Originally posted by DBCherry
But I ALWAYS run my engines dry. Our fuels are hygroscopic, meaning that they pull moisture from the air. Leaving fuel in the engine will cause the internal components to rust or corrode.
Hate to say it, but I feel you are doing more damage running the engine dry than just leaving the fuel in. I have never run them dry, and have never had to replace a bearing. I have friends that run them dry and oil them after every flight and they are always changing bearings. Would you drain the oil in your car, and then start it to make sure it is all out?
I leave the fuel in, and have never had an engine rust. Been using some for 25 years. I do use marvel if I am going to store it though.