Evaporative Emissions System: Testing and Inspection

NOTES:
- When vehicle rollover valve is in the inverted position the plunger is forced against the guide plate and raw fuel is prevented from flowing through the valve orifice into the fuel tank vent tube.
- This vehicle is equipped with only one rollover / pressure relief valve. This dual function valve relieve fuel tank pressure and prevents fuel flow through the fuel tank vent lines should the vehicle be rolled over. To test the valve perform the following procedure.

TEST DESCRIPTION
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 Evaporative Vapor (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.