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Ground the wire that connects to the sending unit that is on top of the gas tank. If your gas guage goes to full with the ignition key in the on position your gas guage is ok. Then you need to pull the sending unit out of the tank turn your ignition back on and move the float up and down on the sending unit. If your guage shows different readings then your sending unit is ok also. Now you need to pull the float off of the assembly and shake it if there is gas in the float you need to change the float. Ground the wire that connects to the sending unit that is on top of the gas tank. If your gas guage goes to full with the ignition key in the on position your gas guage is ok. Then you need to pull the sending unit out of the tank turn your ignition back on and move the float up and down on the sending unit. If your guage shows different readings then your sending unit is ok also. Now you need to pull the float off of the assembly and shake it if there is gas in the float you need to change the float.

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15y ago
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Q: How do fx the fuel gauge on a 1988 ford f 350?
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