The gy6 has no fuel pump. Strictly gravity feed. What you describe sounds like some sort of exhaust recirculating system for EPA emission standards. Pulls un burnt fuel/exhaust from exhaust then runs it back through carb through a vacuum activated valve. [your fuel pump thingy] You can get rid of it unless your concerned about the effect it may have on the ozone layer, global warming and stuff. It won't effect the performance of the motor. The hose from the valve cover is just a vent to relive excess crankcase pressure. Route it down low so that water can't get up the hose. Secure it so it doesn't flop around. With a uni there is only one vacuum hose needed. It runs from the vacuum source nipple on the intake to the slide diaphragm on the top of the carb. You will need to re-jet! if you don't ,you will run lean and eventually fry the motor. Stock jetting is some where around 114 on the main jet depending on some versions of a gy6. get a couple of jets in the 120's range. this will get it back to a good air/fuel ratio with a Uni filter.
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