Been working on an lbz, its loosing prime and has a hard start/ no start... At first when i put a gauge on the test port and pumped it up to 15psi it would bleed down from 15 psi to 2 psi in 2 mins.. I noticed when i pulled the passenger side injector return line off the and pumped the primer fuel shot out the metal return the hose hooks on to but not out the injector return hose.. So i could not get the truck to make over 8k rail pressure.. I pulled both main injector return lines for both banks and nothing comes out there wile priming.. I pulled the hose off the fprv and nothing came out there.. I changed the cp3 and the bleed down time is now 9 mins from 15 psi to 2 psi.. Is it possible that i have an injector stuck open? Also fuel filter has been replaced has new filter head... Merchent bleeder screew and wif plug.. Truck isnt losing fuel on the tank side of the filter head its on the engine side... Is there anything im over looking???