Instead of mounting it perfectly vertical, I have always either had it at 90 degrees (to the side) or 45 degrees from perfectly inverted. This has always prevented the situation you discuss and alleviates the worries of the tank fuel height.
Hi all,
>
>I have an OS 91 4 stroke that I mounted inverted in a Spitfire. If I lean
>the engine down so that it will run, it runs very hot (too hot). If I turn
>the needle valve out, even a couple of clicks, the engine will die. I think
>it dies because the fuel is flooding the glow plug. If I leave the glow
>igniter on, it will keep running on the rich setting but it stalls the
>second I remove it. Is this normal? What can I do?
>