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Old 01-31-2009, 05:23 PM
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51 chevy truck gas gauge not working

new EZ-wiring 21 circuit wire harness, new 12v gauge in stock cluster, new 12v sender in new tank located behind the seat

there is two posts on the back of the gauge, one is for power the other for the sender, i have those wire hooked up properly. then the wire for the sender hooked up to the one post on the sender.

my gas tank is full and the gauge needle points to empty, Ivie had the gauge and sender both checked by my gauge guy and they worked for him but when i get them home and back in the truck they dont work for me.

so is it correct that if i take the sender wire off the sender and ground it the gauge will go past full? and if it does my gauge works, right. also for some reason if my tank isn't grounded the whole system would't work at all and the gauge would read empty right?

i think im on the right track just wanted some input before i start messing with this again

thank you,

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Old 01-31-2009, 07:18 PM
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Yes your right.Make sure the tank has a good ground.If you ground out the wire.Your gauge should go to full.
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Old 02-01-2009, 12:17 AM
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gas gauge

I ran into the same problem.I ran a ground wire from one of the holdown screws on the sending unit to the frame and the darn thing worked!
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Old 02-01-2009, 01:23 AM
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i was thinking about a ground strap of some sort. now i'll have to try one.
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Old 02-01-2009, 06:48 AM
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The body of the sending unit has to be grounded to complete the circuit.
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Old 02-01-2009, 07:07 AM
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could the brass screws i have attaching the sender to the tank prevent the sender from grounding?
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Old 02-01-2009, 07:30 AM
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Brass is an excellent conductor.....run a wire from one of those scres to the cab body.
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Old 02-06-2009, 12:20 AM
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i finally got around to working on my fuel gauge today. i found out there was gas in the float on the sender. i soldiered up the hole and she works like a dream.
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