Fuel Bowl Vent
- Apply parking brakes and block wheels. Remove air cleaner. Remove bowl vent hose from canister. Check fuel bowl vent solenoid for external damage and electrical connections. Attach a Rotunda T75L-9487-A tool or equivalent to end of canister hose.
- Turn ignition switch off and hold choke plates open. Force air into fuel bowl vent system by squeezing tool's rubber bulb. If no fuel is displaced through metering system, start engine and run for 2 minutes. Turn off engine, and repeat test.
- If fuel is still not displaced, remove test lamp and reconnect solenoid electrical lead. Remove carburetor air horn. Switch ignition on and off. Solenoid plunger should retract when switch is on and extend when off. If so, replace bowl vent plunger seal. If not, replace solenoid, plunger, seal and plunger spring. Reassemble carburetor.
- With ignition switch on and tool still connected, again force air into fuel bowl vent system. If rubber bulb resists rapid squeezing (pressure build up), bowl vent is working properly. If not, disconnect electrical lead to bowl vent solenoid and connect it to test light. Ground second test light lead.
- Turn ignition switch on. If test light does not glow and battery is okay, solenoid lead has an open circuit. Repair or replace. If light glows, remove test light and reconnect lead to solenoid. Remove all test equipment and reassemble all components. Install air cleaner and check all hose connections. Start and run engine at 2500 RPM for 15 seconds and turn off engine.