zanahade
i had a similar problem, bevmo was even willing to take the keg back. then i remembered that i cleaned the faucet. so i looked at the parts link on the faucet page and realized that i had switched the order of parts 15 and 16. check your assembly.
http://www.micromatic.com/draft-keg-...id-JESF-4.html
look at the tab marked replacement parts
worth a try.
P.S. i have used phx weld gas works gr8 for me.