Fuel solenoid cold starting

[KUBOTA4900]

Hi im new to this site i hav a kubota 4900 n i need some help wen its cold i hav to hold key to keep it started i read something about a solenoid would changing it solve my issue it starts runns great other wise just wen its cold outside it will start up after holdin in glow plug posisition run but i must hold key in that posisitoin ??????????? Any help strongly appreciated


thank u all tony in durango colo