Do what Mettler says and get the idle setting perfect. Then things will work great. Don't worry about the siphoning or the muffler - those aren't your trouble.

To prevent hydrolock: before starting, turn the plane up on one wingtip so that the muffler is down and any fuel/oil will run out of the engine into the muffler. Flip the prop a few times to flush out the engine, then turn the plane nose up to let the gook run out the exhaust and drip on the ground.

Set the plane on it's wheels. Prime the engine (thumb over carb and flip a couple times) then hook up the glow and it SHOULD start right up if you back-flip the spinner - no starter required.