Comanche 2WD L6-242 4.0L VIN S MFI (1992)
Evaporative Check Valve: Testing and Inspection
NOTE:
This vehicle is equipped with two pressure relief/rollover valves. These dual function valves relieve fuel tank pressure and prevent fuel flow
through the fuel tank vent lines should the vehicle be rolled over. To test the valve perform the following procedure.
PROCEDURE
1.
Inspect fuel and vapor hoses for proper routing, cracks, or restrictions.
2.
Inspect fuel tank cap for proper seal and fit.
3.
Remove fuel tank vent hose from EVAP Canister. Apply light air pressure (3-6 psi.) to the Fuel tank filler tube. Air flow should be present at fuel
tank vent hose. If air flow is not present, and Fuel Tank is not over-full, replace Pressure/Relief Rollover Valve.
