12Feb Why does diesel deteriorate?

A: When diesel fuel is stored it is easily contaminated. Even under the best conditions it should be cleaned or replaced after 6-12 months. Under less than perfect conditions, that may be considerably less. Here are some of the common contaminants:

• Water: Diesel is hygroscopic which means it absorbs water from the atmosphere and from condensation.
• Microbes and fungus: the combination of water and the carbon, oxygen, sulphur and trace elements in the diesel provide a perfect breeding ground for microbes and fungae which form a sludge in the diesel and on the sides of the tank.
• Rust: Water causes corrosion of the tank resulting in rust particles in the diesel.
• Particles: Dust, dirt and other particles build up and eventually block filters.