what should the stock fuel pressure read? At idle and WOT? Thanks
It reads right now at 9 psi at idle and 4 at WOT. The lift pump and the injector pump have just been replaced. The fuel filter was too and the strainer was cleaned.

 

If I were you, I'd seriously look into a kit from Scotty. I posted a few pics and my story on my experience with his kit here a few days ago. It made a huge difference in my FP, running a stock in tank LP, and a stock VP44. I'd say it about doubled my pressures. When you see the pictures of old vs new, it tells the tale.

I'll find it and link it here in an edit.

CLICK HERE TO READ WHAT HAPPENED

CLICK HERE FOR PICS OF KIT PARTS

 

it seems to differ with every truck, but those numbers aren't abnormal by any means... They aren't good numbers though either.

Guys on here run a variety of different solutions to help rememdy the situation. Look around or do a search for LP applications and make a decision based on price and performance that suits your application best. Good luck!!!