I didn't think to replace the injector return line harness, even though i had a tough time removing them from the injectors while standing right beside the engine (fenders removed). If the pressure is low and there are no leaks in the fuel return hose assembly, the most likely cause is the return line pressure regulator which is part of the return hose assembly. Also put air pressure to return of injectors while cranking, that did give me.
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The lly injector return lines are known to degrade over time, and if one section has failed, others may not be.
Crank or start the engine and verify that the fuel pressure is greater than 4 bar (58 psi).
So on the lml the injectors need to have i think like 150 psi in the return lines leaving injector to run right, has any one dealt with the regulator going. It seems to me that it should be a valid and safe test to block the return line from the pump (steel pipe), and run the injector return (rubber hose) into a container, then attempt to start the engine. One of the most common issues i encounter with no starts after a fuel system replacement on an lml engine is the possibility of the fpr1, fpr2, and fuel temp connectors being mixed up. While repairing just the leaking section might seem economical, it’s often a temporary fix.
