NHTSA Engineering Analysis EA07006

GM IS RECALLING (NHTSA RECALL NO. 07V-349) CERTAIN MODEL YEAR (MY) 2002-2004 BUICK RENDEZVOUS, CHEVROLET VENTURE (REGULAR WHEELBASE) AND 2001-2004 PONTIAC AZTEK AND MONTANA (REGULAR WHEELBASE) VEHICLES TO REPLACE FUEL TANKS AND CORRECT A DEFECT THAT MAY ALLOW FUEL LEAKAGE.THE VEHICLE RECALL POPULATION IS RENDEZVOUS AND AZTEK VEHICLES BUILT IN MAY 2003, VENTURE AND MONTANA VEHICLE BUILT IN JUNE THROUGH AUGUST 2002 AND CERTAIN SAME MODEL VEHICLES REGISTERED IN NEVADA, ARIZONA, VIRGIN ISLANDS, PUERTO RICO AND HAWAII THAT WERE BUILT THROUGH NOV/DEC 2003 (DEPENDING ON MODEL).THE TOTAL NUMBER OF VEHICLES RECALLED IS 20,594 (INCLUDES 15,196 SUBJECT AZTEK AND RENDEZVOUS VEHICLES). IN ADDITION TO THE RECALL, GM WILL EXTEND THE WARRANTY ON MY 2002-2004 RENDEZVOUS AND REGULAR WHEEL BASE VENTURE VANS AND MY 2001-2004 AZTEK AND REGULAR WHEELBASE MONTANA VANS NOT INCLUDED IN THE RECALL TO PROVIDE WARRANTY COVERAGE FOR A PERIOD OF 10 YEARS OR 150,000 MILES, WHICHEVER OCCURS FIRST.GM WILL BEGIN NOTIFYING OWNERS IN DECEMBER 2007.GM REPORTS THAT THE FUEL INLET PIPE CONTAINING THE INLET CHECK VALVE (ICV) MAY FRACTURE AND ALLOW FUEL VAPORS OR FUEL TO LEAK OUT.GM DATA REVEALED THAT ELEVATED AMBIENT TEMPERATURES, HIGHER CARBON CONTENT IN THE ICV AND VARIATION IN THE MANUFACTURING PROCESS WERE THE CONTRIBUTING FACTORS FOR POTENTIAL CRACKS IN THE ICV.BEGINNING DECEMBER 2003, GM BUILT VEHICLES WITH A REDESIGNED FUEL TANK/ICV.SUBJECT VEHICLES NOT INCLUDED IN THE RECALL OR EXTENDED WARRANTY DID NOT SHOW A FAILURE TREND SIMILAR TO THE ABOVE VEHICLES..FOR ADDITIONAL DETAILS, SEE RECALL 07V-349.THIS INVESTIGATION IS CLOSED.