Question about 1987 Ford F 150

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1987 fuel level guage issue 87 F150 Lariat XLT 5.0 2wd. Have a very similar situation. Front tank position shows empty even when I know there is gas. Rear tank position shows full after refilling but after only 66 miles, several 2-8 mile trips, gauge reflects empty. Front position still shows empty. Refilled rear tank with 14 gal and gauge shows full. Is gas siphoning into front tank and if so what is remedy.

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The gas is regulated from the switching valve you control off the dash. Check the valve to hear it switch
have a friend help you do this. it will be located under the truck between the two tanks. You may have a faultly valve or switch rattling inside changing the tanks setting also while driving which will be hard to tell

Posted on Jan 31, 2010

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Posted on Jan 02, 2017

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FUEL GAUGE READS FULL WHEN EMPTY AND EMPTY WHEN FULL


Did this get replaced recently?
Fuel level senders typically work by changing the resistance (and therefore current) depending on the fuel level determined by the position of the float mechanism in the tank. Since the guage you are describing is working exactly opposit to as intended, is it possible that an incorrect sender was installed, or, if there are 2 terminals on the guage, have the wires been switched so that the current is going through the wrong way?

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1987 fuel level guage issue


thats funny, my 87 F250 does the same thing. At 80 bucks a sender unit I have learned to live with it even tho this is what I do for a living.

The reason fuel gauges fail is because of sulfur in fuels.

Do a search on sulfur and fuel sender units failures and you will find your complaint is the same as the masses.

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