I was ask if I could fix two 96 Tigershark Montegos. I can not get them to prime. I mix up a small bottle of pre mix and as long as I pour it into the carb it runs. But will not stay running. When I pull the fuel line off from the carb. I can blow into it no gas nothing. Any ideas how to get these things to run without pouring gas in the carb?](*,)](*,)](*,)