Sylvie Willis
The micron rating of a fuel filter is an important consideration when selecting a fuel filter for E85. A micron is a unit of measurement equal to .000039 inches, with a human hair measuring about 100 microns in diameter. Fuel filters with lower micron ratings can filter out smaller contaminants. For E85 fuel, some sources recommend a fuel filter with a micron rating of 10 or lower, while others suggest a rating of 12 or a range of 30-40 microns. It is important to note that smaller fuel filters may not be as effective and can become clogged more easily. Additionally, the compatibility of the filter with the fuel pump and the material of the filter, such as stainless steel or paper, are also factors to consider when choosing a fuel filter for E85.
Characteristics and values of E85 fuel filters
| Characteristics | Values |
|---|---|
| Filter material | Stainless steel, synthetic media, fiberglass, paper |
| Micron rating | 10, 25, 35, 40, 45, 100 |
| Brand | Aeromotive, MagnaFuel, K&N, Professional Products, Fuel Lab, Golan, PQYRACING, Injector Dynamics |
| Compatibility | E85, ethanol |
| Features | Pre-filter design, interchangeable internal filter, male AN / 37º Flared fitting end caps, internal radii for pressure reduction, adapter brackets, clamp |
| Performance | Effective at blocking contaminants, preventing pump cavitation, and maintaining engine cleanliness |
| Customer feedback | Good build quality, affordable, effective, easy to install, good value for money |
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What You'll Learn
10-micron filters are incompatible with ethanol
E85 fuel requires a fuel filter with a micron rating of less than 10. While some sources suggest that a 10-micron filter can work with E85, others advise against it, as it may not be compatible with ethanol content above 10%.
Micron ratings on filters typically range between 2 and 100. A lower micron rating indicates that the filter can reliably filter out smaller particles. While a smaller micron rating can provide better filtration, it also increases the risk of the filter becoming clogged. Therefore, it is important to choose a filter with the right micron rating for your specific application.
In the context of E85 fuel, a 10-micron filter may not provide sufficient filtration to protect fuel injectors, carburetors, and electric fuel pumps from harm caused by small particles. Over time, these small particles can build up and clog the injectors, leading to reduced performance and potential damage to the fuel system.
To ensure compatibility and optimal performance with E85 fuel, it is generally recommended to use a fuel filter with a micron rating of 8 or lower. Filters made from stainless steel or fiberglass material are often preferred for their durability and effectiveness in filtering out fine particulates. It is also important to consider the filter material and the presence of a pre-filter or "sock filter" to extend the life of the main fuel filter and provide additional protection for the fuel system.
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10-micron Aeromotive microglass filters
The Aeromotive 10-micron microglass filters are designed to offer unmatched flow, ease of installation and maintenance, and impeccable machining and finish. The filters are made from 6061-T6 aircraft-grade aluminium and feature a black anodized finish. They are engineered for fuel system performance and are suitable for 200-3000+ HP applications.
The 10-micron microglass replaceable element provides high flow with a pressure drop of less than 1 PSI, flowing 2000 lb/hr. The filter assemblies feature an O-ring for positive sealing in high-pressure applications. The in-line filters have a large surface area, thanks to their pleated design, which allows for better flow.
While some sources suggest that these filters are compatible with E85 fuel, there is conflicting information in the fine print, indicating that they are not recommended for over 10% ethanol content. It is important to carefully review the product specifications and guidelines provided by the manufacturer before use.
The Aeromotive 10-micron microglass filters are not legal for sale or use on emission-controlled vehicles, except when used as a direct replacement part matching OEM specifications. However, they are 50-state legal when installed on specified vehicles per the manufacturer's current application guide, CARB EO, and installation instructions.
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Injector Dynamics recommends a 10-micron filter before injectors
A 10-micron filter will ensure that only particles smaller than 10 microns pass through. This is important because even tiny particles that cannot be seen with the naked eye can cause significant damage to fuel injectors.
