ShyT,
One good piece of aviation advice given to me many years ago: "Think what the Board of Inquiry might have to say about it". These days I would also add a rider: "And the insurance company".
I suppose that would only apply if the accident was fuel related. Clearly if an accident was cfit for example, and the engine was running perfectly, then surely it would not be a factor.
One of my engineers tells me three of his gazelles and two of his allouettes have been running on heating oil for years with no problems.