All the Cline pump does is regulate fuel pressure at the carb when the engine is running. Your problem is not too much fuel pressure, unless of course your tank is located way above the carb. I haven't had a whole lot of experience with inverted Moki's I just know that Moki or any other brand can be a problem inverted.

Are you hand proping or using an elec. starter??

I would try drying out the plug and connecting the glow driver without any priming at all.

Ron