Why Does the Fuel in a Diesel Vehicle's Tank Turn Black?
2 Answers
Diesel fuel may turn black due to prolonged storage. Here are some precautions for diesel storage and usage: 1. Prohibited uses: It is strictly forbidden to mix diesel with gasoline for lighting or as fuel for kerosene stoves. 2. Before use: Diesel must be settled, filtered, and freed from impurities and water before use to ensure the proper functioning of the diesel engine's fuel supply system. In winter, diesel can be preheated if necessary. 3. Mixing: Different grades of diesel with the same classification have similar quality indicators except for the freezing point and cold filter plugging point. Therefore, when resources are insufficient, they can be mixed under suitable temperature conditions.
I noticed the diesel fuel in the tank turning black, and there are several common reasons for this. Microbial growth is the primary cause, especially in humid environments where bacteria and fungi thrive in the diesel, forming sludge that darkens the fuel. Water ingress is another frequent issue, such as condensation or rainwater seeping into the tank, leading to metal corrosion and the mixing of impurities into the fuel. Additionally, long-term storage can cause fuel oxidation and degradation, resulting in dark-colored sediment. I recommend regularly checking the tank's condition, using diesel biocides, and ensuring the fuel cap is tightly sealed to effectively prevent this issue. If the fuel turns severely black, promptly visit a repair shop to clean the entire fuel system, preventing clogged injectors and engine performance issues. This is crucial for the vehicle's lifespan—don't let it escalate into a bigger problem.
