System Test
- Drain gasoline from fuel tank and place fuel cap tightly on filler neck. Disconnect hose from canister and fuel delivery hose from pipe under the vehicle.
- Connect a water column manometer that measures more than 15.8 in. water to hose. See Fig 1.
- Apply compressed air into canister side of evaporation hose until manometer indicates 14.2 in. water. Air pressure MUST NOT exceed 2.13 psi (.5 kg/cm2
) during this test.
- System is functioning correctly if it takes 5 minutes or longer for water in column to drop 1.97 in. water.
Courtesy of SUBARU OF AMERICA, INC.