October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Tank Pressure Control Valve: I-Mark

Remove hoses and remove valve. Apply 1.1-1.2 in. Hg to intake manifold vacuum port and blow air into fuel tank port. Valve should open and allow air to pass through canister port.
Remove vacuum and blow through fuel tank port with canister port blocked. Air should pass through vacuum port. If valve does not perform as outlined, replace valve.

Fig 1: Testing Tank Pressure Control Valve (I-Mark)

Courtesy of ISUZU MOTOR CO.