You can check your float to make sure it is closing the inlet valve where the fuel line comes in. You can check the needles and make sure they are straight. Make sure the Electric connection is secure at the back that controls the Fuel/Air mixture. in the bottom between the barrel you should see a rod moving back and forth. Make sure the tops of the venturis are tight (it should look like the top of a flat head screw with a hole in the middle.) Hopefully that top isn't missing on either of them, or it is probably in your manifold or engine somewhere.