2007 YAMAHA XF50 Fuelpropulsion System Problems

I PURCHASED MY YAMAHA C3 SCOOTER IN MAY 2007 AND IT OPERATED FLAWLESSLY UNTIL THIS SUMMER. IN HOT HUMID CONDITIONS THE SCOOTER STALLED-OUT OR WOULD NOT START. INITIALLY, I THOUGHT IT MIGHT BE RELATED TO THE SUMMER BLEND OF FUEL, BUT THEN IT OCCURRED TO ME THAT IT HAD RUN FINE IN THE SAME CONDITIONS THE PREVIOUS FIVE SUMMERS. THE SCOOTER'S MALFUNCTION WOULD CAUSE THE IT TO QUIT RUNNING WHILE IN THE MIDST OF TRAFFIC WHICH CAUSED POTENTIAL RISKS OF BEING STRUCK. WHEN I WAS ABLE TO GET TO THE SHOULDER OF THE ROADWAY THE SCOOTER CAUSED A RISK TO OTHER MOTORISTS SINCE IT WOULD NOT RESTART FOR SEVERAL HOURS. I TOOK THE MACHINE TO A YAMAHA DEALER AND WAS TOLD THAT THERE HAVE BEEN A NUMBER OF SIMILAR COMPLAINTS THIS YEAR FOR THIS PARTICULAR PROBLEM. YAMAHA TECHNICAL SERVICES ADVISED THE DEALER THAT THE PROBLEM WAS WITH THE FUEL PUMP....