The fuel system on your golf cart is one of the most vital equipment teams in helping the golf cart run. Unfortunately, there is all kinds of stuff within it and several things that can go awry. Things like carbs and lines can even have issues with the crankcase pressure that drives all of this. The most common failure is by far the Columbia and Harley Davidson Fuel Pump. These are diaphragm-driven pumps that help draw the fuel from the tank and get it to the carb. When you allow gas to sit in the lines, the diaphragm will start to go bad when the golf cart sits for long periods without use.This tiny hard part gets ruined by the ethanol that fuel companies use to boost octane levels. So first and foremost, if you can, only run octane-free gas in your golf cart and other small engines. Things will last longer and run better. Secondly, pick up the phone and get one of these aftermarket fuel pumps coming for your Harley.