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Sure does sound like a fuel issue… What kind of fuel line and primer bulb are you using? If it’s an aftermarket line, the inner barrier in the hose will come apart and restrict fuel flow. Pull the fuel line connectors off each end and have a look inside. You can usually see it when you look inside the fuel line. If aftermarket, I would replace it now, cause it will eventually come apart anyway. The aftermarket fuel line quick connectors don’t seal right either…. and can suck air (vaccume leak) while underway… another possible cause of surging. You mentioned that squeezing the primer bulb made no difference? A plugged fuel supply line cannot be overcame by squeezing the bulb.