1970 Gas Gauge Weirdness - Impala Tech
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post #1 of 4 (permalink) Old 10-04-2016, 09:12 AM Thread Starter
 
 
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1970 Gas Gauge Weirdness

The gas gauge hasn't been working for years. I purchased a new tank and sending unit (Bob's Impalas), dropped the tank and tested the sending unit before installing it into the tank. It tested great but after putting it into the tank it seemed to not work. I had initially put 5 gallons in it in case I needed to drop it again. I dropped the tank again, pulled the sending unit out again and tested it again.

As before I tested it with the ground connected where it would go etc. moved the float and it seemed to work fine.

After putting it all back together I put 12 gallons in expecting it to show half tank. It is showing a little less than quarter tank.

Does anyone know why if working it is not very accurate?

-ken
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post #2 of 4 (permalink) Old 10-04-2016, 11:53 AM
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Bad ground!

Big Dave
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post #3 of 4 (permalink) Old 10-05-2016, 09:49 AM Thread Starter
 
 
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Really? I used the same ground when testing it outside of the tank when it worked. The ground looks good and has a good connection to the body.

What is the best way to determine how to proceed?

-ken
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post #4 of 4 (permalink) Old 10-05-2016, 01:11 PM
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Run a twenty five foot wire from the negative terminal to the ground post on the fuel sender. Your gas gauge will work fine. If you extend that ground wire to the trunk area and ground your light buckets to it your rear lights will always blink and be brighter, Steel is a rotten electrical conductor. Rust makes it even worse. The factory uses the body shell for ground because it is cheaper than a ground wire. They save maybe a dollar or two per car but when you make four million cars a year that will pay for a lot of booze and dancing girls for the annual Christmas party.

Big Dave
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