Fuel Tank Vent: Testing and Inspection

Fig. 3 Checking the pressure valve







- Check the valve flow:

A) Orifices 1 - 1:
- Flow in both directions, port 2 closed

B) Orifices 2 - 1:
- Flow in both directions, port 3 closed

C) Orifices 1 - 2:
- Flow in one direction, port 3 closed

The valve will close when there is vacuum at opening 1.