Gas gauge wont hold still - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**1970 CST Short Wide** · 10-20-2003, 10:17 AM

My gas gauge needle moves back and forth from 3/4 to 1/4 while i'm driveing. I'm thinking sender unit ? anybody else have this problem? Who sells a good replacement?

Its driveing me nuts

Thanks
Steve
1970 CST Short Wide

landon4421 · 10-20-2003, 10:45 AM

I had the same problum ! Never really figured out what it was !

I changed the sending unit and the wire and the gauge stoped bouncing around ! A month later I tore the truck down, so all I know is it worked for that long !

Good Luck !

Ackattack · 10-20-2003, 10:49 AM

I got a new sending unit from LMC.

It sounds like you may not be getting a good ground.

**1970 CST Short Wide** · 10-20-2003, 11:15 AM

As I suspected. I'll be cheching for a good ground and look for a good replacement sender.

mikej71 · 10-20-2003, 11:54 AM

I have the same problem, but it only started after I replaced my instrument cluster bezel. I'm sure it's a ground issue, but I'm not sure where the cluster is supposed to be grounded to the dash.
Can somebody tell me where the ground is supposed to be connected? I don't know why I didn't note this when I pulled it out...

Mike

Solver · 10-20-2003, 12:12 PM

I had the same problem I think with my 71. The gas needle would flucuate back and forth when driving. I put in a different gas gauge and the problem went away

A.P. · 10-20-2003, 02:40 PM

Grounding as others said. Check them.

landon4421 · 10-20-2003, 03:48 PM

I had a ground issue with my dash also, mikej71 ! I just ran a wire from the back of the bezel and conected to the cab !

Hope this helps ! Landon

SWEET7T · 10-20-2003, 05:39 PM

I just assumed it was from gas sloshing around in the tank...

When I turn a corner it moves up and down as the gas moves to one side or the other. It stays pretty still when going straight.

mikej71 · 10-20-2003, 08:42 PM

Thanks Landon. I've tried attaching a wire from the metal housing to a screw that's in the bottom of my dash, but I guess i'll just try moving it around to different places.

Mike

10-20-2003, 10:17 AM	#1
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,095	Gas gauge wont hold still My gas gauge needle moves back and forth from 3/4 to 1/4 while i'm driveing. I'm thinking sender unit ? anybody else have this problem? Who sells a good replacement? Its driveing me nuts Thanks Steve 1970 CST Short Wide __________________ 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

10-20-2003, 10:45 AM	#2
landon4421 Life is Good ! Join Date: Mar 2002 Location: Hollister, Ca. Posts: 1,992	I had the same problum ! Never really figured out what it was ! I changed the sending unit and the wire and the gauge stoped bouncing around ! A month later I tore the truck down, so all I know is it worked for that long ! Good Luck ! __________________ '72 Chevy C10 4x4 shortbed "Project" '71 Chevy C10 2wd longbed "partsrunner" '91 Chevy Burb 4x4 "kidrunner" '14 Honda Accord Sport "commuter"

10-20-2003, 10:49 AM	#3
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	I got a new sending unit from LMC. It sounds like you may not be getting a good ground. __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

10-20-2003, 11:15 AM	#4
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,095	As I suspected. I'll be cheching for a good ground and look for a good replacement sender. __________________ 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

10-20-2003, 11:54 AM	#5
mikej71 Unregistered User Join Date: Dec 2001 Location: Houston, TX USA Posts: 538	I have the same problem, but it only started after I replaced my instrument cluster bezel. I'm sure it's a ground issue, but I'm not sure where the cluster is supposed to be grounded to the dash. Can somebody tell me where the ground is supposed to be connected? I don't know why I didn't note this when I pulled it out... Mike __________________ 71 SWB Stepside SB400/TH350

10-20-2003, 12:12 PM	#6
Solver Registered User Join Date: May 2000 Location: Storm Lake, Ia Posts: 1,449	I had the same problem I think with my 71. The gas needle would flucuate back and forth when driving. I put in a different gas gauge and the problem went away __________________ 1972 Cheyenne Super 20 LWB-Blue 1972 Cheyenne Super 10 LWB-Black 1972 Cheyenne Super 10 LWB-Red 1972 Cheyenne Super 10 LWB-green 1972 GMC 4x4 LWB-White 1971 Cheyenne 10 LWB-Ochre 1971 Cheyenne 20 Longhorn-Copper 1971 Cheyenne 20 Longhorn-Black 1969 Custom 10 LWB-lt blue 1968 GMC 3/4 ton-green 1968 1/2 ton swb stepside-silver 1967 Chevrolet CST 10 LWB-green 1967 Chevrolet custom 20 LWB-Maroon

10-20-2003, 02:40 PM	#7
A.P. Black 72 Chevy Join Date: May 2002 Location: Los Angeles, California Posts: 662	Grounding as others said. Check them. __________________ 72 Chevy, SWB, 350engine, TH400

10-20-2003, 03:48 PM	#8
landon4421 Life is Good ! Join Date: Mar 2002 Location: Hollister, Ca. Posts: 1,992	I had a ground issue with my dash also, mikej71 ! I just ran a wire from the back of the bezel and conected to the cab ! Hope this helps ! Landon __________________ '72 Chevy C10 4x4 shortbed "Project" '71 Chevy C10 2wd longbed "partsrunner" '91 Chevy Burb 4x4 "kidrunner" '14 Honda Accord Sport "commuter"

10-20-2003, 05:39 PM	#9
SWEET7T Try spinnin 4 rear tars Join Date: Sep 2003 Location: Salt Lake City, Utah Posts: 757	I just assumed it was from gas sloshing around in the tank... When I turn a corner it moves up and down as the gas moves to one side or the other. It stays pretty still when going straight. __________________ SWEET7T 1970 C10, 2wd, LB, 307/TH350/3.08. PS, PB

10-20-2003, 08:42 PM	#10
mikej71 Unregistered User Join Date: Dec 2001 Location: Houston, TX USA Posts: 538	Thanks Landon. I've tried attaching a wire from the metal housing to a screw that's in the bottom of my dash, but I guess i'll just try moving it around to different places. Mike __________________ 71 SWB Stepside SB400/TH350



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