CWBRONC,

As described already, the lift pump is visible just below fuel filter. It is not different than replacing a pump on a gasser, but on our 95's, it's a pain to get to (unless you have long arms). The suspension makes it hard to reach from below, and the master cylinder/vaccum booster and lines make reaching from top hard too (mine being 4wd sits higher too, hard to reach for short guys like me!). There are two bolts that hold the pump in, and a bracket behind the pump that secures the fuel preheater (left of pump). My original pump was an AC/Delco, but a replacement from local Cummins shop was a Carter brand. It was a bolt in swap, but the fuel in/out ports were slightly different, so had to bend the outlet line and add a longer inlet (rubber) line. Don't recall if the pump came w/a new gasket (think so), or if I bought one. Hardest part is holding the pump in place, w/o dropping the gasket, keeping the bolts from falling out and holding the preheater bracket in place all at the same time - and starting the bolts in w/o crossthreading. Needed about 2 more hands! My pump had a scored & scuffed bore, and sticking check valves, most likely due to grit/garbage in fuel. Attached a photo of the Delco (oem) pump, disassembled if that helps...
If you are having fuel problems, could also be a bad overflow valve in the outlet line of the inj. pump (had that fail too). Also, the rubber interconnect fuel lines at the firewall where they transition to steel are prone to rot and leaking. No special tools, just usual sockets/wrenches (offsets help). I'd post the cummins part #, but they change part numbers like underwear, so likely has been superseded a dozen times by now. They should be able to find it from the CPL # on your engine data plate anyway.
Good luck,
-Scott