Fuel Pressure Regulators Kits

Improve your fuel system with EVIL ENERGY Fuel Regulators. Our selection includes carburetor fuel pressure regulators, inline fuel pressure regulators, EFI fuel pressure regulators, LS fuel pressure regulators, and high-flow regulators. Each product offers precise fuel control and long-lasting performance, catering to both car enthusiasts and performance builders.

With a commitment to quality, EVIL ENERGY fuel pressure regulators  & Accessories are rigorously tested to ensure optimal functionality and long-lasting service. Whether you're upgrading your fuel system or replacing worn-out components, our regulators provide a dependable solution to support your vehicle's performance.

Key Features of Fuel Pressure Regulators

  • Carburetor Fuel Pressure Regulators: These regulators are specifically designed for carbureted engines, providing consistent fuel pressure for stable engine performance and efficient fuel delivery.
  • Inline Fuel Pressure Regulators: Suitable for both carbureted and fuel-injected engines, inline fuel pressure regulators maintain stable fuel pressure, ensuring optimal fuel flow and system balance.
  • LS Fuel Pressure Regulators: Tailored for LS engine applications, these regulators offer accurate fuel control, supporting high-performance and efficiency in modern engine setups.
  • EFI Fuel Pressure Regulators: Designed for vehicles with electronic fuel injection (EFI) systems, these regulators provide precise fuel pressure regulation, ensuring reliable engine operation and performance.
  • High Flow Fuel Pressure Regulator Gauges: These regulators, featuring an integrated gauge, are ideal for high-flow applications, offering clear pressure monitoring for performance vehicles and racing setups.
  • Return Style Fuel Pressure Regulators: Engineered for return-style fuel systems, these regulators ensure optimal fuel return and consistent pressure, contributing to system efficiency and reliability.
  • Adjustable Pressure Range: Choose from regulators with pressure ranges of 20–140 PSI, ideal for automotive fuel pressure regulator setups on both EFI and carburetor platforms.
  • Durable Construction: Made with corrosion-resistant aluminum and anodized finishes to withstand high pressure and heat.
  • Integrated Filtration: Select models include built-in 10-micron stainless steel fuel filters for optimal fuel purity and system longevity.
  • Plug-and-Play Kits: Complete kits with fuel lines, AN fittings, pressure gauges, and mounting hardware for fast, secure installation.

Browse popular kits like our EFI returnless fuel system regulator kit, or get started with our universal adjustable fuel pressure regulator.

Designed for Versatility

These regulators are compatible with gasoline, E85, and methanol fuels (not for diesel), and are optimized for EFI return and returnless systems. Whether you're doing an LS swap fuel system install, upgrading a boosted build, or restoring classic fuel delivery, we have the auto fuel pressure regulator that fits your needs.

We also offer fuel pressure regulator bundles for maximum value and convenience.

Best-Selling Regulators

 

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High Performance Fuel Pressure Regulators

In high-performance automotive powertrain upgrades and maintenance, precise fuel pressure management is the cornerstone of maximizing engine efficiency. EVIL ENERGY’s high-performance fuel pressure regulator line-up delivers comprehensive fueling solutions tailored for everything from high-pressure fuel injection (EFI) systems to classic carburetor configurations. Whether you need to stabilize modern electronic fuel injection demands or seek reliable low-pressure control for a custom build, our products offer the perfect blend of precision and track-tested durability. Explore our complete fuel pressure regulators accessories collection to find the exact setup for your vehicle.

Adjusting your fuel pressure on a carbureted setup requires a methodical approach to ensure system sealed safety and precision tuning:
1. Get an All-in-One Setup: To streamline your installation and tuning process, it is highly recommended to choose a complete fuel pressure regulator kit. Our high-performance fuel regulator kit comes fully equipped with a precise pressure gauge, professional adapter fittings, and high-grade braided lines to give you a true plug-and-play hardware solution.
2. Plumb the Lines & Gauge: Mount the regulator in the engine bay before the carburetor inlet, ensuring the fuel pressure gauge is securely installed to monitor real-time pressure.
3. Start the Engine: Fire up the vehicle and let it idle. Loosen the locknut on top of the regulator adjustment screw.
4. Tune the Pressure: Use a screwdriver to slowly turn the adjustment screw clockwise to increase fuel pressure, or counterclockwise to decrease it. Watch the gauge until it reads the exact PSI recommended by your carburetor manufacturer.
5. Lock It In: Once finalized, tighten the locknut down while holding the adjustment screw steady. Carefully inspect all fuel line fittings for leaks.

