Fuel System Kits

Q: What are symptoms of a fuel system issue?

Common symptoms of an underlying Fuel System problem include: Engine Misfires or Rough Idling: Inconsistent fuel delivery to one or more cylinders. Poor Acceleration or Hesitation: Often caused by a clogged fuel filter or a weak Fuel System pump that cannot maintain pressure under load. Engine Cranks but Won't Start: A lack of fuel reaching the combustion chamber. Decreased Fuel Economy: Leaks or improperly functioning injectors (common in older EFI System components). Check Engine Light (CEL): Often triggered by lean or rich conditions due to incorrect fuel metering.

Q: What does it mean to do a LS swap?

An LS Swap refers to the highly popular modification where a mechanic or enthusiast replaces the original engine in a vehicle (often a classic car, truck, or import) with a modern General Motors (GM) LS-series V8 engine. The LS engine is celebrated for its lightweight design, compact size, reliability, and immense horsepower potential straight out of the box, making it the definitive choice for performance conversions.

Q: What is an EFI system in cars?

EFI stands for Electronic Fuel Injection . The EFI System is a modern Fuel System technology that uses an Electronic Control Unit (ECU) and sensors to precisely determine the required amount of fuel. The ECU signals the injectors to spray the exact amount of fuel directly into the engine, replacing older, less efficient carburetor technology. Our EVIL ENERGY fuel systems often include components designed specifically to support these high-pressure EFI Systems . Key Advantages of an EFI System: Improved Fuel Economy: Due to precise fuel metering. Enhanced Performance: Optimized air-fuel ratios lead to consistent power delivery. Reliable Cold Starts: The system automatically adjusts for varying temperatures. Lower Emissions: More complete combustion reduces pollutants.

Q: What is needed to do a LS swap?

Performing an LS Swap is complex and requires several specialized components beyond the engine itself. Key components needed include: The LS Swap Fuel System (Crucial for providing the high-pressure required by the LS engine's EFI System ). Engine Mounts and Transmission Adapter Plate. Wiring Harness (Often a custom or standalone harness). Cooling System Upgrades (Radiator, Hoses). Custom headers and exhaust.

Q: Is fuel system cleaner good or bad?

Generally, a high-quality Fuel System cleaner is good when used as directed. It helps dissolve varnish and carbon deposits that build up over time in the fuel lines, pump, and injectors. However, excessive or repeated use of aggressive cleaners is unnecessary and can potentially damage sensitive components in older engines or certain EFI fuel systems .

The EVIL ENERGY fuel system collection provides essential, high-flow solutions for performance automotive modification. Key product offerings in this robust Fuel System lineup include specialized kits for swaps like the LS Swap Fuel System, precise components for modern EFI fuel systems, and a complete Fuel Line Kit. Choosing evil energy auto parts ensures reliable, consistent, high-pressure fuel delivery, critical for maximizing any EFI System or high-horsepower engine's potential with reliable evil energy fuel systems.

EVIL ENERGY Fuel Systems—Unleash Engine Potential

Performance Foundation: The Quality of EVIL ENERGY Fuel Systems

For vehicle owners who demand extreme performance and reliability, an efficient Fuel System is the critical foundation for stable high-horsepower output. Our evil energy fuel system product is engineered to replace restrictive OEM lines and components, eliminating fuel supply bottlenecks within the Fuel System. Whether you are preparing for the track, drag racing, or building a high-horsepower street car, evil energy auto parts ensure stable pressure, ample flow, and superior corrosion resistance throughout the entire fuel system.

Solutions for Modern Swaps: LS Swap and EFI Systems

We recognize the complexity of modern engine modifications. For popular engine conversion projects, especially the LS Swap Fuel System, we offer comprehensive, ready-to-install solutions. These kits integrate all necessary components, significantly simplifying the routing and installation process of the Fuel System during an LS Swap.

Furthermore, addressing the stringent fuel control requirements of high-boost engines, our specialized EFI fuel systems components provide robust support. Every part—from high-flow filters to specialized fuel rails—is precision-engineered to guarantee accurate fuel delivery and consistent pressure under high loads, vital for any modern EFI System. These advanced EFI fuel systems are central to our evil energy fuel systems commitment.

