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: 4,193	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 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: 3,524	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: 4,193	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 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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