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as long as there is no air in the system, the injection pump usually has enough suction to still run. It isn't until you try to put it under a load that the lift pump is an issue. Usually also if it dies because of the lift pump, it will NOT restart until the lift pump is replaced.I’m starting to think it’s the new lift pump is bad. I started it this morning and it only ran for a couple of minutes before it sputtered and died.
Open the fuel filter drain in the front wheel well.
Crank engine.
If fuel comes out, then everything is working up to the fuel filter, and the issue is likely in the injection pump.
If no fuel comes out and engine will not start/dies, then it's lift pump most likely, though possibly check valves or fuel pickup completely blocked.
Only other option I can think of is something floating in the tank/pickup tube area that gets sucked up and blocks fuel flow, but after it sits for a while it drops back down until the next time it's run.