I think it was the rear float stuck , the person who drives the truck was only filling the front tank and not filling the rear one. I put it all back together and it seems to be working??? Who knows time will tell I guess. Thanks for the help.
So the primary pump tells the rear pump when to turn on and off? So the primary pump is most likely at fault? I did check the wires between the two pumps and they seem to be ok?
I have a 2007 6.0 Liter gas with the dual tanks , I'm not getting power to my rear pump, and my gauge is showing empty with a full front tank. And the truck and front pump runs??? checked all the fuses and relays under the hood but cannot find this "module" your talking about?? Any thoughts?