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I think you'll find there is no 'Pressure control Valve'.
The system pumps against a metered orifice on the outlet of the fuel filter and dumps fuel back to tank via this .
VW and Volvo, Bosch diesel systems use the same orifice type pressure control.
You should find this hollow bolt on the filter head and on VW and Volvo on top of the i/p. The later is stamped, 'OUT'.
If there is one, I have never found it....although I must admit, I've never looked for one, being as I understood the above to be corrrect.
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