Make sure you don't have a vacuum leak. Under the intake is a plastic isolator, some use a o-ring on one side and gasket on other, some are gasket on both sides. The o-ring could be cracked or the isolator could be cracked causing a vacuum leak. The reason for the vacuum pump is for safety. Atv's come with petcocks, if rolled there is nothing keeping you on the vehicle. The buggy if rolled will build pressure in tank as it rolls and the check ball in cap will close off the vent causing fuel to still feed the carb in a roll over possibly causing gas to ignite on hot engine with occupant belted in. Not a good scenario.
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