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There are check valves in the pumps that can be clogged or held open with debris. Check the first pump inlet check valve, if it is leaking, it won't pump.

Oil pressure takes a few seconds to build, especially after an oil change. If it doesn't go to 15 psi after ten seconds of running, then shut it down. When the master switch is in the start position, oil pressure shut off is bypassed. Now, on really new units, the governor fly balls are...