I need help from anyone that is familiar with these engines. I was running the motor after it had sat for 6-8 months straight (I believe I put stabilizer and biocide in the tank at the last fill-up, but that was probably last fall). Anyway, it started right up after the long off-season, and I was running the motor at idle for about 20 minutes with no issues, when all of a sudden it sputtered and died. Since then, when you start the motor it fires right up, runs for almost exactly 40 seconds, then dies, every time. I figured air in the fuel system somewhere. So I bled it out, first at the spin-on fuel filter, then the injection pump, then the injectors themselves. No change. I changed the fuel filter and racor. No change. I removed the injection pump and cleaned it as best I could with seafoam. No change. So I’m basically stumped here. Tomorrow I’m going to unhook the fuel tank from the lift pump and run a temporary fuel line into a jerry can full of fresh diesel to eliminate the possibility of upstream issues and fuel contamination/deterioration. But I’m pretty much out of ideas. Any advice? Thanks