Service engine light on

I have a 2000 regal with the service engine light on. I had it checked many times and it comes back that the cap on the gasoline is not right but when I do what they tell me to do it still comes. One tec told me there is a hose that goes from my gas cap to the tank that might not be working right.
Does anybody know what they are talking about and how to fix it?

Which specific evaporative emissions diagnostic trouble code is it?

Which specific evaporative emissions diagnostic trouble code is it?


I have never asked but I had it check about 10 times and every time the tec tells me the gas cap is not tight. I bought a new cap but same problem. They tell me make sure I get the three clicks when I put the cap back on.
Any ideas?

Here is a thread that gives some detail on the gas cap code. Probably P440 which is large leak detection.

http://www.automotiveforums.com/vbulletin/showthread.php?t=622473