[HardcoreZ28]

Try tightening it more.....put a wrench on the filter as well if you didn't. No need for sealant on that and the fitting shouldn't wear out. Is it possibly stripped? If it's the same as a thirdgen inline filter then replacing the fitting (if you can get one) would require cutting the end off the line, slipping the fitting over, and reflaring it....and you may end up short then.