make sure the exhaust is also empty of fuel..

One of my old helicoptors was a bastard for flooding and you'd have to take the glow plug out and exhaust off to drain the cylinder and exhaust before it would go again..

I presume that it was running before without a HG in it. If it's designed to have one then so long as it's sealed then it will only raise the comp a bit, should not stop it running..

I think most of the above suggestions should get you going..

hth