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My fuel gauge on front gas tank is not working and when i change to the rear tank the truck dies. borth tanks are full

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The problem with the front take will be repaired by replacing the sending unit in the tank,REcommend replacing the pump also since tank is out, the Fuel pump in the rear tank needs to be replaced, Replace the fuel filter after both tanks are reinstalled

Posted on Aug 28, 2010

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The gas gauge for the front tank on my 1992 F150 is stuck past full


You probably have a ground wire not making contact to ground on the front tank sending unit. OR the sending unit itself inside the tank is faulty. Either way, when a gas guage goes to full all the time (empty or full), this indicates that NO ground is available for the sending unit.

Apr 02, 2013 | 1992 Ford F150 SuperCab

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Hello: my gas gauge is not working on my 1998 cavalier , any help any suggestions, thank you.


you should be able to find the fuel tank harness under the car near the fuel tank. If you look just in front of the rear axle on the drivers side you will see two connectors Unplug the connector with the grey, purple, black, and black/white wires.

Ground the purple wire. Turn the key to the run position. The gauge should read full. If it does you have a bad sending unit (the part in the tank that tells the gauge what the fuel level is at).

If the gauge still reads empty you have a bad gauge.

Apr 26, 2011 | 2005 Chevrolet Cavalier

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87 f150 dual tanks fuel gauge doesn't work how can I troubleshoot this with a multimeter; what voltages/ohms values are normal


I have a1987 F-150. The gas gauge for the rear tank always indicate that the tank is full when I know it is not. I try to put gas in but the tank won't let any gas in. Is there some type of sensors inside the tank that won't allow the tank to be filled or is this a guage problem?

Feb 21, 2010 | 1987 Ford F 150

1 Answer

Front tank fuel gauge not working


If the gauge works on the rear tank but not the front, the problem is most likely the sending unit in the front tank. You will have to drop the tank to change it. I guess what I would do is, set your trip meter to zero when you fill the front tank. Then, run that tank to the point where the truck is starting to run out of gas and then switch to rear tank. Keep track of how far you can go on the front tank. Then when you refill the front tank reset the trip meter and switch tanks about 20 miles before you think it's going to run out. It's not a good idea to run those pumps dry. Just make sure you have gas in the rear tank. If you do decide to change the sending unit, run that front tank as empty as you can, also, I would change the pump too. In 92, I think the pump or the sending unit can be replaced seperately. The worst thing about changing those in tank fuel pumps is getting the gas out of the tank. No trip meter? Just write down the mileage from the odometer. Good luck.

Feb 06, 2010 | 1992 Ford F250

1 Answer

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...


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

Jan 31, 2010 | 1987 Ford F 150

2 Answers

I have a 2000 Chevy 3500 box truck with 2 gas tanks. The gas guage only goes to 1/2 with both tanks full and it won't pump gas from the second tank. How do I fix this.


Fuel levels are equaled in the tanks via a frame mounted transfer pump that transfers fuel from the rear tank to the front tank where the main pump is. Your transfer pump needs replaced, and should run about 60 bucks. Should find the pump mounted to the frame between tanks.

Oct 14, 2009 | 2000 Chevrolet 3500

2 Answers

1986 F150: Rear gas tank results in engine sputtering/dies


you are going to have to replace the in tank low pressure fuel pump, we call this the "lift" pump.

Oct 06, 2009 | 1986 Ford F150 SuperCab

1 Answer

Fuel Tanks reversed , Gauge not reading?


The Ford trucks were recalled for the tank switch replacement. Somehow the switches would pump fuel from one tank to the other. This would cause the one tank to overflow and or result in a fire from hot exhaust temps coming into contact with the fuel. Check the dash tank switch. It is probably bad.

Mar 12, 2009 | 1985 Ford F 250

1 Answer

Fuel Gauge not working


The switch that you use to change tanks is probably faulty - the switch supplies power for the sending unit in the tank, and to the transfer switch for the gas lines - use a meter to check it

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