Main Metering, Power and Pump Systems

Cutaways of the main metering system (main nozzle, main well, main well air bleed, metering jet, boost and main venturi, plastic main well insert), the power system (Fig. 13: power piston, power valve, spring, power restriction, vacuum break) and the accelerator pump (plunger, duration spring, discharge and inlet check balls, pump jets). Page 17 is a faint, nearly blank scan.

What this section covers

• Main nozzle, main well and metering jet
• Boost and main venturi
• Plastic main well insert
• Power piston, spring and power valve
• Pull-over enrichment fuel feed
• Accelerator pump plunger and check balls