Yes, absolutely. Carbureted engines are highly sensitive to fuel delivery pressure. Standard mechanical or aftermarket high-pressure fuel pumps often output pressures that far exceed what a carburetor can handle (which typically requires a low 4-7 PSI). Excessive pressure will force past the needle and seat, causing the carburetor to flood, run rich, or stall the engine.

To prevent this, you need a dedicated carb fuel pressure regulator engineered specifically to reduce and stabilize the fuel pump's output pressure down to the ideal low-PSI range. By installing a premium-grade carburetor fuel pressure regulator, you can eliminate common fueling issues like erratic idling, fuel bogging, and high-RPM starvation, allowing your classic car or custom race rig to unleash its full power reliably.

When a fuel pressure regulator fails or its internal diaphragm degrades over time, your vehicle will exhibit several distinct warning signs:
1. Engine Misfires & Sudden Power Loss: In modern EFI applications, if the unit fails to hold high pressure, it will cause a severe lean condition. Upgrading to a professional-grade high-pressure fuel regulator is vital to restoring a constant, reliable fuel rail pressure.
2. Black Smoke & Poor Fuel Economy: If the regulator gets stuck closed, fuel pressure spikes drastically, forcing excess fuel into the cylinders and causing a rich condition.
3. Rough Idling & Decreased Throttle Response: Erratic fuel pressure fluctuations lead to severe engine hesitation and unstable RPMs.
4. Fuel in the Vacuum Line: If you pull the vacuum reference line and notice raw fuel inside, it means the internal rubber diaphragm has ruptured, requiring an immediate replacement.
Pro Expert Tip: For high-horsepower, track-driven, or long-endurance setups, we strongly recommend utilizing a modern fuel pressure regulator with return (bypass style). This advanced design allows surplus fuel to flow freely back to the gas tank, which not only yields vastly superior, dynamic pressure regulation but also continuously cycles the fuel to prevent heat soak and 'vapor lock' issues in hot engine bays.

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Featured Products

EVIL ENERGY PTFE Hose End Fitting for PTFE Hose Only (3/4/6/8/10/12AN) - Black - EVILENERGY[Straight,1PC]
EVIL ENERGY PTFE Hose End Fitting for PTFE Hose Only (3/4/6/8/10/12AN) - Black

Engineered for high-pressure, high-temperature fuel systems, the EVIL ENERGY PTFE Hose End Fitting delivers leak-proof performance for PTFE fuel lines in performance builds, LS swaps, boosted engines, and ethanol-based fuel setups. Made from 6061-T6 aluminum with a 360° swivel design, these AN fittings ensure a clean, secure, and easy-to-assemble connection—ideal for builders who demand durability and precision.

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[Black,Without Bracket] black inline evil energy fuel filter with directional arrow and multiple AN fuel line fittingsevil energy fuel filter kit with stainless steel inline fuel filter, AN fittings, and mounting hardware
EVIL ENERGY Inline Fuel Filter with 6AN 8AN 10AN Adapter and Bracket Universal 10/30/40/100 Micron - Black

[Application] Universal fuel filter, includes an6, an8, an10 adapters for different size applications. With mounting bracket keeps the engine bar stylish and clean.

  • [Material] Aluminum alloy fuel filter can and stainless steel filter element.
  • [O-ring] The o-ring provides a tight seal for fittings and end caps.
  • [Function] Can be used for filtering gasoline, diesel, etc. Captures contaminant particles of 10 micron and above to protect the fuel system of the vehicle.
  • [Feature] Removable design, easy to clean or replace filter element at regular time.
  • [Installation Tips] We have debugged the installation direction of the fuel filters before delivery. Please check and ensure the closed end of the filter element docks with the spring. Let the liquid flow following the arrow from the spring end to the other end, and the fuel filter will serve longer.
$23.99
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[20FT] EVIL ENERGY PTFE Fuel Line Kit, complete black hose & fittings set, 180-day return[16FT] EVIL ENERGY PTFE Fuel Line Kit, black braided hose, fittings, free shipping & return
EVIL ENERGY 4/6/8/10AN PTFE Fuel Line Kit | E85 Nylon Braided Hose | 16/20FT Black Black with Comprehensive Fittings

Three-Layer Construction: Our fuel lines are constructed with a triple-layer material for unparalleled performance and protection. The innermost layer is made of PTFE for maximum chemical resistance, a braided stainless steel layer for strength and durability, and an outer nylon layer for added abrasion resistance and protection.

Multiple Sizes: We offer our fuel lines in 4AN, 6AN, 8AN, and 10AN sizes, catering to the diverse needs of various fuel delivery systems.

Fitting Types: Our kit includes a variety of fittings at 0°, 90°, 45°, and 180° angles, ensuring versatility and flexibility during installation, allowing for custom routing in tight or complex spaces.

