The supply is external, but the injectors can leak into the combustion chamber and run past the rings into the crankcase.
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The supply is external, but the injectors can leak into the combustion chamber and run past the rings into the crankcase.
But isn't it likely fuel leaking past the injectors into the cylinder is going to burn, wheras fuel leaking from the heads, ends up in the crankcase via oil return galleys?