I have a 06 TRX 250 EX that will not run unless the fuel valve is in the reserve position. When I take the tank off, fuel will not drain unless in the reserve position. I am relatively new to all of this, but I assume that if fuel is not draining when in the on position, there is no way the engine can run. Any ideas on what the problem can be?

 

i would say theres something in it...........run the tank dry and blow some air through the pedcock