Thanx a ton Gord, very helpful indeed.
By the pressure pipe, I meant the nipple on the muffler from which you connect tubing to the fuel tank. I do need to do that dont I?

One more question, once the engine is primed the way you suggest, how does the fuel get pulled from the tank once the engine starts? I have noticed that once the engine starts, it doesnt stop as long as it is straight and level.

Quietning it down is not that much of a concern as for it running properly.

Also, if there is no back pressure, how does the fuel continue to flow when the plane is in a dive or a steep climb i.e. 90 deg nose up etc?. Does getting the centre of the tank up level with the needle valve help with this? If i can't what else can I do?