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#91512 01/14/2005 2:08 AM | Joined: Sep 2003 Posts: 37 Junior Member | | Junior Member Joined: Sep 2003 Posts: 37 | Just got a "new" '59 and the gas gauge pegs to the full side. Seems to be the opposite problem that other folks are having. What causes it to read full when I turn the key?
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#91513 01/14/2005 2:23 AM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | You have a short to ground somewhere in the wiring between the gauge and the tank, or the sending unit itself is shorted out.
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#91514 01/14/2005 3:37 AM | Joined: Jan 2002 Posts: 622 Member | | Member Joined: Jan 2002 Posts: 622 | 4onthefloor, speak truth.
I am betting that it's your sending unit. Pull that sucker out and do some tests. It's been a while since I've had that problem but the last time I managed to fix my sending unit by soldering the broken pieces. Start by taking it out of the tank and moving the float rod and see how that changes the gauge. It's possible that the short may be at the terminals on top of the gauge. Also make sure that the rubber gasket is in good shape.
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#91515 01/14/2005 9:57 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | GM gas gauges are wired so when the circuit is open the gauge will go way over to full. Ground the wire at the sending unit & see if the needle goes to empty. If it does your sending unit is bad or not grounded. If it doesnt change you have an opening in the wire between the gauge & sending unit. 
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#91516 01/15/2005 1:25 AM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | Are you sure, bender?
Mine goes to empty when I disconnect my gauge wire.
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A lone amateur built the Ark. A large group of professionals built the Titanic. | | |
#91517 01/15/2005 5:25 AM | Joined: Aug 2001 Posts: 1,285 'Bolter | | 'Bolter Joined: Aug 2001 Posts: 1,285 | Agree here. No contact from sending unit to guage registers full and in a hurry! | | |
#91518 01/16/2005 4:32 PM | Joined: Jan 2002 Posts: 622 Member | | Member Joined: Jan 2002 Posts: 622 | Get a spare sending unit. Hook up the wires and move the float arm, noticing the needle deflection. This will tell you if it's the sending unit or the gauge. I'll bet, sending unit. They go bad from water condensation in the tank, and rust. Also the brass floats can develope a hole and get flooded. If you need an entire sending unit, and can't find the right one for your tank, fear not. I soldered and wired together the parts from a totally different sending unit on mine and IT WORKS.
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