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The IP is pretty easy to go through on these units. I've got a post that is a tear down and repair with pics. Easy to remove and disassemble. If you've had issues with the pump before, yes.. pull it apart and check it out.

For testing...I'd unhook the fuel supply to the injection pump... get a small pump from a parts store and supply fuel from a fuel can directly to the IP and see if the problem is persistent.

Have you checked voltage at the fuel pump when it starts to die? I had a bad ground do funny things with thebpumps. The only other thing I can think of is you are sucking air somewhere but it doesn't sound like it. Have a way to test fuel pressure? It doesn't sound IP related if it starts...

Fuel filters? It sounds fuel related for sure. Is the shut down solenoid deenergizing and shutting it down or is the solenoid still up when it happens?

Fuel tank cap vent? Could be vapor locking.