As the title says the 2 stroke oil pump is not working. I reassembled the engine about a year ago and the pump worked fine I primed it by undoing the big nut on the end and kicked it over a few times and oil poured out. Now however I cannot get any oil flow through the pump. I have even run the motor for short spells so that the pump turns faster but still it doesn't work. I took the pump off but I could not see anything obviously wrong although I am not exactly sure what I am looking for. Any thoughts?