My Z force 50 will not start. The last time I used it I had to pour a little fuel in the carb to start it and it ran fine. I went to crank it yesterday and it will not start. No fuel to plugs they are dry after many winds of the starter. I replaced the fuel pump and still nothing. You can put fuel in the carb and it will start and run as long as you pour fuel in there. Any ideas on what it may be?