Pressure Ventilation Valve
WARNING: This page is about a different car, the 2011 Jaguar XKR, 2011 Jaguar XK, 2010 Jaguar XKR, and 2010 Jaguar XK. However, it is still accessible from the selected car via links, so may be relevant.
 Courtesy of JAGUAR CARS, INC.
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The PVV is installed in the pipe between the pump module and the mounting flange to protect the system from excess pressure. The PVV releases fuel back into the tank if pressure in the pipe increases to 7.3 to 8.3 bar (105.9 to 120.4 lbf/in.2
).