Gas gauge - sender - Team Camaro Tech
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post #1 of 3 (permalink) Old Nov 26th, 14, 01:52 PM Thread Starter
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Steve
 
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Location: Wellington, Florida
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Gas gauge - sender

Happy pre Thanksgiving..

I just replaced my fuel tank due to a leak. While at it, I decided to change the sender (although the former one was working). I tested the new sender prior installing in the tank and got 1 ohm at the low end and just over 90 at the top end. I put everything together and the gauge doesn't move.

I checked the ground from the sender to the chassis and the pigtail connection in the trunk and all seemed fine. I then disconnected the pigtail and turned the key on and the gauge needle goes past full. I then grounded that same lead and the gauge goes past empty as it should. I then checked the resistance between the lead going to the sender and ground and got about 24 ohms. It think it has about 5 gallons in the tank. I checked the power from the pigtail to ground with the key on and get about 10 volts. When I put it back together, the gauge still doesn't move.

i am stumped. Any suggestions are appreciated.

Thanks,

Mr. Fixit
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post #2 of 3 (permalink) Old Nov 26th, 14, 03:00 PM
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Karl
 
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Re: Gas gauge - sender

Quote:
Originally Posted by Mr. Fixit View Post
Happy pre Thanksgiving..

I just replaced my fuel tank due to a leak. While at it, I decided to change the sender (although the former one was working). I tested the new sender prior installing in the tank and got 1 ohm at the low end and just over 90 at the top end. I put everything together and the gauge doesn't move.

I checked the ground from the sender to the chassis and the pigtail connection in the trunk and all seemed fine. I then disconnected the pigtail and turned the key on and the gauge needle goes past full. I then grounded that same lead and the gauge goes past empty as it should. I then checked the resistance between the lead going to the sender and ground and got about 24 ohms. It think it has about 5 gallons in the tank. I checked the power from the pigtail to ground with the key on and get about 10 volts. When I put it back together, the gauge still doesn't move.

i am stumped. Any suggestions are appreciated.

All your tests give the proper results...24 ohms is just about spot on for 5 gallons of gas. 10 volts is not correct from the power supply. I suspect a bad connection or broken wire in your circuitry. Disconnect the large wire connector (for the tail pan) in the trunk at the left rear quarter panel. Check the voltage on the "brown" wire from the dash at that point. It should read 12 volts, not 10.

Karl / VetteFreak
69 Camaro RS 350/350TH...Burgundy...711-Black Int/Houndstooth Seats
2007 Corvette Conv. LS-2/A6...Monterey Red/Black Top & Int
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post #3 of 3 (permalink) Old Nov 26th, 14, 03:09 PM Thread Starter
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Steve
 
Join Date: Nov 2013
Location: Wellington, Florida
Posts: 628
Re: Gas gauge - sender

Quote:
Originally Posted by VetteFreak View Post
All your tests give the proper results...24 ohms is just about spot on for 5 gallons of gas. 10 volts is not correct from the power supply. I suspect a bad connection or broken wire in your circuitry. Disconnect the large wire connector (for the tail pan) in the trunk at the left rear quarter panel. Check the voltage on the "brown" wire from the dash at that point. It should read 12 volts, not 10.
I realized what the issue was. It seems that the needle on the gauge was once removed and repositioned such that it was not registering the 5 gallons since it considered it empty. I moved the needle to a bit above 1/4 full and to test my theory, I once again removed the trunk pan connection, turned on the key to get a full reading. Then I reconnected the trunk connection and it returned to 1/4.

I will check the voltage issue regardless. Thanks for the input..

Thanks,

Mr. Fixit
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