95-97 OBS trucks had the "lift pump" as they were commonly called as well, on top of the motor in the valley. There isn't an electric fuel pump in the tank(s) that I know of.
When I replaced one of my tanks on my 95'(totaled), there was a "sending unit" in the tank that had a pickup tube and a boot with a screen on the end of the boot. I got a price from the stealership for the sending unit because the boot and screen were split and had come apart. They said that the boot and screen assembly were not sold separately and that I would have to buy the unit as a whole for over $370! That is what prompted me to put an inline filter system on that truck.
Guys, chime in and correct me if I am wrong on this pump in the tank question.
I will be the first to admit that I am wrong on these trucks since I am still trying to learn the basics of these trucks, let alone know as much as some of the guys here on the boards.
I did go back through some of my posts from last year and checked on Tail_gunners truck. He has an early '99 with this filter setup on his and he doesn't have anything special listed to use it. He does have the "hutch" in-the-tank mod listed though and I don't know what kind of mod that is.
Anyway, hope this info helps and good luck if you decide to go with that filter setup!
Daniel