I cleaned the grounds in the engine compartment and the gauge worked once.I thought it was fixed.But the next time I started it , it went to full and stayed there.Are there other grounds to check? I really dont want to take the box off to get at the tank.
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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.
It may be the sending unit in the tank that needs replacing. Here's how you can check: Turn the key on and disconnect the sender unit at the gas tank. Ground the sender unit's wire with a jumper wire from the truck's harness to ground. Watch the gauge. If the gauge on the dash is good, grounding the sender wire will cause the gauge needle to react and should move to full. This would indicate a new sending unit is required. If the gauge doesn't move when the sender unit is grounded, the gauge is bad and needs replacing. Pull the instrument cluster out to replace the gas gauge. Likely any old ford gas gauge might work-back then, there were not so many production changes.
If you ground the wire from the gauge to the sender with the ignition on the gauge should go past full. If it doesn't you'll have to trace that circuit all the way back to the gauge. If that circuit is OK you may have a bad gauge or no power to it. If the gauge does go past full when you ground the fuel gauge wire your sending unit may not be grounded. I'm assuming there is a float on the sending unit.
Dont we wish it be full all the time but gas in it. Okay for the sending unit reading full its getting a full ground reading,Key on engine off. does it move and goe down. It should if it doesnt the problems with the gauge itself. 2 test disconnect the wire harness, did the gauge go down. the problem will be in the sending unit can be a hung float(Rare).
This may be two diffrent problems, first start by checking the fuses, check them all. next if you now how to unplug the fuel sender and then ground it, when unpluged it will read full when you ground it ,it will read empty, this is a way to see if the gauge is working, if the gauge reads when this is done then the fuel sender is bad and wiring and gauge are good, if it doesnt read then you will need to check gauge and wiring to gauge. next is speed, i would start by testing the sensor or cable to see if its working, your car may have a cable being a 1993, remove the cable and spin by hand and see if needle jumps also check for broken cable when removing, you can pull cable out of housing sleeve to see if its broken, start with these tests.