Hello all I have a 1999 2500 4 x 4 Cummins pick up truck. Previous owner had rebuilt the vp44 and replace the lift pump with a DDRP. I have an edge comp box on the truck otherwise the fuel system is as described factory size lines. I have a fuel pressure gauge at the banjo bolt on the inlet of the pump at idle I have 18 PSI and at wide open throttle it drops to about 3 PSI I have installed a half inch draw straw kit it hasn't helped I need help where do I look next to solve the low fuel PSI problem?