fuel switch again??

[Big Orange 83]

does the truck have to be running when i change the tanks with the switch or will it change if the key is turned to accessories?? or both?? thanks

[Big Orange 83]

man im about to burn my truck to the round.. thats what i feel like doin.. today i was putting the fuel switch back in its position when i hear the original clock in the truck start to tick.. well then i noticed the fuel gage goes way past full when i turn the accesories on, ans when i turn accesories off the gas hand goes to 3/4 of a tank.. WTF?? now i am driving with only one tank working and i dont know how much is in it.. how ironic.. anyone got suggestions?