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Electrical & Wiring Troubleshooting electrical problems.

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  #1  
Old Mar 1st, 08, 5:27 PM
72SSdummy 72SSdummy is offline
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Ronnie
 
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Default gas gauge problem 72 chevelle

I have a 72 chevelle gas gauge worked properly when I purchased it sometime after filling it up I noticed the gauge went all the way to
3:00 and has stayed. I unpluged it at the rear of the car and put 12volts
to it ; it moved to 4:00 when took off voltage it returned to 3:00.
Please help.
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  #2  
Old Mar 1st, 08, 5:50 PM
Dave427 Dave427 is offline
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Default Re: gas gauge problem 72 chevelle

Ground the sending unit wire it should go to empty, then leaving it open it should go over the full mark. This test checks the gauge in the dash.

Dave
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  #3  
Old Mar 1st, 08, 7:59 PM
72SSdummy 72SSdummy is offline
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Default Re: gas gauge problem 72 chevelle

Did what you said. Gauge went to E when I disconected it went back to 3:00 whats next?
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  #4  
Old Mar 1st, 08, 8:08 PM
72SSdummy 72SSdummy is offline
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Default Re: gas gauge problem 72 chevelle

around 1:00 would be full
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  #5  
Old Mar 1st, 08, 8:17 PM
Brucebodyman Brucebodyman is offline
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Default Re: gas gauge problem 72 chevelle

Double check the ground wire. I believe it is just sheetmetal screwed to underbody in front of tank. take it off clean area it attaches to and clean ring at end of wire & reconnect. The gauge on my ElCamino acted up & this fixed it.
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  #6  
Old Mar 1st, 08, 8:39 PM
72SSdummy 72SSdummy is offline
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Default Re: gas gauge problem 72 chevelle

thanks for your help I will try that and see if it takes care of the problem. I am a little sceptical since it went way past full without reconnect the sending unit
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  #7  
Old Mar 1st, 08, 8:56 PM
Dave Birdwell Dave Birdwell is offline
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Default Re: gas gauge problem 72 chevelle

Quote:
Originally Posted by 72SSdummy View Post
Did what you said. Gauge went to E when I disconected it went back to 3:00 whats next?
What's next?? How about some punctuation marks so we can understand what you said??

Here is what should happen. Disconnect the sender at the connector behind the license plate or where ever it is easy for you to get to. The Tan wire is what you're looking for. Take the wire, and ground it to the body. Your gauge should go to "E". If it goes back to 3:00 when you reconnect it, you have one of two problems. Either the ground for the sender is bad as mentioned above, or the sender in the tank has opened up the circuit.
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  #8  
Old Mar 2nd, 08, 7:05 PM
frankiblu frankiblu is offline
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Default Re: gas gauge problem 72 chevelle

would that be the same for a 66 my gauge is stuck on full. I unplugged wire of back of tank and nothing happened
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  #9  
Old Mar 2nd, 08, 9:15 PM
medina medina is offline
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Default Re: gas gauge problem 72 chevelle

same thing on my 70
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  #10  
Old Mar 2nd, 08, 9:20 PM
red Chevelle SS red Chevelle SS is offline
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Default Re: gas gauge problem 72 chevelle

I have the same problem, please keep me in the loop if you get it repaired. jstewart@nelbran.com
Thanks, Joel
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  #11  
Old Mar 3rd, 08, 6:50 PM
Dave Birdwell Dave Birdwell is offline
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Default Re: gas gauge problem 72 chevelle

Quote:
Originally Posted by Dave Birdwell View Post
Here is what should happen. Disconnect the sender at the connector behind the license plate or where ever it is easy for you to get to. The Tan wire is what you're looking for. Take the wire, and ground it to the body. Your gauge should go to "E". If it goes back to 3:00 when you reconnect it, you have one of two problems. Either the ground for the sender is bad as mentioned above, or the sender in the tank has opened up the circuit.
Here's how to test it, go out to the garage and get to work!
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  #12  
Old Mar 3rd, 08, 7:51 PM
ToocoolZ28 ToocoolZ28 is offline
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Default Re: gas gauge problem 72 chevelle

Mine did the same thing, after testing everything I replaced the sending unit. Works perfect now.
Ron
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  #13  
Old Mar 4th, 08, 7:36 AM
dreis454 dreis454 is offline
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Default Re: gas gauge problem 72 chevelle

I had the same problem......
I took out the sender & cleaned the 'lock ring' that holds the sender in (it had a tiny bit of rust on it) & it works fine now
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  #14  
Old Oct 26th, 14, 3:38 PM
shnort shnort is offline
 
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Default Re: gas gauge problem 72 chevelle

where can I find a fuel gauge for a 1972 chevelle without the round gauge? Mine is to the right of the spedo and reads full on top to empty is down. Thanks Bucky
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