I have been working on several suggestions from RCU members on how to start my O.S. 91 pumped engine...It takes a lot of starting with an electric starter and full open throttle to just get the fuel from the carburator to the engine... The pump starts pump quickly but the fuel flow seems to stop at the regulator... My question this time is can I adjust the pressure regulator that is attached to the carburator..? There is a slot that a screw driver will fit and it does turn... Is this a way to adjust pressure from the pump? If so.. which way should I turn the slot to increase pressure? or should I not try to make any adjustments at the regulator? Thanks