5.9 Cummins Plugged Fuel Filter

Here are some circumstances that could lead to a 5.9L Cummins fuel filter being plugged.

Bacteria in the Fuel Tank

If your fuel tank has a grimy, carpet-like substance in the tank or fuel system degradation, it could be caused by bacteria. Diesel fuel can absorb moisture and cause bacteria growth in your fuel tank, clogging your filter with a slimy substance. To fix the issue, use a biocide to kill the bacteria. Once you’ve treated the bacteria issue, follow up with back-to-back treatments of Diesel Extreme to clean out the system. You should also replace the fuel filter to ensure the system is clear.

Dirty or Contaminated Fuel

Engine misfires, loss of power, excessive smoke and difficulty starting are clear signs of contaminated fuel. Dirty or contaminated fuel typically occurs when dirt, water or debris enter the fuel system and clog the filter. Draining and cleaning the fuel system is the first step in fixing the issue. You should also replace the fuel filter and only use clean fuel. 

Infrequent Fuel Filter Replacement

Failing to replace fuel filters can cause debris and contaminants to collect and clog the filter. This buildup can cause a gradual decrease in engine performance, rough idling or stalling when you accelerate. Make sure you regularly replace your fuel filter as part of routine maintenance according to manufacturer recommendations. 

Water Contamination in the Fuel

If your engine stalls, hesitates to start, stalls or idles roughly, especially during heavy acceleration, it could be due to water contamination in the fuel. Water sometimes enters the fuel system through condensation or faulty fuel storage conditions. This water may collect in the filter and lead to plugging. To fix the issue, use a powerful fuel system additive such as Diesel Extreme. Then, drain the fuel system and replace your fuel filter. Ensure proper diesel fuel storage and filtration in the future to avoid this issue.

Faulty Fuel System Components

Your fuel filter can become plugged due to faulty fuel system components. For example, a malfunctioning fuel pump or regulator can cause extreme pressure or improper fuel flow, clogging the fuel filter. You can identify possible faulty fuel system components through poor fuel flow, inconsistent engine performance or frequent stalling. To resolve this issue, test the fuel pressure, and if it’s outside the recommended range, replace the necessary components and fuel filter. 

There are several ways to diagnose whether your Cummins 5.9L fuel filter is plugged, including:

• Visual inspection: Examine your fuel filter and tank. If you find a dark, grimy substance, it indicates bacteria that you can treat with an additive that kills the growth.
• Fuel pressure test: If you discover low or unstable fuel pressure, check for a clogged fuel filter or restricted airflow using a fuel pressure gauge and replace the fuel filter if necessary. 
• Water contamination: Check your fuel filter or tank for signs of water in the fuel, such as a milky or cloudy appearance, and drain the system before replacing the filter.

Prevent plugged fuel filters on Cummins 5.9L engines and enhance performance with our premium diesel additives. 

Clear Up Clogged Fuel Systems With Hot Shot’s Secret Diesel Extreme

Hot Shot’s Secret’s Diesel Extreme is a powerful solution for maintaining the health of your diesel engine’s fuel system and preventing clogged fuel filters.

This high-performance additive goes beyond standard treatments by thoroughly cleaning injectors, removing stubborn carbon deposits including waxy and polymeric (IDIDs) deposits. After using a biocide to eliminate existing bacterial growth, use Diesel Extreme to clear out residual debris and restore fuel flow. Regular use can improve your engine’s performance and reduce the risk of future bacterial issues and fuel filter plugging. 

Choose Everyday Diesel Treatment to Enhance Your Cummins Engine’s Health

Fuel filter issues can severely impact the performance of a 5.9L Cummins engine, but Hot Shot’s Secret Everyday Diesel Treatment provides an effective way to prevent these problems. This advanced additive prevents filter plugging by removing water and contaminants that can accumulate in your fuel system. It also stabilizes asphaltenes, a key step in reducing blockages while improving cetane levels, lowering emissions and enhancing overall performance.

Add EDT with every fill-up to maintain a clean fuel system, ensuring your filter stays clear, and your engine performs at its best.