Passive Misfueling Protection Device
| ITEM | DESCRIPTION |
|---|---|
| 1 | Filler neck insert |
| 2 | Shut off flap |
| 3 | Reset slots |
| 4 | Spigots |
| 5 | Reset tool |
| 6 | Spring |
The passive misfueling protection device system comprises a mechanically operated shut off flap. This shut off flap is triggered when the smaller diameter fuel filler nozzle tube, used on petrol (gasoline) pumps, is inserted in the fuel filler neck. The shut off flap is actuated and blocks the sensor port on the fuel pump nozzle, causing it to automatically switch off. The shut off flap is locked in this position by a latch mechanism, once it has been activated.
The reset tool is used to reset the misfueling protection device if triggered. The reset tool is inserted into the filler opening as far as possible with the spigots pointing upper most. Once the two spigots on the reset tool are located in the slots it can be pulled outwards, releasing a latch. This method allows the shut off flap to be opened by its own spring pressure.
The shut off flap is colored yellow so that it is clearly visible within the entrance of the fuel filler pipe when activated. The shut off flap has a 'handbook' symbol on it.
A 25 mm diameter diesel fuel pump nozzle will not activate the misfueling protection device because the nozzle stops against two molded tabs. The tabs are located on the inner side of the misfueling protection device. However, if a 21 mm diameter unleaded gasoline pump nozzle is inserted into the housing, its smaller diameter allows it to pass the two molded tabs. The nozzle strikes two pins on the inside of the filler housing which move forward. This movement rotates the shut-off flap which is then held in place when the nozzle is removed by the latch mechanism.