When you are installing a fuel and vacuum line on a gy6 carburetor, it is important to make sure that the connections are correct. This is because the lines need to be in line with the engine. In order to make the connection, you will need to remove the air filter. This can be done by loosening the screws at either side of the filter cover. Once it has been removed, you will need to loosen the clamp that holds it in place. Next, you will need to disconnect the fuel hose from the pump. Next, connect the vacuum hose to the pump and then reconnect the fuel hose. Finally, reattach the air filter and tighten all of the screws.