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Help and confused, My fuel gauge quit working and need help to fix. I did OHM readings and this is the results: tank sending unit 74.1, bumper wire both ends 74. 4, back fender wire 37.3, door florr two places 21.7 and 22.4, fuse box harness 0.7, and fixed dash fuel connections three each-when facing dash left side 5.0, middle (grnd)0.5 right 74.4. I guess I forgot o test actual gauge, but when I disconnect one of the back wires it bottoms out to full and when I reconnect it goes to about 7/8 full.Thanks for any help on this problem.
 

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If I read what you tried correctly, you measured 74.1 ohms to a good ground with the sender wire disconnected. This is close enough to give you the 7/8 reading on the fuel gage. (7/8 = .875 X 90 ohms = 78.75 ohms). If you are getting 74.1 ohms between the sender output (wire off) and the sender frame, the sender is acting up. I'm assuming you don't have 7/8 of a tank of gas.
 

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<BLOCKQUOTE>quote:</font><HR>Originally posted by John_Muha:
If I read what you tried correctly, you measured 74.1 ohms to a good ground with the sender wire disconnected. This is close enough to give you the 7/8 reading on the fuel gage. (7/8 = .875 X 90 ohms = 78.75 ohms). If you are getting 74.1 ohms between the sender output (wire off) and the sender frame, the sender is acting up. I'm assuming you don't have 7/8 of a tank of gas.
<HR></BLOCKQUOTE>
I am pretty sure I have less than a 1/2 tank, but the best way I guess to check is to drain it the old fashion way and siphon it or is there an easier way to do it?
 

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<BLOCKQUOTE>quote:</font><HR>Originally posted by gfox:
I am pretty sure I have less than a 1/2 tank, but the best way I guess to check is to drain it the old fashion way and siphon it or is there an easier way to do it?<HR></BLOCKQUOTE>

How about driving around in it??
 

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Everybody has a different way to drain a tank. This is the one I use and gets it down to a couple of gallons. I park the car on the top of a driveway apron or approach. That way the tank is elevated. I use one of those cheap siphon squeeze balls to start a siphon. Since the can is on the apron and below the tank, it siphons it fairly well.
 
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