Evaporative Emissions System: Testing and Inspection

FUEL VAPOR LINES, FUEL TANK AND TANK CAP INSPECTION




1. Visually inspect lines and connections.
Look for loose connections, sharp bends or damage.
2. Visually inspect fuel tank.
Look for deformation, cracks or fuel leakage.




3. Visually inspect fuel tank cap.
Check if the cap and/or gasket are deformed or damaged.
If necessary, repair or replace the cap.

EVAP CONTROL SYSTEM INSPECTION

1. Inspect VCV operation with cold engine.
(a) The engine coolant temperature should be below 45°C (113°F).
(b) Disconnect the EVAP hose from the union pipe.
(c) Start the engine.



(d) Gradually increase the engine speed from idle to 3.000 rpm and check that air suction is not felt at the union pipe.

2. Inspect operation of VCV with hot engine.
(a) Warm up the engine.



(b) With the engine idling, check that air suction is not felt at union pipe.




(c) Gradually increase the engine speed to 3,000 rpm and check that there is air suction at the union pipe.
(d) Reconnect the EVAP hose to the union pipe.
If no problem is found with this inspection, system is normal: otherwise inspect each part.