Testing and Inspection for Fuel Tank Vent Component on GTI V6-28L (AFP) (1999)
Fuel Tank Vent: Testing and Inspection
Fig. 3 Checking the pressure valve
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Check the valve flow:
A) Orifices 1 - 1:
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Flow in both directions, port 2 closed
B) Orifices 2 - 1:
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Flow in both directions, port 3 closed
C) Orifices 1 - 2:
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Flow in one direction, port 3 closed
The valve will close when there is vacuum at opening 1.