a truck here at work is down yet again.....98.5 24V 3500 4x4 auto, edge comp, 5" exhaust, pyro/boost/trans guages.........truck wasn't getting any fuel up to the injectors and lift pump was rather loud and inconsistant in its pumping.....replaced both (lift pump is brand new, ip is a known good unit off a #53 engine we had around) now we are getting fuel up to only a couple injectors, truck still will not start and the fuel continues to bleed down.....throwing multiple codes (1693, 1689, 1691, 0122) can anyone offer some insight?

 

What do you mean by the fuel continues to bleed down? Make sure you are not sucking air. The lines are known to rust through along the frame behind the fuel tank. Crack all the injector lines loose and bleed out the air.