Welcome to JustAnswer, my name is XXXXX XXXXX X'm here to help get your problem solved. The fuel tank needs to be removed which is why this job is expensive because it is somewhat labor intensive. The rollover valve is on top of fuel tank and if the car rolls over the valve closes so fuel cannot leak into the evap system. If your not trying to spend money now this problem is only emission related and will not effect performance or driveability. It is about a 3 hour job labor which is typically around $300 then the part is around $200 so the quote he gave is fair. Here are replacement instructions so you can see exactly what he will need to do. Let me know if you have questions or if there is anything else I can do to help. Thanks.
Just what I needed to know! Thanks so much.
One quick question... Is the "rear EVAP fuel tank pipe" the same as the fuel tank filler hose? Or is it actually the fuel tank vapor hose that connects to the evaporative emission canister?