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The search function is your friend. Torque spec is 65-70 ft-lbs.
See copper washer above.
https://www.steelsoldiers.com/threads/hydraulic-head-leaking-need-advice.52223/
You are right about this plug not having any sealing washer. A common jungle fix, when they leak, is to put a copper crush washer underneath. Good that cleaning and re-seating stopped the leak.
As the name suggests, there is a plunger underneath this plug. If your truck won't start and the fuel...
Beyond, there are 4 ways fuel can make its way into the crankcase. The HH is one of them.
https://www.steelsoldiers.com/threads/making-oil.177206/
If you replaced the IP completely, you also replaced the booster pump, so you can likely eliminate that as the source. Flame heater, FDC?