Chevelle Tech - View Single Post - 1969 Fuel Gauge Stuck?
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post #4 of (permalink) Old Oct 7th, 17, 10:03 PM
Jim Streib
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Join Date: Oct 2003
Location: Saint Louis
Posts: 1,140
Re: 1969 Fuel Gauge Stuck?

To expand on what oldcutlass stated, this can give a false positive test. Granted the gauge with the ignition switch on and then grounding the sender wire in the trunk should make the gauge go to empty and then when ungrounded should have it going to full, you can also get the same results if the gauge has a defective shunt resistor on it.

Here are some tests I did on a 67 Impala gauge that is designed to work with a 0-90 ohm sender:









You can see how the gauge is thrown off without the shunt.

Ideally do some tests at the trunk connection to verify things before replacing the sender in the tank that might be good but instead you may have a gauge shunt issue.


Jim

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