I have a 95 Ski-Doo Formula Z 583. I am having troubles keeping it running. I bought it last spring and the guy I bought it from said he hadn't used it in a few years. When I prime it it starts right up will run for a bit and then dies. By pumping the primer every few seconds I can get it to idle but if I stop it just dies. It seems as though it is not getting any gas to the carbs. Has anyone experienced something similar or have any suggestions?