If you are having problems with the fuel running back into the tank, try this. use a few extra inches of fuel tubing. Arrange the tubing so it comes through the firewall, up to the top of the cowling, then back down to the engine fuel intake. This will help stop the gravity feed of the fuel. Ultimately, if you are going to fly glow, you will want a starter sooner or later. your going to get sick of flipping your flipping prop. :-) You can get a small 12v battery from you hobby shop or home depot. (used for battery backup of home alarm systems) about a 7 amp one will do nicely. the starters are only about $20 or so.