See Figure 1
The Emission Control System (canister and hoses) should be inspected every 30,000 miles or 24 months to inspect system make sure that all vapor hose connections are tight. Check that vapor hoses are not cracked. Replace any brittle or broken vapor hoses. No further service should be necessary.
A carbon filled canister stores fuel vapors until the engine is started and the vapors are drawn into the combustion chambers and burned. To check the operation (if necessary) of the carbon canister purge control valve, disconnect the rubber hose between the canister control valve and the T-fitting, at the T-fitting. Apply vacuum to the hose leading to the control valve. The vacuum condition should be maintained indefinitely. If the control valve leaks, remove the top cover of the valve and check for a dislocated or cracked diaphragm. If the diaphragm is damaged, a repair kit containing a new diaphragm, retainer and spring is available and should be installed.