Bosch, for example, recommends a 5-micron filter and warns that particles larger than 35 microns can cause injector damage. Injector Dynamics' own ID F750 filter meets Bosch's specification of a minimum capture efficiency of 87% at 5 microns and 100% capture efficiency at 35 microns.
While some sources suggest that a higher micron rating may be sufficient, with some filters rated as high as 100 microns, Injector Dynamics emphasizes the importance of effective filtration. They advise against small fuel filters, especially those with a single round screen disk, as they can easily become clogged and restrict the fuel system.
Therefore, to maintain optimal injector performance and longevity, Injector Dynamics recommends the use of a 10-micron filter before the injectors.
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100-micron pre-filter design
A 100-micron pre-filter is considered too large by some users, who suggest that a smaller micron rating is better for filtering out fine particles in the fuel. However, others have used a 100-micron pre-filter with no issues reported.
For a 100-micron pre-filter design, it is important to consider the filter material. Some users recommend using a stainless steel mesh or a stainless steel element for the pre-filter. This is because stainless steel is durable and can handle the ethanol content of E85 fuel.
One design consideration is the use of a filter sock in conjunction with the 100-micron pre-filter. This can help ensure that larger particles are caught by the sock, while the pre-filter focuses on the finer particles.
Another design aspect to consider is the shape and size of the pre-filter. It should be designed to fit the specific fuel system and housing that it is being used with. For example, some users have mentioned using a -8 AN inline filter with their pre-filter.
In terms of specific products, some users have recommended the MagnaFuel MP-7008 from Summit, which is a 25-micron stainless steel filter. Others have suggested using a 10-micron Aeromotive microglass filter, although it is important to note that these filters are not recommended for ethanol content above 10%.
Overall, when designing a 100-micron pre-filter for E85 fuel, it is important to consider the filter material, the use of a filter sock, the shape and size of the filter, and the specific products that are compatible with E85 fuel.
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12-micron microglass ethanol-compatible fuel filters
For E85 fuel, a 10-micron filter is generally recommended. Some sources suggest that a 10-micron filter is sufficient for filtering out fine particulates that can clog injectors, while others recommend going as low as 8 or even 5 microns.
Aeromotive offers a 10-micron microglass filter that is compatible with E85 fuel. This filter is designed for use on the pressure side of a fuel pump and is suitable for a variety of fuel types, including gasoline, diesel, ethanol, and methanol. It fits all 2-1/2" OD x 7" long ORB-12 filter housings and is recommended for applications burning pump gas, racing gas, diesel fuel, jet fuel, and av-gas.
The Aeromotive 10-micron microglass filter is a high-flow option that provides maximum flow filtration for brushless gear and mechanical fuel pumps. It is ideal for broad fuel applications, including alcohol methanol, ethanol, gasoline, and diesel fuel using mechanical or electric fuel pumps up to 32-GPM. The extreme-flow version of this filter features a tough, Hard-Coat Black finish and is also available with AN-16 ORB ports, making it suitable for fuel pumps of all types.
While the Aeromotive 10-micron microglass filter is a popular choice for E85 fuel systems, there are other options available on the market as well. For example, Fuel Lab offers a 10-micron filter that is E85-safe, and Fore Innovations and Golan also offer 10-micron filters that are compatible with E85 fuel. Additionally, some users have reported success with paper filters, despite conventional wisdom suggesting otherwise.
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Frequently asked questions
A micron is a unit of measurement, equivalent to ..000039 inches. A human hair is about 100 microns in diameter.
Most sources recommend a 10-micron filter for E85 fuel. Some sources say that anything above 10 microns will cause issues with the injectors.
Yes, there are several options available on the market, including the Fore Innovations 10-micron filter, the Fuel Lab 8-micron fiberglass filter, and the MagnaFuel MP-7008 10-micron stainless filter.
Yes, PQY Racing offers an inline fuel filter with a 100-micron stainless steel element that is compatible with E85.
Yes, some sources mention using a 10-micron paper filter or a 12-micron microglass ethanol-compatible filter. However, it is recommended to stay away from small fuel filters as they can get clogged easily.
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