Maybe get a fuel pressure gauge and check the pressure at the rails? That could tell you if you are actually losing fuel pressure or if the truck just thinks it is.

 

het everyone sorry it took so long to update life went kinda crazy for a bit.I ended up dropping the tank and replacing the fuel pump what a PITA about 6 " of flex on that vent tube and fill tube would have been great but the good news is problem fixed 325,000 miles down now trying to make a million LOL Thank you all who helped you all are great

 

Yup, PITA. Very tight working conditions, but doable. Glad you got it done