Gas gauge wont work!!!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

shane72_383 · 11-03-2006, 10:48 PM

The gas gauge in my 72 custom deluxe absolutley refuses to work. Its stuck at like a little over half a tank. I've had the cluster out numerous times and have installed aftermarket gauges for the bottom three and a tach in the middle. Im not sure if it has ever worked, i wanna say that it did before i took it out

but im not sure. Just looking for some advice on what to check/replace, thanks a lot. Shane

boogie67 · 11-03-2006, 10:58 PM

Did you check to see if it had a ground wire?I had to run a grd. when I changed out my cluster.

shane72_383 · 11-03-2006, 11:19 PM

A factory ground wire hooked up? Or have to add one? Why would i if i just plugged it back in? I dont have any clue

A.P. · 11-03-2006, 11:56 PM

One quick check you can do to see if it works is disconnect the single wire from the gas tank sending unit. The meter should go to full. If you short the wire from the sending until to ground, the meter should read empty.

shane72_383 · 11-04-2006, 12:00 AM

And if all that goes as planned, what would be the problem? Sending Unit?

A.P. · 11-04-2006, 02:38 AM

Sending unit.

manimal · 11-04-2006, 02:45 AM

A.P. is right just backwards. disconnect the power wire to the tank,the guage will fall to empty(no power),then ground the wire and the guage will read full.(do all this with the key on) If the guage does not change readings then you either have a bad connection(doubtful)or the guage is faulty.If the guage does change readings then the sending unit /float could be the culprit.-Sorry A.P. not trying to step on your toes!

A.P. · 11-04-2006, 04:12 AM

manimal thanks for the correction, it been a long time since I worked on the electrical on my truck.
A.P.

jamon8 · 11-04-2006, 10:06 AM

check the resistance at the tank

check the resistance at the fuse box connection

check the resistance at the back of the cluster connector

it should be between 0-90

0-empty
90-full

manimal · 11-04-2006, 10:40 AM

Not a problem A.P.

Green Machine · 11-04-2006, 10:48 AM

Quote:

Originally Posted by A.P.

One quick check you can do to see if it works is disconnect the single wire from the gas tank sending unit. The meter should go to full. If you short the wire from the sending until to ground, the meter should read empty.

Actually AP is right

manimal · 11-04-2006, 11:05 AM

Green Machine and A.P. you are both right, I just went and checked my 72 and you are right -MY SINCERE APOLOGY! My experience with troubleshooting fuel guage problems are from working on the old ford cars and trucks that I buy and sell. VERY SORRY AGAIN!

**VetteVet** · 11-04-2006, 12:11 PM

More info here.

http://www.6066gmcguy.org/Electrical-02.htm

shane72_383 · 11-04-2006, 03:02 PM

Thanks a lot everybody i'll have to try that.

11-03-2006, 10:48 PM	#1
shane72_383 Registered User Join Date: Apr 2006 Location: Osawatomie,KS Posts: 119	Gas gauge wont work!!!!! The gas gauge in my 72 custom deluxe absolutley refuses to work. Its stuck at like a little over half a tank. I've had the cluster out numerous times and have installed aftermarket gauges for the bottom three and a tach in the middle. Im not sure if it has ever worked, i wanna say that it did before i took it out but im not sure. Just looking for some advice on what to check/replace, thanks a lot. Shane

11-03-2006, 10:58 PM	#2
boogie67 Registered User Join Date: Mar 2005 Location: waco tx Posts: 584	Re: Gas gauge wont work!!!!! Did you check to see if it had a ground wire?I had to run a grd. when I changed out my cluster. __________________ 77 swb starting all over again.

11-03-2006, 11:19 PM	#3
shane72_383 Registered User Join Date: Apr 2006 Location: Osawatomie,KS Posts: 119	Re: Gas gauge wont work!!!!! A factory ground wire hooked up? Or have to add one? Why would i if i just plugged it back in? I dont have any clue

11-03-2006, 11:56 PM	#4
A.P. Black 72 Chevy Join Date: May 2002 Location: Los Angeles, California Posts: 662	Re: Gas gauge wont work!!!!! One quick check you can do to see if it works is disconnect the single wire from the gas tank sending unit. The meter should go to full. If you short the wire from the sending until to ground, the meter should read empty.

11-04-2006, 12:00 AM	#5
shane72_383 Registered User Join Date: Apr 2006 Location: Osawatomie,KS Posts: 119	Re: Gas gauge wont work!!!!! And if all that goes as planned, what would be the problem? Sending Unit?

11-04-2006, 02:38 AM	#6
A.P. Black 72 Chevy Join Date: May 2002 Location: Los Angeles, California Posts: 662	Re: Gas gauge wont work!!!!! Sending unit.

11-04-2006, 02:45 AM	#7
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Gas gauge wont work!!!!! A.P. is right just backwards. disconnect the power wire to the tank,the guage will fall to empty(no power),then ground the wire and the guage will read full.(do all this with the key on) If the guage does not change readings then you either have a bad connection(doubtful)or the guage is faulty.If the guage does change readings then the sending unit /float could be the culprit.-Sorry A.P. not trying to step on your toes! Last edited by manimal; 11-04-2006 at 02:47 AM.

11-04-2006, 04:12 AM	#8
A.P. Black 72 Chevy Join Date: May 2002 Location: Los Angeles, California Posts: 662	Re: Gas gauge wont work!!!!! manimal thanks for the correction, it been a long time since I worked on the electrical on my truck. A.P.

11-04-2006, 10:06 AM	#9
jamon8 Registered User Join Date: Apr 2006 Location: southern Il Posts: 335	Re: Gas gauge wont work!!!!! check the resistance at the tank check the resistance at the fuse box connection check the resistance at the back of the cluster connector it should be between 0-90 0-empty 90-full

11-04-2006, 10:40 AM	#10
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Gas gauge wont work!!!!! Not a problem A.P.

11-04-2006, 11:05 AM	#12
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Gas gauge wont work!!!!! Green Machine and A.P. you are both right, I just went and checked my 72 and you are right -MY SINCERE APOLOGY! My experience with troubleshooting fuel guage problems are from working on the old ford cars and trucks that I buy and sell. VERY SORRY AGAIN!

11-04-2006, 12:11 PM	#13
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,717	Re: Gas gauge wont work!!!!! More info here. http://www.6066gmcguy.org/Electrical-02.htm __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

11-04-2006, 03:02 PM	#14
shane72_383 Registered User Join Date: Apr 2006 Location: Osawatomie,KS Posts: 119	Re: Gas gauge wont work!!!!! Thanks a lot everybody i'll have to try that.



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