Durability and Customization: The Fuel Line Kit

Durability is central to the quality of EVIL ENERGY fuel systems. Our flagship Fuel Line Kit utilizes high-grade AN fittings and braided hose, offering excellent heat resistance and corrosion protection. These fuel line kit components are modular, allowing users to custom-route their lines, preventing leaks and abrasion, and guaranteeing long-term reliability for your performance vehicle. This superior Fuel Line Kit perfectly complements the performance of our EVIL ENERGY Carburetor (if applicable) or our EFI System kits.

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Explore Subcollections

Fuel System Line Kits

LS-Style Fuel Systems Line Kits

EFI Fuel System Kit

Mastering Your Fuel System

Building a high-performance vehicle requires specialized knowledge. Below are the most frequently asked questions regarding LS Swap projects, EFI fuel systems, and why EVIL ENERGY fuel systems are the trusted choice for enthusiasts.

An LS Swap Fuel System refers to the process of installing a GM Gen III/IV V8 engine into a different vehicle, where 'LS' stands for Luxury Sport—though it is now the industry standard for high-performance swaps. To ensure a successful LS Swap, you need a dedicated Fuel Line Kit that can handle high-pressure requirements. The EVIL ENERGY fuel system is designed to provide the constant, high-volume flow needed for LS engines, making it possible to LS swap almost any vehicle, from classic muscle cars to modern trucks, for improved power and reliability.

An EFI system (Electronic Fuel Injection) uses an onboard computer to precisely control fuel delivery, which significantly improves horsepower and cold-start reliability compared to carburetors. Because EFI fuel systems operate at much higher pressures (typically 43-60+ PSI), a standard rubber hose is insufficient. Utilizing a 6an PTFE Fuel Line Kit ensures your EFI System remains leak-free and compatible with corrosive modern fuels like E85, which can otherwise damage traditional lines.

EVIL ENERGY auto parts are engineered for enthusiasts who demand professional-grade durability at a competitive price point. Choosing an EVIL ENERGY fuel system means you are getting a complete, high-pressure solution—including PTFE fuel lines and precision AN fittings—tested to withstand up to 3000 PSI. Whether you are plumbing a custom LS Swap Fuel System or upgrading a factory EFI System, EVIL ENERGY fuel systems offer the 'one-stop-shop' reliability needed to protect your engine and maximize performance.

FAQs about Fuel System Kits

What are symptoms of a fuel system issue?

Common symptoms of an underlying Fuel System problem include:

Engine Misfires or Rough Idling: Inconsistent fuel delivery to one or more cylinders.
Poor Acceleration or Hesitation: Often caused by a clogged fuel filter or a weak Fuel System pump that cannot maintain pressure under load.
Engine Cranks but Won't Start: A lack of fuel reaching the combustion chamber.
Decreased Fuel Economy: Leaks or improperly functioning injectors (common in older EFI System components).
Check Engine Light (CEL): Often triggered by lean or rich conditions due to incorrect fuel metering.

What does it mean to do a LS swap?

An LS Swap refers to the highly popular modification where a mechanic or enthusiast replaces the original engine in a vehicle (often a classic car, truck, or import) with a modern General Motors (GM) LS-series V8 engine. The LS engine is celebrated for its lightweight design, compact size, reliability, and immense horsepower potential straight out of the box, making it the definitive choice for performance conversions.

What is an EFI system in cars?

EFI stands for Electronic Fuel Injection. The EFI System is a modern Fuel System technology that uses an Electronic Control Unit (ECU) and sensors to precisely determine the required amount of fuel. The ECU signals the injectors to spray the exact amount of fuel directly into the engine, replacing older, less efficient carburetor technology. Our EVIL ENERGY fuel systems often include components designed specifically to support these high-pressure EFI Systems.
Key Advantages of an EFI System:

Improved Fuel Economy: Due to precise fuel metering.
Enhanced Performance: Optimized air-fuel ratios lead to consistent power delivery.
Reliable Cold Starts: The system automatically adjusts for varying temperatures.

Lower Emissions: More complete combustion reduces pollutants.

What is needed to do a LS swap?

Performing an LS Swap is complex and requires several specialized components beyond the engine itself. Key components needed include:

The LS Swap Fuel System (Crucial for providing the high-pressure required by the LS engine's EFI System).
Engine Mounts and Transmission Adapter Plate.
Wiring Harness (Often a custom or standalone harness).
Cooling System Upgrades (Radiator, Hoses).
Custom headers and exhaust.

Is fuel system cleaner good or bad?

