Air Injection Pump: Testing and Inspection

1. Disconnect air pump outlet hose from bypass valve or air control valve.

Fig. 5 - Air Pump Test:

2. Connect a tee fitting in the outlet hose and connect a pressure gauge to the tee fitting. Also, insert a plug with a 11/32 inch hole in the remaining port of the tee fitting, Fig. 5.
3. Start and run engine at 1250-1500 RPM. Ensure the choke is fully open.
4. Check pressure reading. If below 1 psi, replace the air pump.