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Wierd fuel system on BBB 107cc??

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Just picked this up cheap today, it has spark and wants to run for a second after about 50 kicks. Its not getting much fuel if any. I tried another carb on it but it does the same thing. Wondering what the rest of this fuel system is all about? Theres a tube coming off the carb neck going up into the assembly above the carb neck, which looks like a fuel pump or something like on a snowmobile? Then there is at tube going from the assembly to the bottom of the engine, and a vent tube that goes back under the bike. I have had a couple pitbikes in the past and friends have them, never seen a fuel setup like this before? I'm thinking something is wrong with this secondary system because it won't start with too different carbs.

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Gas is getting to the carb no problem, but not to the engine. Thats why I am thinking it has something to do with this vacuum system? Not drawing the mixture from the carb into the engine?

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I am going to start playing with removing and blocking some hoses on it. I believe it had a vacuum operated petcock which the previous owner removed and added a manual petcock, so I think that has something to do with it

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