Precision Fit and Leak-Free Performance: The combination of the PTFE inner layer and the high-quality aluminum hose ends ensures a precision fit and leak-free connection, even under extreme pressure, providing a safe and reliable fuel system.

$62.09
$62.09
$70.99
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[20FT] EVIL ENERGY PTFE Fuel Hose Kit, complete black braided hose & fittings set[10FT] EVIL ENERGY PTFE Fuel Hose Kit, complete black braided hose & fittings set
EVIL ENERGY 6AN 3/8-inch PTFE LS Swap EFI Fuel Line Fitting Kit | E85 Nylon Braided Fuel Hose With Fittings 10-26FT

PTFE nylon braided fuel line kit offers superior durability for high-pressure and high-temperature applications, making it perfect for EFI systems, turbo setups, and all automotive fuels.

$76.99
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$112.49
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  • [20-75PSI&75-120PSI,Red][20-75PSI&75-120PSI,Blue]
    EVIL ENERGY Fuel System Upgrade Bundle - 300LPH High Flow Electric Fuel Pump, Adjustable AN Fitting Wrench (3-16AN), & 20-140psi Fuel Pressure Regulator
    ---!@!start!@!---Specifications---!@!end!@!--- EFI Bypass Return Adjustable Fuel Pressure Regulator Compatible Systems Most vehicles' Electronic Fuel Injection (EFI) systems Fuel Compatibility Gasoline, E85, alcohol/ethanolNot compatible with diesel fuel; Nylon braided fuel lines not compatible with E85 Pressure Adjustment Range 30-70PSI 20-75&75-120PSI 30-80&80-140PSI Main Fitting Size 30-70PSI:6AN...
    $154.99
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  • [3/8 inch NBR Fuel Hose][6AN PTFE Fuel Line]
    EVIL ENERGY Carburetor Fuel System Kit 12V Electric Fuel Pump 5-12PSI Regulator 20FT PTFE/NBR Hose

    Important Note: The PTFE Fuel Line Kit does not include connecting adapters. Please purchase the corresponding fittings separately if required for your installation.

    $159.99
    $159.99
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  • [30-70PSI,With Wrench][30-70PSI,Without Wrench]
    EVIL ENERGY All-in-One EFI Fuel System Bundle|EFI Bypass Fuel Pressure Regulator & CPE Fuel Line & Adjustable 3-16AN Wrench (Black)

    Core Components: EFI bypass fuel pressure regulator (30-70PSI/20-120PSI), CPE fuel line kit (6AN+8AN/8AN+10AN, 20FT x 2), adjustable 3-16AN wrench (optional).

    Key Benefits: Pre-matched compatibility (no mismatched parts); tailored variants for daily/modified/racing use; durable 6061-T6 aluminum (regulator) + reinforced CPE (lines); 1-year warranty.

    Applications: Most EFI vehicles (LS swaps, import tuners, race cars); fuel supply/return lines, transmission cooler lines, turbo lines.

    What's Included: Regulator + gauge + fittings, fuel lines + swivel fittings, optional wrench + nylon jackets, thread sealant tape, installation guide.

    Fuel Compatibility: Gasoline, E85, alcohol/ethanol (no diesel); avoid nylon lines for E85.

    $183.99
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  • EVIL ENERGY EFI Fuel Pressure Regulator Kit Adjustable (20-120PSI) with 6AN CPE/PTFE Fuel Line Kit(black) - EVILENERGYEVIL ENERGY EFI Fuel Pressure Regulator Kit Adjustable (20-120PSI) with 6AN CPE/PTFE Fuel Line Kit(black) - EVILENERGY
    EVIL ENERGY EFI Fuel Pressure Regulator Kit Adjustable (20-120PSI) with 6AN CPE/PTFE Fuel Line Kit(black)

    Core Advantages

    • Universal fit for most EFI systems; compatible with gasoline/E85/alcohol (regulator only).
    • Dual pressure ranges: 20-75psi (standard) / 75-120psi (high-performance).
    • All-in-one kit with gauge, fittings, tools, and sealant.

    Specs & Details

    • Regulator compatibility: Gasoline/E85/alcohol (no diesel); Fuel line: Not E85-compatible.
    • Adjustment: Set screw + interchangeable springs; Allen key included.

