So rereading everything again and again we had cleaned that "T" after ip but maybe not a good enough job. We are going to reclean the lines and glass ball and spring as Ray 70 suggested as now I do think this is the culprit and will do Monday again and let you know when done. as makes sense as when ip seals leak it runs when sealed tight just runs for 10 sec. Only thing now that makes sense.
Mike, I want to double check that you are now fully understanding the function of the day tank as Guy described.
It is a gravity feed system from the day tank to the IP. You should not be looking for any significant pressure in the line to the pump as you had mentioned 6-7 PSI earlier. All you will get is gravity flow.
If the machine is running and then dies, immediately loosen the fuel line fitting at the back of the IP.
If you have flow ( with everything turned off ) then you know you have enough fuel in the day tank for it to run.
The most likely culprit of it shutting down after 10-15 seconds is the glass check ball located in the base of the T-fitting of the fuel return line that is screwed into the top cover of the Injection pump.
If that ball gets stuck closed it will cause the motor to start and run for only a few seconds, then shut off due to an increase in fuel pressure within the IP body.
Remove the T-fitting and the short fitting that attaches the T to the IP cover will have a spring loaded check ball inside it. make sure it is completely clean and free to move upward slightly towards the top of the T.
Mep-002A 003A spin on fuel and oil adapters
https://www.steelsoldiers.com/threa...a-drop-in-spin-on-fuel-filter-adapter.201506/
Ambac M-50 Injection pump repair
Mep-002 003 Injector rebuilding
Several ultra low hour 002a's fully serviced and load tested
you dont have to look up here is what Ray 70 said,