hi i recently converted a ryobi 31cc engine and cant get to keep it running long enugh to tune it.... i noticed that it dont suck gas i had to squert gas in the carb by sqeesing the fuel tank .... it runs then as fuel burns out of the line it go to hi rpm and dies ? can any one help please...... i have tryed every thing there is to try .... i was to a point where i need a fuel pump to keep pumping the gas out of the fuel tank to the carb.