Regan Brown
Water in diesel fuel can cause a variety of issues, including damage to the injection system, corrosion of the tank and fuel system, and abrasive wear to parts. To prevent these issues, it is important to drain the water from the diesel fuel water separator regularly. The frequency of draining depends on various factors, including the climate and the source of diesel fuel. Some people choose to drain their water separators monthly, while others do it every six months or only when necessary, such as when a water symbol on the dash appears. The process of draining the water involves releasing the vent valve at the top of the filter housing or loosening the uppermost fuel pipe. It is important to collect the drained fuel and water mixture in a container and properly dispose of it, such as by taking it to a recycling center.
| Characteristics | Values |
|---|---|
| How often to drain | Every month or every 6 months, depending on the climate and where fuel is purchased from |
| How to check if draining is required | Check for a water symbol on the dash, or crawl under the truck to check the canister |
| How to drain | Release the vent valve at the top of the filter housing, or loosen the uppermost fuel pipe from the filter housing. Hold a jar under the drain plug and loosen the plug. Let the filter drain until clean diesel fuel flows out, then close the plug and the vent valve. |
| What to do with drained diesel | Take it to a recycling center, or use it to start bonfires |
| How to avoid water in the fuel | Keep the tank full of fuel so there is less chance of moisture condensing |
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What You'll Learn
Water in diesel fuel can cause engine damage
Water in diesel fuel can cause serious engine problems and damage. While some water in diesel fuel is inevitable, it is important to keep water levels within acceptable limits and well below the saturation point. Water can enter the fuel during transit, storage, or handling, and it can cause a range of issues, from engine performance problems to corrosion and clogging.
One of the main issues with water in diesel fuel is that it can freeze, especially during winter. Frozen water in the fuel line, fuel pump, or fuel filter can lead to engine issues and even damage. As the temperature drops, the water in the diesel fuel can turn into ice crystals, which can clog fuel filters and create wear in fuel systems. This can result in erratic idling, momentary engine cut-out, and reduced engine performance.
Another consequence of water in diesel fuel is the growth of microbes, such as bacteria and fungi. Water provides the necessary environment for microbes to establish themselves and multiply. These microbes produce acids that degrade fuel quality and corrode tanks, as well as biomass that clogs filters and accelerates corrosion.
Water can also cause surface fatigue and erosion in metal surfaces. This is due to a process called spalling, where water is forced into microscopic cracks in the metal and, under extreme pressure, decomposes and releases hydrogen in a mini-explosion. This enlarges the cracks and creates wear particles, leading to engine damage.
To prevent water-related engine damage, it is essential to regularly monitor and control water levels in diesel fuel. This can be done through proper water management strategies, such as using water-dispersing formulations, water coalescing filters, or chemical control options. Additionally, ensuring that water does not enter the tank in the first place is crucial. By understanding the potential sources of water ingress, such as condensation, leakage, or ground water, and taking preventive measures, the risk of water-related engine damage can be significantly reduced.
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Water contamination can occur through condensation
Diesel fuel has hygroscopic qualities, meaning it attracts and absorbs moisture from the air. This inherent property contributes to the presence of water in diesel fuel. However, condensation can further exacerbate the issue by increasing the water content. Modern diesel fuel systems are less tolerant of water, emphasizing the importance of keeping water levels within acceptable limits.
One way to address water contamination through condensation is to use a water separator or filtration system. These systems, such as the AirDog® FPII system, effectively separate air and water from the fuel before it reaches the engine. Regular maintenance of these systems is essential to ensure optimal performance and minimize water levels.
Additionally, human error can play a significant role in water contamination. Leaving the fuel tank cap off or having poor tank seals can invite water contamination, including condensation. Emphasizing proper fueling procedures and maintenance is critical for fleets and independent truckers to prevent water-related issues.
Water in diesel fuel can lead to microbial growth, fuel degradation, and engine performance problems. Therefore, it is essential to monitor water levels regularly and take preventive measures to keep water content within acceptable limits. Condensation is just one aspect of water contamination, and a comprehensive water management strategy should be implemented to protect diesel fuel systems and engines.
