Fuse to pull to disable fuel pump between tanks

[PAE]

TRUCK is my 07 Chevrolet Silverado 3500 dually flatbed, 6.6L LBZ.

Im hoping this is simple but figured yall would know bout this, im tired of the truck pumping out my reserve tank.

ETA: its a relay not a fuse or switch, but maybe its a switch within the computer?

And since there isnt a switch that I know of.

TIA

 

[Bebop]

Read relay box cover

 

[PAE]

This truck doesn't have a factory FBC

 

[Snoop dogg]

 

[Snoop dogg]

 

[Snoop dogg]

Is that what you needed?

 

[PAE]

Yes thanks...

And thats the only electric fuel pump as the other is the injection pump and its mechanical from my reading.

Is that what you needed?