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OldRide Answers Home Using OldRide Answers Ask a Question   Browse Questions In: AMC Buick Cadillac Chevrolet Chrysler Dodge Ford Lincoln Mercury Oldsmobile Packard Plymouth Pontiac Studebaker Volkswagen Other Makes Classic Trucks  General Topics General Questions Help Identify Classic Car News General Restoration Vehicle Maintenance Site Suggestions & Comments          Search Questions:    juschillin      I recently Purchased a 1967 Chevelle which has a fluxuacting Fuel Gauge. What could be causing this?   posted: September 12, 2011       Answers (5)   toulebag      The fuel gauge works off of ohm resistance. Try hooking up a volt meter and while driving see if ohms flunciate or if it loses ohms. posted:  September 12, 2011   doording      Is it only occurring at certain times, like when the tank if full? Or does it happen non stop no matter if the tank is full, half full or almost empty? posted:  September 12, 2011   juschillin      When the tank is full it registers full and doesn't move, it seems that once approx 1/4 tank fuel is used it starts acting up. when I accelerate and decellarate its all over the place. I never got to the point close to empty tank due to the fuel gauge may no be correct. posted:  September 13, 2011   che57vy      Older vehicles had brass floats on the senders, and if they developed a pinhole, leaked, and filled up somewhat with fuel, they no longer "floated" on the surface of the fuel, but instead, bobbed up and down in the fuel. If your tank was full, then they would bob up and down in the entire height of your tank, going from empty to full and back to empty without any rhyme or reason. I don't know if a 196X GM would have a brass float, but the 57 chevy sending unit had a brass float, and this problem would cause the same symptom as you described. posted:  September 22, 2011   realfine      Try checking the ground wire to your tank. Probably a bad sending unit ! posted:  October 20, 2011

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