gmoniz, im new and didn't know there's an electrical section. i just put it under suburban because i felt maybe alot of other suburban owners have had similar experiences. bartamos, thanks for the info. i think ultimately it is the grounding like you said. i did not test the sending unit before installing it back in the burb because it was new. i did run direct wires from sending unit and acc/ign switch to the gas gauge and it still did the same thing-that is the needle goes to the right before the first white dot then back to the far left when ign is turned off. i did test the old sending unit out of the vehicle with direct wires as well and same things as before-it goes to the right just before the first white dot and to the far left when ign is turned off. so both old and new sending units are doing the exact same thing even with direct wires. according to the wiring diagram for this year truck, the gas gauge has 2 wires-one from the sending unit and one from the acc/ign switch. im thinking the gas gauge is not shorted or i don't think it would move at all-i could be wrong. i think you are right about the grounding. i have not really paid attention to this. i will wire brush the chassis where the sending unit ground attaches and i do have a good ground on one of the sending unit screws like you mentioned. it does have a good ground from battery to engine, but i have to check to see if there is a ground between the body and chassis. and most importantly i will put a ground from the dash gauge cluster unit to the body or probably even better to the chassis. im assuming that i can attach this last ground mentioned to one of the gauge cluster unit screws in the back like for the speedo, right? then to the body or chassis. as far as the float arm binding in the tank, i dont think so because i compared it to the original float arm side by side out of the vehicle and they both are in the same position and orientation, they travel up and down swinging the exact same way and distance. even the floats are tilted the exact same way when at full and empty positions. one good thing from all this is that i am now an expert at removal and reinstallation of a '55 chevy burb gas tank as i have done this 3 times already. thanks again for the help. -joe
p.s. i was looking at your '57 dq panel the other night...it's cool to see history like that.
