On my Husqvarna 385 the fuel tank vent started to leak. When I removed the tank vent The white plastic tube that goes into the tank came out with almost no effort. I had bought a new tube and elbow that goes into the tube. When I put the new tube into the tank it went in again with almost no effort. Even with the new vent tube in it is still leaking fuel. My question is, is there some kind of sealer I can use on the tube to stop it from leaking fuel? Thanks in advance ROB