Replace your Golf's fuel filter every six months or 10,000 miles to protect its fuel system from dirt and rust. Fuel is pulled by engine vacuum through pin-sized holes inside the carburetor. If the fuel is dirty, it can clog the holes and change the fuel mixture. This can cause everything from a loss of power to serious engine problems. You can buy many fuel filters for the price of one rebuilt carburetor. Change your filter regularly to save money!