E-pump inlet pressure
E-pump inlet pressure
I'm not sure about a shutoff valve. Don't know where it is or what it looks like. I have to investigate what's going on here. I didn't remove any plumbing when I pulled the engine out of the donor. I just connected the supply and return lines directly to the oe truck ones. I thought the oe tank pump just circulated to and from the Benz lines. I have to revisit my earlier threads where some of the folks on here explained it. I do recall they said it should be OK the way I plumbed it. Maybe over time it's not OK and has manifested in my current problem.