There is a vent on the bottom of the crankcase. I tried to find a rear cover for the engine but the manual says there is a pressure nipple on the cover? Is there one or is that for a different engine.

I was hoping to use the pump but if it's bad then I guess not. It is leaking from the end of the blue case. Was hoping that maybe the allen screw needed to be tightened or something simple but guess not.