Fuel gauge question

[PANTERA]

Hey all,
Where is the sensor for the fuel gauge located? The reason I asked is because I notice that when the gauge is close to empty, and I shut the truck off for a bit, the gauge moves to damn near a quarter tank! Is this common? I'm guessing that when the truck is off, the system loses pressure and the fuel flows back to the tank, but that much? Thanks

 

[RonD]

The fuel gauge sender is in the tank with fuel pump.

Level isn't really changing in the tank, the sender and gauge are a resistance circuit, so with no power gauge will show whatever is has as a neutral position, some go to below empty, some a 1/4, some show a 1/2, never seen one that goes to full.
When key is turned back on gauge should return to actual level.