Originally Posted by
cmulder
So its not that the regulator is opened and closed by the crankcase pressue.
And then if the regulator is open it passes the fuel while solenoid is closed, the solenoid will "see" the fuel tank pressure and block that so no fuel is passed to the carburator.
Close or do i overlook something?
That is the YS regulator system... what Chris is building and what Walbro and Stihl use, works differently. Those regultors do not sense crankcase pressure but basically atmospheric pressure, and they keep thepressure in the fuel line at a fixed offset from atmospheric. As soon as the engine starts consuming, the regulator opens to maintain that set pressure.