The best E85 conversion choice depends on whether you need a vehicle-specific flex-fuel system, a sensor for custom tuning, carburetor metering parts, or ethanol-compatible fuel lines. The ZZPerformance kit is intended for certain ATS/CTS applications and requires its PCM tune; the Universal Flex Fuel Kit supports a flex-sensor signal; and PTFE hose kits can serve fuel-system builds when their specifications suit the installation. Verify vehicle fitment, tuning requirements, and fuel compatibility before buying.
| Product | Best suited for | Key detail |
|---|---|---|
| ZZPerformance ATS/CTS Kit | Specified ATS/CTS owners | Requires ZZPerformance PCM tune |
| Universal Flex Fuel Kit | Custom flex-fuel tuning setups | Converts sensor frequency to 0–5V |
| Quick Fuel Metering Block Kit | Carburetor conversion projects | Adjustable idle feed restrictions |
| EVIL ENERGY 25-Foot PTFE Kit | Longer EFI or LS fuel-line routes | PTFE hose; 25-foot length |
| EVIL ENERGY 10-Foot PTFE Kit | Shorter fuel-line runs | PTFE hose; 10-foot length |
ZZPerformance ATS/CTS Flex Fuel Kit
This is the most vehicle-specific option in this selection. ZZPerformance says the kit monitors ethanol percentage and allows operation with varying mixes of E86 and premium gasoline. Its stated application is ATS/CTS, so confirm that your exact vehicle and setup are supported before ordering.
- Best for: ATS/CTS owners seeking ethanol-percentage monitoring and flex-fuel operation.
- Why it was selected: It is the only listed kit specifically identified for a vehicle family and flex-fuel use.
- Important limitation: The product requires a ZZPerformance PCM tune. Do not assume it works as a standalone hardware installation.
Universal Flex Fuel Kit
This kit is designed to provide a flex-fuel sensor signal for a tuning setup. It converts frequency from the included GM flex fuel sensor to a 0–5V output and includes a sensor with 3/8-inch fittings. That signal-conversion function may suit a custom project, but the supplied details do not identify supported vehicles, tuning software, or installation requirements.
- Best for: Builders whose controller or tuning arrangement can use the stated 0–5V output.
- Why it was selected: It includes a sensor and a defined signal-conversion function rather than only fuel-line hardware.
- Important limitation: Confirm electrical and tuning compatibility with your system; “universal” does not establish fitment for every vehicle.
Quick Fuel E-85 Metering Block Kit
This is a carburetor-oriented conversion component, not an electronic flex-fuel sensor kit. Its listed feature is adjustable idle feed restrictions measuring 0.043 inches. That makes it relevant to buyers working with a compatible carburetor and metering-block setup who need an adjustable idle-feed component.
- Best for: Carburetor users researching E-85 metering changes.
- Why it was selected: It is the list’s clearest option for a carbureted fuel-system conversion.
- Important limitation: The provided product details do not specify carburetor fitment or the full parts included. Verify both before purchase.
EVIL ENERGY 25-Foot PTFE Fuel Line Kit
This 6AN kit includes 25 feet of PTFE nylon-braided fuel hose and components shown in the product image. The listed hose dimensions are 5/16-inch inside diameter and 0.45-inch outside diameter. The stated temperature range is -76°F to 446°F, with a maximum working pressure of 1,500 PSI. It is described for EFI and LS applications, among other uses.
- Best for: Installations needing a longer PTFE line and a stated high-temperature operating range.
- Why it was selected: PTFE construction and the listed specifications make it more relevant to an E85-oriented fuel-line build than a hose explicitly excluding ethanol.
- Important limitation: Measure the route and verify fittings, fuel compatibility, and system requirements before installation.
EVIL ENERGY 10-Foot PTFE Fuel Line Kit
This shorter 6AN PTFE kit is an alternative when a project needs less hose than the 25-foot option. Its listed dimensions are 5/16-inch inside diameter and 0.45-inch outside diameter, and its operating range is -76°F to 446°F. The product description says it is suitable for automotive fuels, lubricants, and coolants.
- Best for: Builds with a shorter measured fuel-line route.
- Why it was selected: It offers the same stated hose dimensions and temperature range as a compact-length option.
- Important limitation: At 10 feet, it may not provide enough hose for a longer route. Confirm the included components and required fittings.
Buying Guide: Choosing E85 Conversion Parts
Do you need a complete flex-fuel system or just a component?
A conversion may involve more than a hose or sensor. A vehicle-specific kit, sensor signal, engine calibration, fuel lines, and other system requirements are different needs. Match the product to the part of the project you are addressing. The ZZPerformance kit explicitly requires its PCM tune, while the Universal Flex Fuel Kit specifies a sensor signal conversion but does not list supported tuning systems.
How should you check fuel-line compatibility?
Read the stated fuel compatibility carefully. The EVIL ENERGY PTFE kits listed here describe suitability for automotive fuels, but buyers should confirm the exact product’s materials and intended use with the seller or manufacturer before using E85. Do not confuse them with the EVIL ENERGY CPE kit in the product list: its description explicitly excludes E85 and ethanol.
How do you choose hose length and fittings?
Measure the planned route before selecting a 10-foot or 25-foot hose. Compare the 6AN connection type, inside and outside diameters, and included adapters with your installation. Pressure and temperature figures describe product specifications; they do not by themselves establish that a kit is appropriate for every vehicle or fuel system.
Is a carburetor kit interchangeable with a flex-fuel kit?
No. A metering-block conversion component serves a different function from an electronic flex-fuel sensor or a fuel-line kit. Confirm the carburetor application and tuning approach before choosing carburetor parts. For any conversion, consult a qualified technician if fitment, calibration, or fuel-system safety is uncertain.
Frequently Asked Questions
Does an E85 fuel line convert a vehicle to flex fuel?
No. A fuel line is a plumbing component. Flex-fuel operation may require compatible sensing, tuning, and other vehicle-specific changes.
Does the ZZPerformance kit include tuning?
The supplied product details say it requires a ZZPerformance PCM tune. Confirm what is included and whether your vehicle is supported before purchase.
Can I use the listed CPE fuel-line kit with E85?
No. Its product description explicitly says it is not compatible with E85 and ethanol.
What is the difference between the two EVIL ENERGY PTFE kits?
The listed length is the main stated difference: one kit is 25 feet and the other is 10 feet. Measure your route and verify the kit contents before choosing.