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02 Sport Trac Fuel Gauge stopped working

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Old 08-17-2012, 01:01 PM
ericcumbee ericcumbee is offline
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02 Sport Trac Fuel Gauge stopped working

It worked fine yesterday, however this morning the needle does not move when i start the truck up, it just stays below empty where it is when the truck is not on.
Reading this post it says that an erratic gauge might be the sign of a loose or failing wire. Would the gauge not moving at all be the sign of a completely failed wire? are there any diagrams that would help me find where the wiring to the tank is?
http://www.ford-trucks.com/forums/94...ease-help.html

also should note that all of the other gauges in the instrument cluster work fine Speed, Tach, Oil, Battery etc.
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Old 08-17-2012, 10:45 PM
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I dont know the specifics of this exact model, but normally when you turn on the key you send voltage thru a wire to the the float on top of the gas tank. THe float has a variable resistor that changes with float level. The gas gauge is basically a volt meter reading the voltage drop across the resistor inside the gas tank. If the wire breaks or the resistor breaks, you probably read zero.... or the gauge itself could be bad. If it was me i would crawl under the truck and look by the gas tank for a wire running to the top of the tank. If you bare a section of the wire and short it to ground (the frame) the gas gauge should go to max up or down. When you pull the wire off ground, and touch nothing, it will go the other way. I assume with no connection it goes to zero and when shorted to ground it is "full". You might also look in your operators manual and see which fuse controls the gas gauge and check it to make sure you have voltage TO the tank. If all this failes, then i assume the gauge is bad.
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Old 08-17-2012, 10:49 PM
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i almost forgot to update. i have done nothing to it today. i noticed it during a trip to town this morning. i got back home. it set for maybe 2 hours. Then i went to town again, and when i started my truck, it just started working again.

so i am not sure what to make of it at this point.
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