David, I agree with Hartmut. I had a siimilar problem with the 9 gallon tanks. Visual inspection of the caps appeared ok. I blew the vents out with compressed air and the problem was solved.
Fred
David, I agree with Hartmut. I had a siimilar problem with the 9 gallon tanks. Visual inspection of the caps appeared ok. I blew the vents out with compressed air and the problem was solved.
Fred