Replace Check for leaks or damage to the fuel lines, and replace any worn or damaged parts immediately. Use high-quality fuel that meets the recommended specifications. If you have a biodiesel vehicle this is especially important (see makingbiodieselathome.org/biodiesel-filter.html ). Cooling System Maintenance
The cooling system is essential to keep the engine from overheating. Regular maintenance can help prevent damage to the engine and keep it running smoothly.