Posted by Sprint 6 on July 01, 2017 at 05:39:25 from (172.76.203.74):
In Reply to: Duramax Update... posted by Bryce Frazier on June 30, 2017 at 15:19:19:
Before you go pulling the pump, what are your balance rates on the Tech 2? In my experience, any one over positive 5 can cause the low rail pressure code, two over 5 and an LB7 will have starting issues. Then you need to do a return rate check on each bank, if one bank is high, there is a suspect injector on that bank. Just because the injectors were replaced doesn't mean they are good. Aftermarket injectors are universally junk. If I open up an LB7, it gets genuine Bosch or GM. Did you clean or replace the rail to injector lines? Not doing that can take out even the best injector. Other things to look for are the fuel supply lines, I have been seeing them start to kink at the nylon flexible sections at the left valve cover, I think due to sagged engine mounts. I would highly recommend installing an Airdog, or other fuel supply system, to convert it to pressure lift system. The vacuum lift system is the Achilles heel of the Duramax. Fuel system 101 says never install a fuel filter on the vacuum side of a fuel system, but yet college edumacated engineers put right where it shouldn't be. The aftermarket supply systems also clean up the engine by eliminating all factory supply lines and filter housing on the engine. To end my ramblings, I don't see a lot of CP3 failures on the LB7s because it isn't worked to capacity. I would bet you have a supply restriction or a high return rate on an injector.
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