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This directly conflicts with my experience. Here's what I experienced with operating the rear PTO on my M936A2 - Transmission in neutral. T-case in neutral. Engage the rear PTO. Transmission in 1-5. (Remains at idle). Immediatley adjust throttle for 1500+ rpms.

Was the lift pump new?

You took a good hard look at the threads where the fuel pressure sensor attaches at the top of the lift pump?

Run the fuel line into a jug of diesel. This will tell you if your problem is with the fuel tank. Edit - also check all your lines and fittings between the lift pump and the small filter on the block.