will need help doing this) may free the sensor level indicator ball in the tank.

Posted on Dec 17, 2008

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SOURCE: Beeping Noise & Fuel guage not reading accurately

Could it be your back up sensor going off that is making the sonar sound?

Posted on Feb 27, 2009

emissionwiz
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SOURCE: Fuel Guage reading full

this problem is caused by a defective fuel gauge sending unit in the fuel tank.

Posted on May 12, 2009

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SOURCE: 1992 f 159 dual tanks fuel guage not working

You will need to remove the wire for the sending unit on the tank and ground it to the frame with your selector switched to the tank you are working on and the key on. If gauge comes up to full then the sending unit is bad and gauge is good. Repeat process on other tank. The fuel tank switching valve on the frame also switches the wiring signal from either tank for the gauge. If no change with first test you will want to check the valve.

Posted on Aug 14, 2009

cincinaty5
  • 132 Answers

SOURCE: Fuel Guage Goes To Full

if you have pulled the sending unit wire from the sending unit the gage in the dash is bad .

Posted on Sep 05, 2009

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Less common causes are a faulty fuel guage or circuit in the instrument panel.

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First inspect all connections that are readily visible to insure that they are secure & free from dirt or corrosion.

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Hope this helps. Please do rate my answer. Thanks

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