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Re: What does the fuel gauge do when truck is off?
My understanding is that the fuel gauge reads when the key is on, then stays at that reading until the next time the key is on (ie if you have 1/2 tank, turn off the key, siphon the tank, the gauge will still read 1/2 tank until the key is turned on).
But it sounds like your gauge is not changing when you add gas?? So, you need to determine whether your wire is bad or your sender?
Here is where you can check to see if the wire is carrying a signal.
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