Refueling EVAP Vapor Cut Valve

With CONSULT-II

1. Remove fuel tank.
2. Drain fuel from fuel tank as follows:
   • Remove fuel feed hose from fuel level sensor unit (on top of fuel tank).
   • Connect a spare hose to fuel level sensor unit.
   • On CONSULT-II, select ACTIVE TEST mode, and then FUEL PUMP RELAY. Activate fuel pump and capture fuel. When fuel tank is completely drained, go to next step.
3. Check refueling EVAP vapor cut valve for being stuck by blowing air into refueling EVAP vapor cut valve from "B". See Fig 1 or Fig 2 . If air flows freely into fuel tank, go to next step. If air does not flow freely into fuel tank, replace fuel tank.
4. Check EVAP vapor cut valve for being stuck open as follows:
   • Connect vacuum pump to hose ends "A" and "B" using suitable 3-way connector. See Fig 1 or Fig 2 .
   • On fuel tank, remove fuel level sensor unit retaining ring. When reassembling always replace "O" ring seal with NEW part.
   • Place fuel tank upside down.
   • Apply vacuum pressure to hose ends "A" and "B". With fuel level sensor unit opening free, ensure that vacuum holds at 3.94 Hg (13.3 kPa).
   If vacuum does not hold, replace fuel tank. If vacuum holds, refueling EVAP vapor cut valve is okay.

Without CONSULT-II

1. Remove fuel tank.
2. Drain fuel from tank as follows:
   • Remove fuel level sensor unit retainer.
   • Drain fuel from tank using a hand pump.
   When fuel tank is completely drained, go to next step.
3. Check refueling EVAP vapor cut valve for being stuck by blowing air into refueling EVAP vapor cut valve from "B". See Fig 1 or Fig 2 . If air flows freely into fuel tank, go to next step. If air does not flow freely into fuel tank, replace fuel tank.
4. Check EVAP vapor cut valve for being stuck open as follows:
   • Connect vacuum pump to hose ends "A" and "B" using suitable 3-way connector. See Fig 1 or Fig 2 .
   • On fuel tank, remove fuel level sensor unit retaining ring. When reassembling always replace "O" ring seal with NEW part.
   • Place fuel tank upside down.
   • Apply vacuum pressure to both hose ends "A" and "B". With fuel level sensor unit opening free, ensure that vacuum holds at 3.94 Hg (13.3 kPa).
   If vacuum does not hold, replace fuel tank. If vacuum holds, refueling EVAP vapor cut valve is okay.

Fig 1: Testing EVAP Vapor Cut Valve & Refueling Control Valve (Altima)

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Testing EVAP Vapor Cut Valve & Refueling Control Valve (Sentra)

Courtesy of NISSAN MOTOR CO., U.S.A.