I am having a problem with my 1980 Yamaha g1. It seems to not be getting enough gas. I blew out the fuel lines in case there was any dirt in them and it didn't seem to fix the problem. If I choke it the cart will run but then it stops and when I wait a few seconds it will start back up and go about another 20 feet. I'm thinking it may be the fuel pump but I'm not sure. Does anyone have any advice for me on what the problem could be?