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Suzuki RV 90 Petcock Valve / Fuel Pump

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So I have this Suzuki RV 90 that was given to me and finally got it running. It has this funky fuel pump on it that is controlled by vaccum from the carb manifold. I was wondering if you could just replace this setup with a normal petcock valve and get rid of the fuel pump. Seems to me the system is gravity fed and should work fine without the pump. Any thoughts out there? Do you think the needle valve will control the fuel flow without the pump or will the carb just flood out under constant gravity feed?

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