Evaporative Emissions System: Testing and Inspection

Evaporative Emissions Control Schematic:

Vapor Canister And Hose Routing:

VISUAL CHECK OF CANISTER

^ Cracked or damaged, replace canister.
^ Fuel leaking from bottom of canister vent hose, replace canister and check hoses.
^ Correct hose routing.

CANISTER CHECK

^ Apply a short length of hose to the bottom port of the canister, and attempt to blow through it. There should be no restriction of air through the canister and out the top two ports. If there is a restriction the canister is faulty and should be replaced.
^ Apply the short length of hose to hose "B." Air should not pass through the canister and out hoses "A" or "C." If air passes through canister is faulty and should be replaced.

Two Way Check Valve:

TWO-WAY CHECK VALVE CHECK

^ Remove Two-way check valve.
^ Attempt to blow through it from fuel tank side (BLACK side of valve) to the canister side (orange side). Air should pass but not easily. When blowing from orange side air should pass easily.
^ If the valve does not operate as indicated replace two-way valve.