I ma having trouble with my oilreservoir. After runnnig the engine, I found a lrge 2 cycle oil spot underneath my drain plug opening. Upon inverstigting the source, I found the oil coming out of thtop ov the reservoir tank, in between the sending unit housing and the tank. I removed the sending unit, cleaned the gasket and tank well, and replaced it. However it's still leaking from that spot. The oil is not coming out of the tank, rather it seems as if it back flosing from the line as the level in the tank isn't decreasing much. Also, there is a small priner bulb on this oil line that is as hard as a rock. Anyone know what is causing this?