Hi nk3t
I'm one of those who believes that the Hayes tanks is the best thing since sliced bread. The O-ring seal is what sold it for me. When I was working as a Mechanical Engineer I designed hundreds of applications for O-rings and was always impressed with the simplicity and reliability. On the Hayes tank nothing is machined so there could be a quality problem. Did you always use the Vaseline on the O-ring that is recommended in the installation instructions? I used the Sullivan tanks for over 10 years. One day I was having engine run problems and noticed the large white Sullivan rubber plug was shredding and coming apart. Little bits of white rubber were all over the place, including the carburetor. Apparently age and fuel had attacked the white rubber. I immediately threw out every Sullivan tank I had and replaced it with the Hayes tank. I think some of my Hayes tanks have been in use for over 5 years. I have taken the time to give you a detailed report on my experience. I would like to read your story. Thanks for reading mine.