Fuel Hoses Lines/piping And Fittings problems of the 2003 Volvo XC70

1) while my 2003 Volvo Xc70 was parked in the driveway noticed that there were two pipes that were hanging low on the car which was new. Car was taken to the dealer and was told that it was the fuel lines and they had come loose. The car is used only for local and highway driving, so it is unclear why the fuel line was loose. 2) if the fuel line had caught on something there could have been a fire an/or explosion. Because of the location of the fuel lines under the car it is hard to notice in everyday use if it is in the right place. 3)the dealer reattached the fuel line at out cost even though car is only 2 years old.