Generally, a high-quality Fuel System cleaner is good when used as directed. It helps dissolve varnish and carbon deposits that build up over time in the fuel lines, pump, and injectors. However, excessive or repeated use of aggressive cleaners is unnecessary and can potentially damage sensitive components in older engines or certain EFI fuel systems.

Let customers speak for us

from 1413 reviews

EVIL ENERGY Ignition Coil UF648 Compatible with Chrysler Dodge Jeep 3.6L V6 High Performance Upgrade

Cindy dk

Nice bundle for my 2011 Charger 3.6L

I recently replaced my coil packs and plugs and was happy with them but decided I would give these a try for the sake of testing, since I was replacing my lower intake anyway.

The seals that come with this bundle are the same fit, color/material as the last kit, and they fit the grooves nicely and don‘t fall out. The plugs were not gapped properly, but that’s why we should always check and adjust every plug, which was easy enough.

The coil packs also fit great and, while this doesn‘t really matter, they look cool too (sorry, forgot to take pictures).

Post-install, the car fired right up and purred like a kitten as expected.

Overall, this has been a great bundle for my Charger. I’ll update my review after some significant mileage is put on the parts and/or if I run in to any issues and don‘t worry, the old (barely used) parts are stored for future use!

EVIL ENERGY Ignition Coil UF648 Compatible with Chrysler Dodge Jeep 3.6L V6 High Performance Upgrade

05/13/2026

EVIL ENERGY Cold Air Intake Compatible for 2016-2023 Toyota Tacoma 3.5L, Increases Horsepower, Towing Performance & Acceleration, Includes Heat Shield & Pre-Filter, Black

Jake Michael

2023 tacoma cold air intake.

Put the cold air intake on my 23 tacoma. It has added a noticeable amount of mid range HP and makes the truck sound great as well. If you own a gen 3 tacoma you know the mid range power can be laggy. This intake system is well worth the purchase would recommend it. It also looks great and seems my fuel economy has gotten better because the motor has to work less getting up to speeds. Would recommend 5/5.

EVIL ENERGY Cold Air Intake Compatible for 2016-2023 Toyota Tacoma 3.5L, Increases Horsepower, Towing Performance & Acceleration, Includes Heat Shield & Pre-Filter, Black

05/10/2026

EVIL ENERGY AN Flare to AN ORB Male Fuel Rail Adapter Fitting

Jdr

Awesome ORB

I use the 8an into number 6 ORB and work perfectly to connect to my Boyd's fuel tank

EVIL ENERGY AN Flare to AN ORB Male Fuel Rail Adapter Fitting

05/06/2026

EVIL ENERGY 330mm 10/16/19 Row Oil Cooler Kit 10AN Transmission Universal Engine Cooler

Adam Purkey

Works on my Harley great

I’m shocked how much my oil temp went down on my Harley thanks guys

EVIL ENERGY 330mm 10/16/19 Row Oil Cooler Kit 10AN Transmission Universal Engine Cooler

04/21/2026

EVIL ENERGY Mystery Box – Unbox the Super Value!

Dave Willis

Mystery boxes

I ordered the $20.00 and the $50.00 mystery boxes and i REALLY wish i would've waited to order the prior orders that i had done through Amazon.
I got the black braided fuel line with a BUNCH of AN fittings. Well, that is exactly what i had ordered before, but i had gotten the stainless braided line before and the mystery box saved me a bunch of money. Lol!
The other mystery box i ordered has the black 750 ml catch can. Well, that is exactly what i had ordered before except the one prior is the silverish look and yes, i spent less on the mystery box. Lol! Smdh.
The quality is great.
Shipping for me always takes way longer than most due to living way out in the middle of the Pacific Ocean, Maui. But, I can't blame you guys for that.
I am very happy with the stuff and what i don't use will go to my neighbor who is also upgrading his ride.
My corvette will be making some sweet LS muscle music very soon.
Thank you, Evil Energy!

EVIL ENERGY Mystery Box – Unbox the Super Value!

04/17/2026

Clyde Salas

Great products

I haven't installed yet, but everything that came in the mystery box was excellent!

04/08/2026

EVIL ENERGY Fuel Pressure Regulator 6AN EFI Bypass Return Adjustable 20-140psi Black&Red

Jason Schoenfelder

Worked like a charm.

Added this fuel pressure regulator to my return fuel line on a 460 with a sniper 2 and this fixed all my fuel pressure issues.

