Pretty sure the system needs electrical control over the fuel pump - its one of the reasons I might not fit an OM603 pump to my OM606 engine as you lose some functionality.
Did you think the cruise control would work after you disconnected the ECU control from the fueling??
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UK spec Mercedes W210 E300 Turbodiesel wagon - OM606.962 with 722.6 transmission - rust free!
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