Stock accelerator pump covers permit only a 60% - 70% fuel charge in the pump chamber. Turn the throttle and air trapped in the chamber is compressed disrupting fuel delivery. All the while tuning the squirt means a complicated change of the leak jet. The Result: Hesitation, bog and a tuning headache. The Patented Boyesen QuickShot 3's triple effect: (1) Completely fills the pump chamber with fuel (2) Eliminates troublesome air and (3) Provides an adjustable leak jet circuit for simple hand tuning. The Result: The ultimate in adjustable fuel injection. Tunable leak jet maximizes volume of fuel and duration of squirt for all conditions. Investment-cast and finished to precise tolerances. 25% more fuel capacity. High-volume vertical check valve located in the QS3 for precise, consistent fuel metering. Stops hesitation and bog. Instant throttle response.