Oil & Fuel Fuel gauge stuck on F on B7500

[sktractor]

Hi All

The fuel guage is stuck on F on my B7500. Anyone know what might be causing that. Does it mean the sender in the tank is bad?

Thanks.

 

[ScottyChip]

Check the ground, that was the problem with a old truck I had.

 

[kthompson]

Look in the tank with flashlight to see if the float and all look ok.