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Re: Fuel gauge problem
Welcome to the 67-72 Truck Board from West Michigan!
My suggestion would be to pull the sending unit. Make sure the float is good and that it moves up and down freely.
Using an ohm meter check the resistance of the sending unit from the terminal to the metal tube. With the float in the empty position the reading should be 0 ohms. Moving the float to the full position should give you a reading of 90 ohms.
If the ohm readings are not between 0 and 90 there is a problem with your sending unit. Everything that you mentioned in your post points to the sending unit not working.
Good luck!
Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end
1965 Impala SS 400 sbc, Muncie rock crusher
1966 Impala SS 396 bbc, TH 400
1969 El Camino, 350 sbc, TH 350
1971 Snowplow built on a Blazer frame
1972 GMC Short bed, stepside, TH 400, 427 BBC
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