The crankcase on your golf cart runs the fuel system. Without the pressure created there, minute as it may be, there would be no way for the gas to get from the tank to the engine. The fuel pump on your golf cart is a diaphragm-operated system. It uses the fluctuating pressure of only one to three pounds to draw the fuel and pump it up towards the carburetor. If parts like the Club Car Crankshaft Seal for the Fan-Side fail or blows out, the pressure will drop to nothing, and the pump does not work. Now at full throttle, the carb creates enough suction to bypass everything before it. So if you are having more issues at slow speeds, this may be the issue plaguing your caddie.This golf cart seal is not a 10-minute job. If you need to replace this part, chances are you will need a few other things too. Buggies Unlimited carries entire rebuild kits at a low cost. These will come with everything you need and not break the bank in the process. Give us a call today.