After installing my power commander and after four fill ups I have been having problem opening my gas cap. Two times when I fill up when my fuel gauge is at one bar and I try to open up the gas cap, I feel a suction and when I do open it up a blast of air comes out. And the other two times when my gas gauge is blinking when I put the key in to open the gas cap, the cap cant come out or it wont even pop. I had to use the key as leverage to pull the cap open and even that the gas cap wont come out. I had to use the key and the cover for the key hole to pull the gas cap out and when I do that it comes out really slow. Any ideas.