Hmm, you might want to do a bit more research.
The DZ range is the ONLY model that has a fuel pump. This pump is located between a 2 piece push rod.
ALL other models use crankcase pressure to provide fuel pressure hence the one way valve. The rotary disc/valve is DEFINITELY NOT a fuel pump.
It is not even a pump of any kind. it is a valve. As the disc rotates, the timing of the port in the disc allows crankcase presssure through to th inlet. The solid side of the disc then blocks off the opening as the inlet valve is opened and the air/fuel charge is forced into the cylinder. This is the supercharging effect.
The pressure for the fuel system is tapped off a seperate line from the crankcase.
Last edited by drac1; 11-30-2013 at 07:29 AM.
Reason: Accuracy.