Refueling EVAP Vapor Cut Valve Test

Remove fuel tank. Remove fuel level sensor unit retainer. Drain fuel from tank using a hand pump. To check if refueling EVAP vapor cut valve is stuck closed, blow air into refueling EVAP vapor line. See Figure. If air flows freely into fuel tank, go to next step. If air does not flow freely into fuel tank, replace fuel tank.
To check if refueling EVAP vapor cut valve is stuck open, connect a vacuum pump with a "T" to signal line and refueling EVAP vapor line. See Figure. Remove fuel gauge/fuel level sensor unit. Invert fuel tank. Apply 3.94 in. Hg (13.3 kPa) of vacuum to signal line and refueling EVAP vapor line. If vacuum does not hold with fuel tank upside down, replace fuel tank. If vacuum holds with fuel tank upside down, refueling EVAP vapor cut valve is okay.