On my '04 400FA TRX rancher, this part started leaking. In a couple days if fuel valve not shut off it would drain the tank down to reserve. This primer pump or primer button was in accessible on my bike so I removed the two screws and made a rubber gasket to put in to stop the leak. My assumption was that I couldn't get to it to use so just plug it off. It worked leak stopped however now the bike is hard to start when cold?? Is there something I didn't know like vacuum operated or something. Fairly expensive part so I thought I'd ask before I order one. My maintenance manual not much help. Thanks in advance.