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So I just replaced basically my entire fuel system on my 62 Bel Air. Brand new tank, sending unit, hoses, hardline to carb, inline fuel filter, fuel pump. The dilemma is before I replaced everything my fuel gauge did not work at all. Now it works and shows the correct amount when off, 1/2 tank. That's correct. When I turn it over/turn on the ignition it goes down to 1/4 tank, which is wrong. I turn it back off, goes back to 1/2 tank again. The connections should be good on the ground and the single pole wire to the sending unit on the tank. Any thoughts? Thanks!
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Is there a missing resistor or ground? Possibly under the dash or near the cluster? -
The only thing I didn't replace was the gauge to sending unit wire, it is original and plugged right into the pole on the new sending unit with no issue. So I am not sure if theres a ground or something up front. You think theres a bad ground at the gauge? It seems to me theres an opposite polarity going on. The gauge is working, it's just doing the opposite of what i think it should be doing.Comment
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Sounds to me like the gauge is bad. It's an old car, so that would be my guess since you have replaced everything to new.Originally posted by SilverbackComment
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Some of the GM products were screwy when it came to gauges
especially Fuel Gauges.
Some were gauge wire grounded FULL.
Some were gauge wire grounded EMPTY.
Step 1 Remove wire to gauge at the tank with engine on.
If needle on Fuel Gauge falls to Empty or Full, problem is with the tank.
Step 2 Ground Gauge wire to ground. Needle will go to opposite direction of
Step 1.
Step 3 Ground Gauge wire to tank as this will prove the grounding of the tank to
chassis. Fuel Gauge will operate as in Step 2. if not, tank sensor is faulty.Comment
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