Rajan Wilcox
The micron rating of a diesel fuel filter is a critical factor in ensuring optimal engine performance and longevity. A micron, or one-millionth of a meter, is an extremely small unit of measurement that denotes the filter's ability to trap and capture contaminants. With most fuels containing some form of particulate matter, the micron rating assumes significance in preventing harmful substances from entering the engine, thereby reducing the risk of fuel pump failures, injector failures, and clogged fuel filters. The appropriate micron rating for diesel fuel filters is a subject of ongoing debate, with recommendations ranging from 2 to 30 microns, depending on various factors such as engine type, fuel quality, and operating conditions.
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What You'll Learn
The lower the micron rating, the smaller the particle it filters
Micron ratings are an essential part of industrial filtration systems. The micron rating of a fluid filter is a generalised way of indicating the ability of the filter media to trap particulates by the size of the particulates it is exposed to. A micron is equal to one-millionth of a meter or 1/25,000th of an inch. The naked eye can see objects as small as 40 microns.
Micron ratings can range from 1 micron up to over 800 microns. A lower micron rating means the filter can capture smaller particles and increase filtration efficiency. For example, a 10-micron fuel filter can theoretically capture particulates that are 10 microns or larger in size, which is about the consistency of talcum powder. Filters with a 10-micron rating can remove some unseen materials from liquid but not bacteria or viruses. A 25-micron filter can filter out anything larger than the size of a white blood cell.
The Fuels Institute's Diesel Fuel Quality Council (DFQC) has suggested that state dispenser filtration standards may not be stringent enough to sufficiently protect modern diesel engines. The DFQC report suggests that a 30-micron dispenser filter may not provide HPCR engines adequate protection from contaminated diesel. The report also states that high-volume fuel sites such as travel centres reported few complaints about fuel quality during research for the report, suggesting that fuel sites that do not quickly turn over their diesel supply are more susceptible to water contamination, microbial growth, and sediment.
When selecting the right micron rating for your industrial filtration system, there are a few factors to consider. The first factor to consider is the size of the particles that need to be captured. The media of the filter can also impact the effectiveness of the filtration system. Different media are designed to capture different particle types and sizes. For example, a filter with a pleated design can capture more particles than a flat filter with the same micron rating.
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100-micron filters are used as pre-filters
Micron ratings are a generalized way of indicating the ability of a filter to trap particulates. A 10-micron fuel filter, for example, can theoretically capture particulates that are 10 microns or larger in size. The smaller the micron rating, the better the filtering ability of the filter.
While a 2-micron filter can provide the greatest filtering and cleanest fuel, it can also be easily blocked. This is because water molecules are larger than 2 microns and will not pass through. This is beneficial because water can kill the injection pump and the injectors, but it is also detrimental as water in the fuel will cause a shutdown when the 2-micron filter doesn't pass it.
To avoid this issue, it is recommended to use progressively finer filters as the fuel approaches the engine. A 100-micron filter can be used as a pre-filter to trap the big stuff, followed by a 10-micron filter, and finally a 2-micron filter at the engine. This setup ensures that larger particulates are captured first, preventing them from reaching the finer filters and reducing the risk of blockages.
Some sources suggest using a 40-micron filter after the pump instead of a 10-micron filter. Additionally, it is important to note that dispenser manufacturers and state regulations may have specific micron requirements for diesel fuel filters. For example, the NIST Handbook 130 states that "all biodiesel, biodiesel blends, diesel, and kerosene dispensers shall have a 30 micron or smaller nominal pore-sized filter." Therefore, it is essential to refer to the specific requirements and recommendations for your vehicle and fuel system when selecting the appropriate micron rating for your diesel fuel filter.
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40-micron filters are for carbureted engines
Micron ratings are a generalized way of indicating the ability of a fluid filter's media to trap particulates based on their size. A micron, or micrometer, is equal to one-millionth of a meter or 1/25,000th of an inch. To put it into perspective, the diameter of a human hair is around 70 microns, while a red blood cell is 8 microns.
When it comes to diesel fuel filters, the specific micron rating to use depends on the type of engine and fuel system. For carbureted engines, a 40-micron filter is often recommended as a post-filter. Carbureted engines have more relaxed specifications since the jets in their carbs can pass much larger particles without issues. Therefore, a 40-micron filter is sufficient for trapping particles in a carbureted engine's fuel system.
