Evaporative Emissions System: Testing
Fuel evaporation control systems normally need no checking other than hose condition and tight connections. On carbureted models, operation of the anti-run on solenoid can be checked by applying 12 volts to the positive terminal of the solenoid while the engine is running. If the engine stops, valve is operating properly. If not, check valve, wiring, oil pressure switch and ignition switch.
NOTE:
If carburetor vent valve is not adjusted properly, air will bleed into float chamber and shut down engine even if valve is operating properly. For information on vent valve adjustment, see appropriate carburetor article in FUEL SYSTEMS Section.