Hi, my trucks fuel system is giving me fits, had fuel pump fail (showed 0-4 lbs. of pressure) on camping trip. Hauled truck into town to a shop. Had a new raptor pump installed, great pressure 15-19 lbs. showing on the gauge. Loaded up the camper and horses headed home. When may fuel tank got around a 1/2, started losing pressure and died. Added fuel and made it home. Had the lift pump replaced, and all seemed well. Now I'm back down to 1/2 full again. and pressure drops when I go around corners. (the edge alarm goes off) Any ideas what to look for now?

1999 2500 5sp 234,000mi

 

Sounds like maybe your picking up some air at 1/2 tank . Iv'e never put a raptor on but from what I see on these forums theres work that has to be done on the fuel pickup in tank. Thats where I would start looking.