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This could be a bad sending unit, it goes to full when wires are disconnected. the way to test your sending unit would be with a ohm meter connected to the wires and as you move the float the readings will go up or down, if they do not then sending unit is bad, if it is stuck on full it is hard to test by just removing the connector because reading should go to full when connector is unplugged, try jumping the wires at connector and see if it goes to empty, if it does then gauge and wiring are good and sender is bad. good day
It's not really easy to tell, you need to test for power and ground at the sending unit at the fuel tank,
while someone is watching the fuel gauge inside the vehicle. 90% of
the time (especially on Ford's) it's a faulty sending unit in the fuel tank, which is usually sold with the fuel pump...if not, I would replace the pump while I had the tank out anyway just as a precautionary measure. . the "float' is the part that of the sending unit that registers
fuel level and sends that
What Pin? Your sending unit is most likely worn out,on a 19 year old vehicle. Pull gas tank and replace complete assy,fuel pump and all,while your there.
the buffer plates in the tank seem to be loosely held! so sometimes they fall on the sender unit,causing the gauge to drop!!!!! when the vehicle is shaken!!!! remove that tank and have the plates checked!!!!
Sounds like it is time to replace the sending unit to the fuel gauge in side the tank. It registers until the fuel sloshes around in the tank and the movement causes the float to bounce around and then it shorts out the sending unit so it can 't register. The sending unit has two surfaces that must remain in contact to register. After years of moving around it develops play in the pivot point that causes a gap in the connection and thus a false reading. You will need to remove the fuel tank to accomplish this replacement. Remember be careful if you undertake this task. You will have fuel and vapor in the tank. Empty as much fuel as possible first.
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