I worked on Dodge Cummins for 14 years before retirement and have replace more than my share of the electric lift pumps. Even with the short pull from the tank to motor on a P/U these pumps didn't last. Dodge's fix was to mount the pump in the tank same as the gas engine P/Us.
The $800 you quoted was that the Cummins pump ? Or was that parts and labor?
You can use a different electric pump to move the fuel from the tank, but if the Electronic Control Module is hooked up to activate a different brand of pump it may continually set a " Lift pump voltage out of range " code.
Is your current pump moveable ? Or like the P/Us of 03>05 mounted direct to the side of the fuel filter housing?