What was found
(CAN) RT ENGINE FUEL FILTER BY-PASS LIGHT FLICKERING AT TAKE-OFF CLIMB POWER SETTINGS. AIRCRAFT RETURN TO MAINTENANCE BASE, MAINTENANCE TECHNICIAN FOUND FUEL FILTER CONTAMINATED BY A LOTS OF FINE GREY SEDIMENT. IT WAS DETERMINED THAT THE ENGINE DRIVEN MOTIVE FLOW PUMP WAS DEFECTIVE. THE PUMP WAS REPLACED AS WELL AS THE FUEL FILTER, FUEL CONTROL UNIT, FLOW DIVIDER AND FUEL MANIFOLD NOZZLES. AIRCARFT RETURN TO SERVICE.