i recently bought my papaws old truck back-73 f250,360 2bbl, 4 speed.i cleaned the gas tank,new sending unit,new fuel pump,kit in carb and a new clear fuel filter.heres the problem,everything seems to be working,filter filled with fuel,plenty of pressure,BUT,if you fill the carb bowl with fuel and a little down the carb it runs for about a minute and dies like its out of fuel?