1996 mule 2510,it sat for 4 or 5 years.There is only 150 hours on meter. I took carb off and complely disasembled. Soaked in cleaner and made sure all passages were clear. Now has new main jet, needle valve, gaskets on float bowl and intake. Fuel pump works it will fill bowl, but fuel will not pass thru carb while cranking engine. What else can I look to be wrong. If the valves are out of adjustment could this cause it not to suck fuel?