Gas gauge bounceing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**1970 CST Short Wide** · 11-30-2003, 12:33 PM

My gas gauge flicker between 1/2 and 3/4. I have replaced the sending unit and the resister on the back of the gauge its self. When I disconnect the wire to the sender my gauge goes to full so I know that’s working. Any Ideas on where to look next????
This is driving me Nuckin Futs.

Thanks
Steve

**old Rusty C10** · 11-30-2003, 12:47 PM

gound wire may not be making a good connection check tht maybe the wire to the connector is bad too

**1970 CST Short Wide** · 11-30-2003, 12:58 PM

I only see 1 wire to the sender, anybody know where the ground might be???

Longhorn Man · 11-30-2003, 01:08 PM

The bolts holding the tank in is the ground.
Corrosion is common.

zyggy72 · 11-30-2003, 02:46 PM

Check the whole length ofwire going to your sending unit. It sounds as if sending unit wire is chafed through and is grounding out on the body or possibly even the gas tank. I had the same problem and found that the way that the sending unit wire looped over and behind the gas tank chafed through the wires jacket.
Hope this helps

**1970 CST Short Wide** · 11-30-2003, 02:55 PM

Thanks for all the info guys. At least I have somewhere to look now

11-30-2003, 12:33 PM	#1
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,101	Gas gauge bounceing My gas gauge flicker between 1/2 and 3/4. I have replaced the sending unit and the resister on the back of the gauge its self. When I disconnect the wire to the sender my gauge goes to full so I know that’s working. Any Ideas on where to look next???? This is driving me Nuckin Futs. Thanks Steve __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565

11-30-2003, 12:47 PM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,277	gound wire may not be making a good connection check tht maybe the wire to the connector is bad too __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

11-30-2003, 12:58 PM	#3
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,101	I only see 1 wire to the sender, anybody know where the ground might be??? __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565

11-30-2003, 02:55 PM	#6
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,101	Thanks for all the info guys. At least I have somewhere to look now __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565

11-30-2003, 01:08 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	The bolts holding the tank in is the ground. Corrosion is common.

11-30-2003, 02:46 PM	#5
zyggy72 Can't kick the addiction! Join Date: Jan 2002 Location: Riverton, CT 06065 Posts: 402	Check the whole length ofwire going to your sending unit. It sounds as if sending unit wire is chafed through and is grounding out on the body or possibly even the gas tank. I had the same problem and found that the way that the sending unit wire looped over and behind the gas tank chafed through the wires jacket. Hope this helps



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