I just bought this machine secondhand and when I tried to fill it with petroil it leaked. The fuel leaks from a hole in the tank next to where the fuel hose comes out. I saw a YouTube video for a Model 340 and that has a nipple and return hose in addition to the fuel feed to the carb. Should my machine have this nipple and hose? If so, can I renew the nipple part or do I need a whole new tank?