Always during start and during running when coolant temp under 19 C flow control valve is fully closed (max flow to pump, no leak off from flow control valve) and pressure control is done by pressure regulator at the rear end of fuel rail.
https://www.pss-autosoft.net/diagram..._FBDDE6RDR.htm
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E39 530dA -02 M-Sport Messing metallic
E53 X5 3.0dA -06 Sport Stratus grey
E70 X5 40d -12 M-Sport Space grey
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