EVIL ENERGY Fuel Pressure Regulator 6AN EFI Bypass Return Adjustable 20-140psi Black&Red

03/31/2026

EVIL ENERGY 20FT AN6/8/10 CPE Fuel Line Kit With Push On 18 pcs Fitting

Llevante Williams

Excellent quality

I purchased directly from the company NOT Amazon the kit came well packaged and handled with care. Everything is in the box as listed and was not damaged or used it came on time there were no delays I am very happy with evil energy and will be purchasing again.

EVIL ENERGY 20FT AN6/8/10 CPE Fuel Line Kit With Push On 18 pcs Fitting

03/08/2026

Erick Santos

Fuel lines

Is a very good product ideal product. It works exceptionally.

Worry-Free Purchase

03/06/2026

EvilEnergy Intake Manifold & Grid Heater Delete Plate for 2007–2024 Dodge Ram 2500/3500 6.7L Cummins

Ryan Stieg

Badass

Went on just like it should. Looks great, works great! I would definitely recommend it to anybody wanting to upgrade

EvilEnergy Intake Manifold & Grid Heater Delete Plate for 2007–2024 Dodge Ram 2500/3500 6.7L Cummins

03/01/2026

Evil Energy | Wheel Spacers 6X5.5 for Ram 1500 (2019-2023) - 1.5 Inch Centric Tire Spacer, Set of 4

Darren Grinchuk

Ram Hemi 2 inch spacers

Fantastic product.it gave my truck a fantastic stance. 100 percent recommend.

Evil Energy | Wheel Spacers 6X5.5 for Ram 1500 (2019-2023) - 1.5 Inch Centric Tire Spacer, Set of 4

02/27/2026

EVIL ENERGY Fit for Ford F150 2009-2014 Full LED Taillights , New Upgrade Smoked Black Rear Brake Stop/Reverse Lights/Parking Lights/Turn Signal Tail Lamp (2PCS, Passenger & Driver Side)

Don

Perfect

Bought and installed these today. They only took 20 minutes maybe to install. They fit perfect and look perfect. They match my tuxedo black paint great. They are bright when they need to be.

EVIL ENERGY Fit for Ford F150 2009-2014 Full LED Taillights , New Upgrade Smoked Black Rear Brake Stop/Reverse Lights/Parking Lights/Turn Signal Tail Lamp (2PCS, Passenger & Driver Side)

01/13/2026

EVIL ENERGY 92MM Mechanical Throttle Body for LSX LS1 LS2 LS3 LS6 LS7 for GM Gen III with IAC 4 Bolt

Alexander Melendez

Evil Energy 92mm on a sheet metal intake

Looks well built. Packaging was correct. I intalled it on my intake but not on truck yet. Need to run my Evil Energy fuel lines with fuel pressure regulator.
Will update when done . All good right now.

EVIL ENERGY 92MM Mechanical Throttle Body for LSX LS1 LS2 LS3 LS6 LS7 for GM Gen III with IAC 4 Bolt

12/12/2025

EVIL ENERGY 6AN 3/8-inch PTFE LS Swap EFI Fuel Line Fitting Kit | E85 Nylon Braided Fuel Hose With Fittings 10-26FT

Bruce Bradley

S10 Fuel System

Fittings are super easy to install. I had a problem with an order but the guys were very helpful and took care of it. Shipping really quick and received in perfect condition.

EVIL ENERGY 6AN 3/8-inch PTFE LS Swap EFI Fuel Line Fitting Kit | E85 Nylon Braided Fuel Hose With Fittings 10-26FT

12/11/2025

EVIL ENERGY Cold Air Intake Compatible for 2012-2018 Jeep Wrangler JK 3.6L, Increases Horsepower, Towing Performance & Acceleration, Includes Heat Shield & Pre-Filter, Black

PINOY DRAGON

Amazing difference

Smooth install, amazing difference, can't beat the price. The sound is pretty kool!!!

EVIL ENERGY Cold Air Intake Compatible for 2012-2018 Jeep Wrangler JK 3.6L, Increases Horsepower, Towing Performance & Acceleration, Includes Heat Shield & Pre-Filter, Black

11/25/2025

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Fuel System Kits

EVIL ENERGY Fuel Systems—Unleash Engine Potential

Performance Foundation: The Quality of EVIL ENERGY Fuel Systems

Solutions for Modern Swaps: LS Swap and EFI Systems

Durability and Customization: The Fuel Line Kit