i've previously had an identical problem to this wiring etc. & all on a fiesta, spent most of the time repairing the "repairs" made to try to get it going by the guy who'd put the engine in, there's a choice of 3 cam sensors that fit to these,(also had the debris of 3 engines) when everything else was sorted we had no rail pressure, i checked the pump output directly using the delphi sealed rail kit, replaced the quantity adjuster?( round silver screw in component) on the pump (struggling to recall, it was last year) & had 1500 bar again, job done, what a nightmare cleaning up after someone else though!

Steve