    Application & Note

    • Suitable for street cars, high-performance builds, racing vehicles.
    • Professional installation recommended; use sealant tape for NPT port.
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  • EVIL ENERGY 20-120PSI EFI Fuel System Kit with 300LPH Inline Fuel Pump & 10 Micron Fuel FilterEVIL ENERGY 20-120PSI EFI Fuel System Kit with 300LPH Inline Fuel Pump & 10 Micron Fuel Filter
    EVIL ENERGY 20-120PSI EFI Fuel System Kit with 300LPH Inline Fuel Pump & 10 Micron Fuel Filter
    Brand EVIL ENERGY Fuel Pressure Regulator 20-120PSI External Inline Fuel Pump Test Flow:300 LPH (43 PSI&13.5V)Operating Pressure:75PSI Fuel Filter Mounting Bracket ID:50mm+60mm (with the insert) Fuel Filter 10 Micron Package Fuel Pressure Regulator*1 External Inline Fuel Pump *1 10 Micron Fuel Filter*1 Bracket *2...
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    EVIL ENERGY Upgraded Fuel Cell Tank Kits-Efficient Fuel System Solutions 5/10/15 Gallon

    Package Includes：

    1. Fuel Cell Gas Tank‎*1（5 / 10 / 15 Gallon Optional)
    2. Fuel Pressure Regulator*1
    3. 300LPH Inline Fuel Pump Electric*1
    4. ‎6AN to M18*1.5 Fitting Adapter*1
    5. M12*1.5 to 6AN Fitting Adapter*1
    6. 50mm Fuel Filter Mounting Bracket*2
    7. 60mm Fuel Filter Mounting Bracket*1
    8. 20FT 6AN CPE/PTFE/Antistatic PTFE Fuel Line*1
    9. AN10 to AN6 Male Flare Reducer Adapter*2
    10. 100 Micron Inline Fuel Filter with 6AN 8AN 10AN Adapter*1
    11. 10 Micron Inline Fuel Filter with 6AN 8AN 10AN Adapter*1
    12. 90 Degree Fittings *4
    13. 0 Degree Fittings *8
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  • EVIL ENERGY Complete Carbureted Fuel System Bundle with 12V Fuel Pump, Pressure Regulator and Fuel FilterInstallation diagram for the EVIL ENERGY 12V Electric Fuel Pump for Carb, showing the correct placement of a 100-micron pre-filter, a 40-micron post-filter, and a fuel pressure regulator.
    EVIL ENERGY Complete Carbureted Fuel System Bundle with 12V Fuel Pump, Pressure Regulator and Fuel Filter

    Universal for Carbureted Systems（1960s–1980s Muscle Cars,Hot Rods,Motorcycles,Generators,Classic Car Restorations,Modified Carbureted Vehicles)

    $188.99
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  • [30-70PSI,Red][20-75PSI&75-120PSI,Black]
    EVIL ENERGY EFI Fuel System Kit – Adjustable Fuel Pressure Regulator (6AN, 20–140 PSI) + 25FT Aluminum Coiled Fuel Line Hard Tubing (3/8-inch & 5/16-inch) - Red
    ---!@!start!@!---Specifications---!@!end!@!--- Brand EVIL ENERGY Product Type EFI Bypass Return Adjustable Fuel Pressure Regulator Compatible Systems Most vehicles' Electronic Fuel Injection (EFI) systems Fuel Compatibility Gasoline, E85, alcohol/ethanolNot compatible with diesel fuel; CPE fuel lines not compatible with E85 Pressure Adjustment Range 30-70PSI/20-75&75-120PSI/30-80&80-140PSI Main Fitting...
    $135.99
    $135.99
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    • Black
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FAQs about Fuel Pressure Regulators Kits

What is a fuel pressure regulator, and how does it work?

A fuel pressure regulator maintains a constant fuel pressure within the fuel system. It regulates the pressure between the fuel pump and injectors to ensure the engine receives the correct amount of fuel for optimal performance.

The type of fuel pressure regulator you need depends on your vehicle's fuel system. If you're using a carburetor, choose a carburetor fuel pressure regulator. For fuel-injected systems, select an EFI fuel pressure regulator. For high-performance needs, opt for a high-flow fuel pressure regulator.

Signs that your fuel pressure regulator may need replacement include difficulty starting the engine, rough idling, poor acceleration, or a drop in engine power. Fuel pressure issues can also lead to inconsistent fuel delivery, affecting overall performance.

A high-flow fuel pressure regulator is designed for high-performance and racing applications, offering greater fuel flow to meet the demands of high-output engines. It typically includes an integrated pressure gauge for easier monitoring of fuel pressure in demanding setups.

Yes, upgrading your fuel pressure regulator is an important part of any fuel system upgrade. If you're replacing components like the fuel pump, injectors, or upgrading to a higher performance setup, the fuel pressure regulator should be matched to these changes. A fuel pump upgrade, for instance, may increase the fuel flow, which will require a higher capacity or high-flow regulator to maintain proper pressure levels.

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