3-Way Solenoid Valve (Exc. B2000): 626
Disconnect vacuum sensing tubes from 3-way solenoid valve and vacuum pipe. Blow through vacuum tube "B" shown in Fig 1. Air should escape through solenoid air filter. Disconnect electrical connector from solenoid and apply battery power to connector as shown in Fig 1. Blow through hose again; air should escape through bottom port. If valve does not respond as outlined, replace 3-way solenoid valve.