I have a US Stove 6041 multi-fuel stove and am wondering if anyone could tell me if the outside air pipe has a cap over it inside the burnpot that needs to be taken off. My stove does not seem to be drawing any air and I took the side cover off the stove and the pipe that I hooked to has a cover over it. It is right under the ignighter. If anyone has an answer, please let me know.