Stuff like that with pipe threads will leak if not sealed right. Watch any pipe fitter. I think I went through this with a boat I had. Certainly taught me to check anything out that I did. Especially to the fuel system. You haven't lived until you've seen a race car, coming off the track towards your brand new car, which is sitting on the return road, without you in it, with 15ft. flames engulfing the whole front end! I jumped in my car and split!