I have a Yanmar 240D with a front end loader. I installed a new control valve for the fel and the pump started leaking fluid from the cover. I purchased new O rings and now the pump will not pump. The lift or the fel will not work. Checked the strainer and refilled with new oil. Has anyone had this problem? Would hate to purchase a new pump if that is not the problem. Have had this problem occur in the past and it went away. Was wandering if there is a trick to getting the pump primed.