NHTSA Complaint #10608947 — 2007 MAZDA CX-7

TIMING CHAIN REPLACEMENT RESULTED IN A CATASTROPHIC FAILURE OF THE HIGH PRESSURE FUEL PUMP AND ITS HOUSING. REPLACING THE TIMING CHAIN RETURNED THE ENGINE TO PRODUCTION LINE SPECS, THAT WERE TOO MUCH FOR A WORN FUEL PUMP TO HANDLE. THE INCREASED PRESSURE TO THE FUEL PUMP SHATTERED IT INTO NUMEROUS PIECES LESS THAN 100 MILES AFTER THE TIMING CHAIN WAS REPLACED. SAID PIECES BECAME LODGED INSIDE THE CAM SHAFT AND ENDED UP BENDING ALL OF THE VALVES. THE NECESSITATED A COMPLETE VALVE JOB, REMOVING AND REPLACING THE CYLINDER HEAD, FUEL PUMP, CAM SHAFT AND OIL CONTROL CALVE. AT WORST, ALL TIMING CHAIN REPLACEMENTS SHOULD REQUIRE A FUEL PUMP CHANGE IN ORDER TO PREVENT THE SEQUENCE OF EVENTS THAT HAPPENED TO MY CAR AND THOUSANDS OF OTHERS. *JS