YS 140DZ Fuel System

[Alan Simmonds]

Can anyone explain how the fuel system operates on the YS 140DZ? The
pump seems fairly straightforward (pumping fuel from the tank to the
carb) but beyond that it gets a bit fuzzy.

Is the pipe between the regulator and the bearing housing there to pulse
the regulator or to bleed fuel off to lubricate the bearings (or both)?
 
The pipe from the carb to the head must be the fuel supply (hence Direct
Injection), yes?  If this is so, is any fuel at all drawn into the
crankcase to lubricate the bottom end?

I would appreciate your help.
 
Kind Regards
Alan Simmonds
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