[hatzie]

Since you're in Hotlanta you probably don't have much rust to deal with...

TPS commonly refers to Throttle Position Sensors. FTPS is the acronym you're reaching for...

I'd remove the bed bolts with a ratchet and lift the bed off with a buddy and set it on sawhorses or slide it back on 4x4 timbers til you can reach the sender. It's 8 or 10 bolts, a ground strap or two, and unplugging the tail lamps.

Option two is take the LH bed bolts out and unscrew the RH bed bolts about 1" then tilt the bed and support it very very very well.

Liberally coat the bed bolt threads with never seize before you screw em back in.
I usually coat the fuel line ferrule threads with never seize and slide the ferrule back on the line so I can coat the outside of the line as well.

NEVER EVER use impact tools on the bed bolts. The cage for the bed nuts gets wallowed out by the impacts til the nut is loose and then it just spins.

If the fuel lines weren't so miserable to R&R with the bed in place I'd think about dropping the tank but...
The FTPS is a push in deal just like a MAF sensor. Same location as the T800 trucks. Right through the top of the sender. Get a Delphi fuel pump and pressure sensor. Not worth the headache of using the aftermarket crap in this location.

The full set of 1998 service manuals are in my signature. Vol 3 & 4 has the FTPS troubleshooting info.