is it possible at all to use my existing fuel tank (1989 pontiac trans am GTA TPI 5.7L) and just swap the fuel pumps out...I have a 98 camaro steel tank..just wondering if I can swap the just the pump and leave the sending unit....that way the guage still reads correct..

Yep - that's what I'm doing w/ the exact same car... (I'm using a Walbro 255 pump, I'm thinking that a fourth-gen pump would be trickier.) You'll just need to use the Corvette filter/regulator assembly.

Check the sticky post at the top of this forum, & then do a search, & you'll have all the info you'll need.

Good luck.

sorry I'm a little new to this message board...one question...what is the reason I have to use the corvette regulator/filter assembly..the LS1 i have already has its own regulator on the fuel rail..right?? neways thanks for the help..

No, the LS1 regulator is in the tank pick-up.

For Corvettes, it's built into the fuel filter.

jackaharmon read the sticky man. Theres LOTS of info there that will answer pretty much all these types of questions there. Good luck with the swap