Setting Pump Timing screw

THE PUMP TIMING SCREW- USUALLY THE GAP PICTURED IS ABOUT 2.6-2.8MM, BUT CAN VARY. TURNING THE SCREW INWARDS 1/4 TO 1/2 TURN WILL DELAY THE PUMP START, BUT ALSO ENSURES THE PUMP CAN REFILL COMPLETELY WHEN THE THROTTLE IS CLOSED. IF THE PUMP CAN'T F