Ford Transit 2002 Owner's Manual page 843

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The fuel metering valve closes the feed to the high pressure chamber during overrun.
This causes an increase in pressure in the feed and return bores. If this pressure reaches a
value of approx. 6 bar at approx. 2500 rev/min, the pressure control valve opens. The
pressure control valve is connected to the transfer pump by a bore.
The excess fuel partly flows back to the suction side of the transfer pump, and back into
the fuel tank through the venturi nozzle in the fuel return.
Description
1 Position of pressure control valve
Fuel
return
2 Return bore
during
3 Feed bore, high pressure chamber
acceleration
4 Leak-off fuel from the injectors
Fuel return to tank
High pressure channel to common rail
Transfer pump
Fuel feed
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