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Old 12-29-2011, 11:09 PM   #7
auminer49r
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Join Date: Sep 2005
Location: Colorado Springs, CO
Posts: 10
Re: 72 Chevy C-10 Fuel Sending Unit Problem

Quote:
Originally Posted by fixit-p View Post
If the sending unit checks out, I would check the wiring for bad connections, high resistance and possibly a faulty gauge. There are some resistance specs here for testing the gauge.
OK Guys, I tested my sending units.

When the float is up it reads 96 Ohms, when down it reads about 1 or 2 Ohms. that Checks!

I fueled my truck up yesterday so my float should be riding high in the tank.
The sending unit in my tank is currently reading 69 Ohms. My fuel gauge reads 1/4 of a tank (bogus). At 69 Ohms shouldn't my gauge be reading up around 3/4 of a tank? The gauge is not properly interpreting the resistance that the sending unit creates.

I tested the tan wire, grounded to the gas tank, with the key on, I get a reading of 69 ohms (coincidence)?? Shouldnt I get a low number, close to zero?

thanks,
auminer49r

I think my sending unit is good. Would you agree?
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