Valve Test
- Ensure fuel tank is less than half full. Remove fuel filler cap. Remove left rear inner fender. Disconnect fuel tank vapor signal hose. See Fig 1
or Fig 2
. Disconnect vacuum hose from EVAP canister, then plug ports with plugs. Connect vacuum pump/gauge to EVAP canister vent shut valve port. See Fig 3
or Fig 4
. Apply vacuum with vacuum pump/gauge (80 pumps). If vacuum holds, go to next step. If vacuum does not hold, go to step 3
.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
- Connect a second vacuum pump to fuel tank vapor signal tube. See Fig 1 or Fig 2 . Apply vacuum with vacuum pump (1 pump). Check vacuum reading at vacuum pump/gauge used in step 1). If vacuum holds, replace fuel tank vapor control valve. See EMISSION SYSTEMS & SUB-SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION article. If vacuum is released, fuel tank vapor control valve is okay. Go to step 4 .
- Disconnect fuel tank vapor quick-connect fitting from EVAP canister. Cap port on canister. Reapply 80 pumps of vacuum with vacuum pump. If vacuum holds, replace fuel tank vapor control valve. See EMISSION SYSTEMS & SUB-SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION article. If vacuum does not hold, check EVAP canister vent shut valve "O" ring. If "O" ring is okay, replace EVAP canister and go back to step 1 .
- Fill fuel tank with fuel. Check for fuel in hoses at 2-way valve and fuel tank vapor recirculation hose. See Fig 5
or Fig 6
. If fuel runs out of hoses at either location, replace fuel tank vapor control valve. See EMISSION SYSTEMS & SUB-SYSTEMS
in REMOVAL, OVERHAUL & INSTALLATION article. If fuel does not run out at either location, the fuel tank vapor system is operating normally.NOTE: Tiny droplets of fuel at either location is normal.