Help with 66 fuel gauge issue for my son's sake.

logans66

New Member
Mar 2, 2022
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Las Vegas
So my son bought a 66 and we are restoring it. All new wiring, gauges, CVR and fuel sending unit. Here is the issue. I have verified the resistance behind the fuel gauge to verify that the correct amount of resistance is matching the full tank of gas. Also verified the CVR is pulsing and the correct voltage. I also bought another "new gauge" from CJ's and both gauges do the same dang thing. When the key turns on, the gauge goes all the way to full and then falls to under 1/2 full on the gauge. I have beating my head about this and after hours of checking and double checking, I am reaching out for my sons sake so he can drive this thing without running out of gas. Any thoughts.
 
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I do know that many people complain about the aftermarket senders with the stock gauges not working well. Honestly, your best bet is a NOS sender...or at the very least a used OEM sender in good shape. I know some people even go through the effort to restore them to avoid the aftermarket senders.
 
True story on the OEM parts
That said
Are you able to play with one of your new senders plugged in outside the tank?
You will need to ohm out the wires back and forth from the tank and test the senders output while plugged in
Do not forget it needs a good ground to work properly
 
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