Question about 1989 Ford F 150

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Fuel sending unit for a 89 ford f150

Fuel gauge is not reading right. Gauge is reading 3/4 full but acts as out of fuel. Topped up tank which takes next to nothing to fill tank and now it shows full and is acting as if tank is empty. Any help would be great.

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Most likely the sensor will have to be replaced . Had a float with fuel inside caused a similar fault. Worth a check

Posted on Mar 12, 2015

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Needs change the sensor in the fuel tank

Posted on May 07, 2013

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Posted on Jan 02, 2017

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SOURCE: 1986 f-250 duel tanks fuel gauges not registering right

id say either your sender unit is nackered or you have a bad earth to the body

Posted on Feb 05, 2009

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1 Answer

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I would bet the sending unit is bad but lets check it, a good test i use is that i have a used sending unit i connect to wiring to test the gauge and wiring, if the gauge moves when i move the testing unit then i know the gauge is good and the wiring to, locte the connector at fuel tank, and unplug it, this will be the one the leads to top of the tank and the connector will be on the side be the frame on drivers side, the way you know you have the right connector will be the truck will not run as this connector has the sending unit and pump wires in it, if the gauge goes to full then you know the wiring is good and the gauge is good, you can jump the two wires and gauge should go to full also. the problem is you must get the right wires for sending unit or you may pop fuse, let me see if i can get you a wiring diagram or just do the full test by unplugging connector.

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