Are you talking about the in tank, or in line filter? I don't see how an in tank could cause an air leak, but I supose an in line could. After all it has a seal, and two ends the fuel line connects to that potentially could leak, but I don't think this is a common problem to worry about. I have one, or both in all of my vehicles, and have never had any problems with air leak from them. Just my $0.02