RE: Jett Boubbless tank
You use a syringe, its called a Jett Tanker on their website. You put about 6 oz of fuel in the Syringe and hook up to the tank. Pull all of the air out of the fuel tank and it will bubble up through the fuel in the syringe. Once you have it completely empty push the fuel into the tank until it is full. Keep the back end of the tanker point up so you are just pushing fuel into the tank. Clamp off the fuel line and unhook the tanker. When you are ready to fly, unhook the fuel line clamp and start it up.