I have a 2000 Cherokee Sport with 218K. I love this thing. It is the greatest truck.

I have had a problem where it seems as if it is pushing pressure back through the gas cap. Whenever I open the cap, it pushes out hard. I can't figure out what is going on.

Can anyone help?

 

It sounds like an evap problem, I have an evap leak in my xj that I still haven't looked into. Maybe it's about time to look into lol