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Microbial growth in water can damage fuel and tanks
The microbial growth and biomass production result in what appears to be a dark slime with an appearance of algae – some have even likened it to chocolate mousse. This slime or sludge can contaminate fuel, which could lead to problems in vehicles that use the fuel. It can also degrade tank components, clog fuel lines and filters, and cause incorrect gauge readings.
To prevent microbial growth, limit the amount of water in the storage tank. Check tank bottoms for water every month initially, decreasing the frequency if no water is found. Tanks should be checked for water at least twice a year. Regularly drain water from the bottom of the fuel tank by mechanical methods or with drain plugs located at the bottom of the tank. Water leakage into underground storage tanks should also be prevented.
If you suspect microbial growth in your diesel fuel storage tanks, talk to your local Co-op Fuel Team to find out how to submit fuel samples for testing and learn about remediation options. Fuel filtration and polishing include methods that remove water and contaminants from the fuel without removing the fuel from the tank. Some vendors use fibre-optic technology or remote video cameras to visually locate and observe the contaminant removal progress.
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Drain diesel fuel water separators every 6 months
It is recommended that you drain diesel fuel water separators every six months to ensure the optimal performance of your vehicle and prevent potential issues. While the frequency of draining may vary depending on regional and climatic factors, adhering to this schedule can help maintain the integrity of your engine.
Diesel fuel is particularly susceptible to water contamination, which can occur through condensation, human error, ingress during refuelling, or water leakage into the tank. Water in the fuel system can lead to several problems, including microbial growth, corrosion, and rust formation. By regularly draining the water separator, you can mitigate these issues and maintain the cleanliness of your fuel.
The process of draining a diesel fuel water separator is straightforward. Begin by stopping your vehicle and shutting off the engine. Locate the diesel fuel conditioner module or the water separator/filter, which is usually mounted on the inside frame rail on the driver's side. Place an appropriate container, such as a jar or bowl, under the drain plug or tap. Release the vent valve positioned at the top of the filter housing or loosen the uppermost fuel pipe if there is no valve. Allow the separator to drain until you observe clean diesel fuel flowing out, then close the plug or tap and tighten the vent valve.
It is important to note that you should not remove the filter when draining the water separator, as this can create suction and pull more fuel out of the tank. Additionally, always ensure that you fully tighten the drain valve to prevent air from entering the fuel system and causing drivetrain issues.
By following these steps and maintaining a regular draining schedule, you can help ensure the longevity and efficient operation of your diesel engine. Remember to consult your vehicle's manual or seek guidance from a qualified mechanic if you have any questions or concerns about the draining process or the specific intervals recommended for your vehicle.
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Properly dispose of drained diesel fuel
Diesel fuel is highly volatile, flammable, explosive, toxic, and an air pollutant. Therefore, it must be handled and disposed of with care.
If you have a small amount of diesel fuel to dispose of, you can burn it in a fire pit, although this is not the safest option. Diesel fuel is safer to burn than gasoline as it is less flammable. However, you should never mix gasoline with waste oil or other automotive products, and never use it as a cleaning solvent. When handling gasoline, wear nitrile gloves, and thoroughly wash your hands when finished and before eating.
For larger amounts, it is recommended to take the diesel fuel to a hazardous waste drop-off point for recycling. Most decent-sized cities have these facilities, and some are free to use. If you are unsure, you can call ahead to check if they accept diesel fuel and if there are any associated costs.
Another option is to contact local automotive shops and ask if they have a waste oil burner for heating. Some shops may be interested in taking your diesel fuel for this purpose.
It is important to note that it is illegal to transport fuel in a car boot over a certain amount, so be sure to check the regulations in your area.
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Frequently asked questions
It is recommended that you drain your water separator every month. However, this depends on the climate you live in and where you buy your fuel. If you live in a humid climate, or buy your fuel from a local convenience store, draining your water separator more frequently, such as every month, is advised.
Check your vehicle's dashboard for a water symbol. If this lights up, it is time to drain the water from your diesel fuel water separator.
Water in your fuel system can cause a variety of issues. Water can encourage microbial growth, which can create slimes that dirty your fuel and acids that corrode your tank and fuel system. Water can also cause rust, which can lead to abrasive wear and part failure. Furthermore, water in your fuel system can damage the injection system, preventing the engine from starting.
You should not dispose of diesel in the ocean or on the ground. Take the drained diesel to a recycling center or use it to start bonfires.
