What is a 6.7 Powerstroke Contaminated Fuel System?

The 6.7L Powerstroke diesel engine is a workhorse, known for its power and reliability. But like any diesel engine, it’s susceptible to fuel system contamination. A contaminated fuel system can lead to a host of problems, from decreased performance to costly repairs. At Full Force Diesel, we see the effects of fuel contamination all too often, so we’re here to break down what it is, how to spot it, and what you can do about it.

What is Fuel System Contamination?

Fuel system contamination occurs when foreign substances enter the fuel system. These contaminants can range from water and dirt to rust, metal shavings, and even microbial growth. Think of it like this: your fuel system is designed to handle clean, filtered diesel fuel. Anything else is a potential problem.

Common Contaminants and Their Sources:

• Water: Water can enter the fuel system through condensation in the fuel tank, faulty fuel caps, or contaminated fuel sources. It can lead to rust, corrosion, and damage to fuel injectors and the high-pressure fuel pump.
• Dirt and Debris: Dirt, dust, and other debris can enter through a poorly sealed fuel filler cap, a damaged fuel filter, or even during fuel transfer. These particles can clog fuel filters and injectors, restricting fuel flow and impacting performance.
• Rust and Metal Shavings: Rust can form in the fuel tank or fuel lines, especially in older vehicles. Metal shavings can result from wear and tear on fuel system components, such as the fuel pump. These contaminants can cause abrasive wear and tear on critical fuel system parts.
• Microbial Growth: Also known as “diesel bug,” this refers to bacteria and fungi that can grow in fuel tanks, especially in warmer climates. They form a slimy substance that can clog filters and fuel lines.

Signs of a Contaminated Fuel System in Your 6.7 Powerstroke:

• Decreased Performance: You might notice a loss of power, reduced fuel economy, or sluggish acceleration.
• Rough Running or Misfires: Contaminants can disrupt the fuel delivery, leading to rough idling, misfires, or engine knocking.
• Hard Starting: A contaminated fuel system can make it difficult to start your engine, especially when it’s cold.
• Increased Smoke: You might see excessive black smoke coming from the exhaust, which can be a sign of incomplete combustion due to fuel delivery issues.
• Fuel Filter Clogging: If your fuel filter is constantly getting clogged, it’s a strong indicator of contamination.
• Check Engine Light: In some cases, a contaminated fuel system can trigger the check engine light.

What to Do if You Suspect Contamination:

If you’re experiencing any of these symptoms, it’s crucial to address the issue promptly. Ignoring it can lead to more serious and expensive problems down the road, including damage to the high-pressure fuel pump and injectors, which are costly to replace.

• Check Your Fuel Filter: Inspect your fuel filter for signs of contamination. A dark, dirty filter is a telltale sign.
• Drain Your Fuel Tank: Draining and cleaning the fuel tank can remove accumulated contaminants.
• Fuel System Flush: A professional fuel system flush can help remove deposits and contaminants from the entire system.
• Replace Fuel Filters: Regularly replacing your fuel filters is essential for preventing contamination.
• Use High-Quality Fuel: Choose a reputable fuel supplier and avoid filling up at stations with questionable fuel quality.

Prevention is Key:

Preventing fuel system contamination is always better than dealing with the aftermath. Here are some tips:

• Regular Fuel Filter Changes: Adhere to the recommended maintenance schedule for fuel filter changes.
• Use Fuel Additives: Consider using a high-quality fuel additive designed to prevent contamination and clean the fuel system.
• Inspect Fuel Cap: Ensure your fuel cap is properly sealed to prevent water and debris from entering the tank.
• Drain Water from Fuel Filter/Separator: If your truck has a water separator, drain it regularly.

Full Force Diesel Can Help!

At Full Force Diesel, we specialize in diesel performance and repair. If you suspect your 6.7 Powerstroke has a contaminated fuel system, don’t hesitate to contact us. We have the expertise and equipment to diagnose the problem and get your truck back on the road. We can perform fuel system flushes, replace fuel filters, and address any other fuel system issues. Contact us today to schedule an appointment!

See our fuel system Contamination Kits from Full Force Diesel.