This is a Recall that was just issued. I had a gas leak and while i was searching prices i came across the recall and called the mitsubishi 800# it's a free repair due to the recall because its actually the pipe thay rusted out and its a fire hazard. if you haven't fixed it call asap. if you have then call anyway and they may re-imburse you the cost to replace it. Hope this helped
If its just the rubber fill hose and not the metal portion, you can purchase the hose material at a Napa auto parts store just tell the count person to come out and look at the hose you need and they will measure the diameter and cut it for you, but if you need the metal portion it will only be available from the dealer, If you need a shop to do this maybe try a napa auto care center
This is a factory recall. I got a letter in the mail about it from Mitsubishi last week. Just make an appointment at a Mitsu. dealer and they will first check a serial number to see if your vehicle needs the part replaced. If it is determined that you do, they will replace at no charge.