What kind of fuel tank do you use in your car? I dont know about cars, but fuel tanks in planes have a small length of pipe with a wieght at the end so they can run even when upside down.

You may already have one of these, but I thought Ill mention it anyway.

I also know that Kyosho and some other brands sell complete sets with an engine, starter motor and glow starter. Just plug in a battery pack and the engine starts itself.

Of course youd need an extra channel to be able to this be remote control.