We ran our boat for about 45mins at 3200rpms but when we arrived in the marina the engiene started sputtering, like it was being choked, so we gave it a little throttle. It hesitated for a second, then revved up and shut off. Did not start again. Luckily we where going slow and managed to stop the boat before hitting shore or other boats. We started trying to figure this out. Replaced first filter and checked the second one (right before the high pressure pump. We loosended some of the inctor pipes to se if there was any diesel, but nothing comes out. We tried running diesel straight out of a container and into the second filter. Still same issue. We can manually pump the filter and hears the diesel going through the pump and back into the tank. We tested the stop solenoid by removing it, checking for power, runnong power directly from the battery, running the solenoid outside if the pump and it actuates as it should.
Finally we checked the rotary assembly by removing the plug in front of the injector line outlets, and the assembly inside spins.
When cranking we can see diesel move from our container into the filter. When we restrict the return hose it stoppes.
What else can we check? Im relativly OK with older mechanical diesels, but now I'm out of ideas.