Fuel Hoses Lines/piping And Fittings problems of the 1997 Mitsubishi Eclipse

I purchased my 97 Eclipse sypder convertible in June 04. After 3 months the check engine came on. Diagonosed as small evap leak code 0442. Took to dealer. The fuel cut off valve is cracked and the vapor hose is separated (has a leak) parts are on order and total cost $475. 00. How can a valve crack and a vapor hose have a leak? are these parts defective? please note that I was told that if I was in an accident, the car would explode because of these 2 problems. I purchased my vehicle at desert Chrysler Jeep, here in las vegas, nv, 702-457-0293. When I called them about this, the service department referred me to courtesy Mitsubishi. I have provided that info on the dealer information page.