The Detrimental Effects of Poor-Quality Fuel on Your Engine

Fuel has become a crucial element of mobility in a world increasingly reliant on vehicles. But how well do you understand what powers your car’s engine? Beyond just brands and prices, there are specific characteristics that determine fuel quality and have a direct impact on your vehicle’s performance and longevity. As a reliable auto shop, we’re here to break it down for you.

What Makes Good Fuel?

Putting aside the fact that engines operate on various fuel types, each with unique advantages and disadvantages, defining the quality of fuel requires examining its physical and chemical characteristics. These factors influence performance, efficiency, and the ability to keep an engine healthy and clean. So, what characteristics define good fuel for a vehicle?

Depending on the type of fuel, whether it’s diesel or gasoline, there are various considerations to take into account. In general, you should pay attention to the following:

• Viscosity
• Density
• API Gravity

However, the cetane number is what distinguishes regular from premium fuel, particularly in the case of diesel. The term cetane refers to the time between the fuel’s injection and the start of its combustion. A quick ignition followed by a total and uniform burn of the fuel results in quality combustion. Therefore, the higher the cetane number, the shorter the ignition delay and the higher the quality of combustion.

For gasoline, the octane rating indicates the fuel’s ability to resist premature detonation in high-compression engines. Fuels with a higher octane rating are ideal for high-performance engines. Ethanol content can increase octane and reduce emissions; however, high ethanol content can be detrimental to certain vehicles and engines.

For both types of fuel, a high sulfur content determines how environmentally friendly the fuel can be. The less sulfur the fuel contains, the fewer particulate emissions there will be. The sulfur in diesel engines, though, contributes to lubrication, so removing all of the sulfur from the fuel would result in improper engine operation.

Lastly, additives. Some fuels contain additives designed to improve engine efficiency, clean fuel injectors, and protect against corrosion and wear.

The Downside of Poor Quality Fuel

The most obvious signs of poor-quality fuel are the smell, which is often pungent and unpleasant, and the appearance, which is usually cloudy and murky compared to the clear and transparent look of normal fuel. Its viscosity is also a clue, as poor-quality fuel tends to be more viscous and sticky due to the presence of other oils. There are also chemical differences to consider:

• Excess sulfur, phosphorus, silicon, and heavy metals: These elements can corrode the internal parts of the engine and increase pollutant emissions.
• Aromatic alkenes, acids, and polycyclic aromatic hydrocarbons: These substances can form deposits in the engine, clog injectors, and reduce fuel efficiency.
• Prohibited substances: Some fuels may contain compounds like methylal and halogens, which can severely damage the engine.
• Water: The presence of water in fuel can cause corrosion, freezing in fuel lines, and starting problems.
• Other contaminants: Particles, sediments, and other contaminants can clog filters and affect engine performance.

Signs That Your Engine is Suffering From Poor Fuel Quality

The most noticeable effect of poor-quality fuel is that low-quality additives, combined with poor vehicle maintenance, cause the fuel filters to quickly fill with dirt and particles, eventually leading to clogging. This can result in various issues, including:

• Engine knocking: Poor-quality fuel can cause engine knocking, which can lead to serious engine damage.
• Deposits on valves and injectors: Contaminants in the fuel can lead to the accumulation of deposits on valves and injectors, affecting performance and efficiency.
• Increased fuel consumption: Poor fuel quality can increase fuel consumption and vehicle operating costs.
• Lack of acceleration response: The car not only has trouble starting, but it may also fail to respond properly when accelerating.
• Sudden engine shutdown: A clogged fuel filter can prevent fuel from reaching the engine adequately, causing it to shut off unexpectedly while in motion.

Immediate Effects and Car Damages Due to Poor Quality Fuel

You will notice immediately the reduced fuel efficiency and certain aspects of engine performance, such as lack of power and jerking while driving. The main precaution is to stay alert to the vehicle’s behavior, as any changes in driving will be noticeable right away.

Poor-quality gasoline primarily damages the car through its effects on the engine, including:

• Seals dry out, leading to breakage.
• Oxidation of engine parts.
• Moving parts are stuck.
• Clogging of the fuel filter.

Preventing Fuel-Related Engine Problems

• Fuel Up at Reliable Service Stations: Look for well-known service stations with a good reputation and inquire about their storage measures to ensure fuel quality. Also, check that the stations have adequate filters to prevent fuel contamination.
• Keep the Fuel Tank Clean: Avoid leaving the tank almost empty, as water and dirt deposits accumulate more easily in a nearly empty tank.
• Change the Fuel Filter Regularly: The fuel filter traps impurities and prevents them from reaching the engine.
• Use Fuel Additives (in moderation): Use cleaning additives to keep the fuel system clean, and stabilizers to protect the fuel from oxidation and extend its shelf life.
• Perform Preventive Maintenance: It’s essential to have your vehicle regularly serviced by a mechanic, especially if you have used or suspect the use of poor-quality fuel. Inspect the injection system, as dirty injectors can affect engine performance and increase fuel consumption. Also, clean the fuel tank if you suspect contamination.

If you suspect that poor-quality fuel has compromised your diesel engine’s performance, it’s time to take action. At ABCO Diesel in Orange, CA, our experienced diesel mechanic specializes in fuel system repairs and routine maintenance, ensuring your engine runs smoothly and efficiently. Don’t let subpar fuel damage your vehicle—visit our mechanic shop today for top-tier service that keeps your engine in peak condition. Contact us to schedule an appointment and learn more about how we can help maintain the longevity and performance of your diesel vehicle.