It is important to note that a 40-micron filter may not be suitable for all applications. For fuel-injected engines, a finer filter, such as a 10-micron filter, is typically recommended to avoid plugging the injectors, which require very clean fuel. Additionally, the DFQC report suggests that a 30-micron dispenser filter may not provide adequate protection for modern HPCR engines from contaminated diesel, and a 10-micron filter may be necessary to capture damaging particulates.
When selecting a fuel filter, it is crucial to consider the specific requirements of the engine and fuel system. While a 40-micron filter is suitable for carbureted engines, it may not provide sufficient filtration for fuel-injected engines or modern HPCR engines. Therefore, it is always important to refer to the manufacturer's recommendations and industry standards, such as those outlined in the NIST Handbook 130, to ensure the appropriate micron rating is used for a particular application.
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10-micron filters are for fuel-injected engines
Micron ratings on filters typically range between 2 and 100, with a lower number indicating that the filter reliably removes smaller particles. A 10-micron fuel filter can theoretically capture particles that are 10 microns or larger in size. This is about the consistency of talcum powder.
A 10-micron filter is recommended for fuel dispensers to capture damaging particulate matter and prevent it from entering a vehicle's fuel tank, where it can damage the engine and other operating systems. The DFQC report “Diesel Storage Tanks: Industry Practices to Minimize Degradation and Improve Fuel Quality” suggests that a 30-micron dispenser filter may not provide HPCR engines with adequate protection from contaminated diesel. The report recommends 10-micron dispenser filters to capture damaging particulate matter.
The National Institute of Standards and Technology (NIST) Handbook 130, which publishes regulations about metrology and fuel quality, states that all diesel dispensers shall have a 30-micron or smaller nominal pore-sized filter. About half of the states in the US have adopted some version of the fuel dispenser filtration standards established by NIST.
For diesel engines, it is recommended to use progressively finer filters as the fuel approaches the engine. Using just a 2-micron filter can lead to issues, as water molecules are larger than 2 microns and will not pass through. This can be advantageous as water can damage the injection pump and injectors. However, it can also cause a shutdown when water in the fuel does not pass through the 2-micron filter. Therefore, for a three-filter system, it is recommended to use a 30 or 20-micron filter, followed by a 10-micron filter, and finally a 2-micron filter at the engine.
Aeromotive offers 10-micron fuel filters, and some diesel engines come with a 2-micron filter between the lift pump and the high-pressure pump, followed by a 10-micron secondary filter.
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2-micron filters can block fuel flow
A micron, or micrometer, is a unit of measurement equal to one-millionth of a meter or 1/25,000th of an inch. Filters are placed on fuel dispensers to trap potentially harmful particulates before they can enter a vehicle's fuel tank and damage the engine and other operating systems.
The micron rating of a fluid filter is a generalized way of indicating the ability of the filter media to trap particulates by the size of the particulates it is exposed to. A 10-micron fuel filter, for example, can theoretically capture particulates that are 10 microns or larger in size.
While a 2-micron filter can provide the greatest filtering and cleanest fuel, it can also block fuel flow more easily. Water molecules are larger than 2 microns and will not pass through a 2-micron filter. This can be good because water can kill the injection pump and injectors, but it can also cause a shutdown when the 2-micron filter doesn't pass the water.
To avoid this issue, it is recommended to use progressively finer filters as the fuel approaches the engine. For instance, a 10- or 20-micron filter can be used first, followed by a 2-micron filter at the engine. If using three filters, a setup of 30 or 20, then 10, then 2 is suggested.
It is important to note that the term 'micron' is considered obsolete, with 'micrometer' being the correct term. Additionally, the size and placement of the filter are crucial to ensure proper fuel flow, as a filter that is too small can reduce pump output and cause the pump to run hot.
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Frequently asked questions
A micron, or micrometer, is a unit of measurement equal to one-millionth of a meter or 1/25,000th of an inch. The human eye cannot see objects at this scale.
A micron rating is a generalized way of indicating a filter's ability to trap particulates based on their size. The lower the micron rating, the smaller the particle it will filter out.
The appropriate micron rating depends on the specific application. Engine manufacturers recommend using a 2 to 10 micron filter for ULSD (Ultra Low Sulfur Diesel) fuels. However, some sources suggest using a 10 or 30 micron primary filter element to prevent damage to the engine fuel lift pump and injector pump.
The NIST Handbook 130 specifies that diesel dispensers should have a 30 micron or smaller nominal pore-sized filter. For gasoline and its blends, a 10-micron or smaller filter is required. The DFQC report suggests that a 10-micron dispenser filter may be necessary to capture damaging particulate matter adequately.
