Join Date: Oct 2006
Location: Evansville, Indiana
I have a Wolfman that covers the cap and have never experienced this. I have one of those whistling caps, maybe that is what keeps mine functioning. In case you don't know what I mean by whistling, some caps do it some don't and it's also random. Just a fairly quiet whistle like it's venting or something. Could last one minute or five minutes.
I've never looked closely at the cap, but I'm sure somebody on here or on net has and maybe knows about a small vent hole or something that could be plugged up.