need a hand. 85cb450 nighthawk. was not getting fuel to the carbs. I thought petcock as the was no flow when it was turned to the on position. I purchased the rebuild kit and carefully installed it. Still nothing. I also attached a funnel to the carb fuel line, 1/2 cup of gas & it ran just fine. My question is should fuel flow free from the petcock when turned on or do the carbs suction it out? Not much experience with the older ones. Thanks!