i have a 88. i mounted the pump up high in the engine bay at the filter housing inlet. i can run it momentary, or constant. it is in line between the lift pump and filter.
i have all the fittings and block off plate to eliminate the lift pump, but it has not been done yet due to my leg being so bad i can not get under the truck.

well, that ain't exactly true. i can get under the truck just fine. but once down i need a crane to lift me back up to a standing position.