gas gauge in 89 past full - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jjmorrse · 01-21-2011, 08:11 PM

I am hoping someone can help me with some specifics. I have an 89 suburban, 350, 700r 2wd, no tach in dash. Since I have gotten it last year, the gas gauge has been pegged past full. I have searched the forums, and gotten a feel, but the advice that the gas gauge wire is plugged into the side of the fuse panel doesn't seem to fit my specific vehicle.

I had it at the mechanic, he said he tested the sender when he replaced the fuel pump, and it was good. He said it was the gauge. I took out the cluster, cleaned contacts with a eraser, replaced with a new gauge from LMC. It promptly went way past full as soon as it was hooked up. I have cleaned the ground wire to the sender from the tank and reattached.

It would really help me if someone has worked through this problem on a similar model. I have taken out the fuse labeled gauge , but it made no difference in the reading. Is there something I can disconnect to get the gauge to read empty?

My thinking is as follows: It is likely not the sender, or it would read weird and move around some, and the mechanic checked it, although that is nota guarantee. It is unlikely two gauges would be broken exactly the same way, so it is likely a wiring problem?

Any help is greatly appreciated.

jjmorrse · 01-24-2011, 02:47 PM

bump

sixshooter798 · 01-26-2011, 12:13 AM

I had the same problem on my 77. There is a round plug on the firewall, just behind the carburetor, more to the driver's side than anything else. Its about the size of a nickel. Make sure that the proper wire is plugged into that.

motornut · 01-26-2011, 01:23 AM

a break in the sender wire will make it go past the full
try grounding the sending wire it should go empty
or run a temp/test wire to replace the sending wire

jjmorrse · 01-28-2011, 10:22 AM

Thanks for the input, I appreciate it.
Posted via Mobile Device

sixshooter798 · 01-30-2011, 05:59 AM

Did this get fixed?

jjmorrse · 01-30-2011, 12:57 PM

I had to put it on back burner till have time to work on it more. I'll keep updated

sixshooter798 · 01-30-2011, 08:39 PM

Heres a link to the picture of what I was talking about.

http://67-72chevytrucks.com/vboard/s...45#post4237845

jjmorrse · 05-08-2011, 01:16 AM

I am unable to make it go empty by grounding.

01-21-2011, 08:11 PM	#1
jjmorrse Registered User Join Date: Aug 2010 Location: east tx Posts: 128	gas gauge in 89 past full I am hoping someone can help me with some specifics. I have an 89 suburban, 350, 700r 2wd, no tach in dash. Since I have gotten it last year, the gas gauge has been pegged past full. I have searched the forums, and gotten a feel, but the advice that the gas gauge wire is plugged into the side of the fuse panel doesn't seem to fit my specific vehicle. I had it at the mechanic, he said he tested the sender when he replaced the fuel pump, and it was good. He said it was the gauge. I took out the cluster, cleaned contacts with a eraser, replaced with a new gauge from LMC. It promptly went way past full as soon as it was hooked up. I have cleaned the ground wire to the sender from the tank and reattached. It would really help me if someone has worked through this problem on a similar model. I have taken out the fuse labeled gauge , but it made no difference in the reading. Is there something I can disconnect to get the gauge to read empty? My thinking is as follows: It is likely not the sender, or it would read weird and move around some, and the mechanic checked it, although that is nota guarantee. It is unlikely two gauges would be broken exactly the same way, so it is likely a wiring problem? Any help is greatly appreciated. __________________ jjmorrse 86 C30 crewcab big dooley. 454- 400

01-24-2011, 02:47 PM	#2
jjmorrse Registered User Join Date: Aug 2010 Location: east tx Posts: 128	Re: gas gauge in 89 past full bump __________________ jjmorrse 86 C30 crewcab big dooley. 454- 400

01-26-2011, 12:13 AM	#3
sixshooter798 Desert Rat Join Date: Jul 2010 Location: Mojave Desert Posts: 169	Re: gas gauge in 89 past full I had the same problem on my 77. There is a round plug on the firewall, just behind the carburetor, more to the driver's side than anything else. Its about the size of a nickel. Make sure that the proper wire is plugged into that.

01-26-2011, 01:23 AM	#4
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: gas gauge in 89 past full a break in the sender wire will make it go past the full try grounding the sending wire it should go empty or run a temp/test wire to replace the sending wire __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350

01-28-2011, 10:22 AM	#5
jjmorrse Registered User Join Date: Aug 2010 Location: east tx Posts: 128	Re: gas gauge in 89 past full Thanks for the input, I appreciate it. Posted via Mobile Device __________________ jjmorrse 86 C30 crewcab big dooley. 454- 400

01-30-2011, 05:59 AM	#6
sixshooter798 Desert Rat Join Date: Jul 2010 Location: Mojave Desert Posts: 169	Re: gas gauge in 89 past full Did this get fixed?

01-30-2011, 12:57 PM	#7
jjmorrse Registered User Join Date: Aug 2010 Location: east tx Posts: 128	Re: gas gauge in 89 past full I had to put it on back burner till have time to work on it more. I'll keep updated __________________ jjmorrse 86 C30 crewcab big dooley. 454- 400

01-30-2011, 08:39 PM	#8
sixshooter798 Desert Rat Join Date: Jul 2010 Location: Mojave Desert Posts: 169	Re: gas gauge in 89 past full Heres a link to the picture of what I was talking about. http://67-72chevytrucks.com/vboard/s...45#post4237845

05-08-2011, 01:16 AM	#9
jjmorrse Registered User Join Date: Aug 2010 Location: east tx Posts: 128	Re: gas gauge in 89 past full I am unable to make it go empty by grounding. __________________ jjmorrse 86 C30 crewcab big dooley. 454- 400

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