had not much time to work on the SD lately. See/listen here:
Today I got it run. The engine runs almost perfect !
The only problem was the fuel taps. At "RES" they did not deliver gas - seem to be stuck with debris. That was the reason for the engine starting to bang - no gas ......
At "ON" position the fuel taps work fine as long as the fuel level is high enough

Btw - it was not necessary to change a gasket or a manifold flange - everything works fine and is tight ! But I need to replace the fuel taps - no big deal.
Cheers
Joe
http://www.youtube.com/watch?v=GsnmKxuQs5o