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 921 reviews

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

Pinoy Dragon

Smooth install great sounds!!!

Easy install, quick shipping, great performance!!!!

11/17/2025

EVIL ENERGY 4/6/8/10AN CPE Fuel Line Kit Black Nylon Braided Fuel Hose Fitting Kit 20FT/25FT

Kyle Bateman

25FT. 6AN. Kit.

I am extremely satisfied with this product , it was easy to order and has high quality fittings and lines .
I will be glad to use Evil Energy again in the future .
Kyle...

EVIL ENERGY 4/6/8/10AN CPE Fuel Line Kit Black Nylon Braided Fuel Hose Fitting Kit 20FT/25FT

11/16/2025

EVIL ENERGY Baffled Oil Catch Can Oil Separator Catch Can 300ml Universal Aluminum Black

Christopher Morris

Missing parts twice

I ordered the catch can kit. First I got a catch can in a box with no packing and nothing else. Sent email with pics. They sent the mounting bracket and hose. Still missing the fittings.

EVIL ENERGY Baffled Oil Catch Can Oil Separator Catch Can 300ml Universal Aluminum Black

10/19/2025

EVIL ENERGY Quick Fuel 750 CFM 4-barrel Carburetor Mechanical Secondary

Jake Miller

Preform Carb

Better than I expected, the EVIL ENERGY carburetor runs well right after starting, and the polished surface looks finely finished, not like it was unevenly polished by a buffing wheel.

EVIL ENERGY Quick Fuel 750 CFM 4-barrel Carburetor Mechanical Secondary

10/13/2025

Fuel cell

Have not installed yet. Seemed to be of good quality. Received in a timely manner.

EVIL ENERGY 5/10/15/20 Gallon Fuel Cell Gas Tank Aluminum with Level Sender 6AN 12FT/16FT PTFE Fuel Line Kit Black/silver

10/06/2025

EVIL ENERGY V7 Brightest 150W 360° Full IIlumination 9005/HB3 9006/HB4 6500K White 45000LM IP68 LED Headlight Bulbs 2 Pcs

abdullah uzair

Incredible brightness upgrade!

Just installed these on my car and the difference is unbelievable. The 6000K white light is so crisp and clean - night driving feels completely safe now. Easy plug-and-play installation.

EVIL ENERGY V7 Brightest 150W 360° Full IIlumination 9005/HB3 9006/HB4 6500K White 45000LM IP68 LED Headlight Bulbs 2 Pcs

09/24/2025

Greg Faircloth

Great for country roads

I live in rural Montana where deer are a real hazard. These lights give me that extra reaction time. Can see at least 50% further than stock halogens.

EVIL ENERGY P2 130W LED Headlight Bulbs DC 9-32V 9005/9006 6500K 40000LM Automotive LED Headlights 2Pcs

Gary Johnson

Amazing bulbs

Great bulbs. Easy to install and very bright.

EVIL ENERGY P2 130W LED Headlight Bulbs DC 9-32V 9005/9006 6500K 40000LM Automotive LED Headlights 2Pcs

Austin Gazda

Great bright light

Amazing lights! Beam is bright and wide. The price can’t be beat. Handles heat great, the separate block handles heat better than the all in one. I have ran multiple brands, my friends run the Ultra 3 and these blow them out of the water.

09/23/2025

EVIL ENERGY RD09 Bullet 9005/9006 130W 360°Full Illumination LED Headlight Bulbs 900% Brighter Than Halogen and 60000Hrs Lifespan

Jeff Vorodi

Would buy again in heartbeat

After 1 months of daily use, these bulbs have exceeded all expectations. Perfect performance, great price point.

EVIL ENERGY RD09 Bullet 9005/9006 130W 360°Full Illumination LED Headlight Bulbs 900% Brighter Than Halogen and 60000Hrs Lifespan

09/22/2025

Dorian Paddlety

Good headlamps

it works as design

09/21/2025

Alex Hash

Nice output

These are awesome. Nice and bright and seem to last for a bit

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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