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Discussion Starter · #1 ·
My M series just started leaking oil from the oil fill cap vent hole. I replaced the cap, the foam and the gasket however it still leaks. It's almost as if the oil tank is being pressurized. I have removed and cleaned the oil lines, the oil pump and the oil injection plate and the issue persists. The engine turns the oil pump and the governor control's how much oil is injected into the intake. Pretty simple system but I am stumped.

I know converting to premix and bypassing the oil injection is an option. I like the oil injection and I want to keep that way if I can. Any ideas?
 
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