SPECIFICATIONS DESCRIPTION INSTALLATION GUIDE SHIPPING & RETURN VIDEOS & BLOGS FAQS REVIEWS

SPECIFICATIONS
DESCRIPTION
INSTALLATION GUIDE
SHIPPING & RETURN
VIDEOS & BLOGS
FAQS
REVIEWS

Product Details

Specification	Details
Regulator type	adjustable bypass fuel pressure regulator for return-style electronic fuel injection (EFI) systems
Pressure ranges	20-75 PSI&75-120 PSI
Adjustment and readout	Top-mounted adjustment screw with an included Allen key and fuel pressure gauge
Fuel line options	6AN CPE or 6AN PTFE, depending on the selected kit
Regulator fuel compatibility	Gasoline, E85 and alcohol/ethanol fuels. Do not use this regulator with diesel.
Fuel hose selection	For E85, select the PTFE hose option. The nylon-braided CPE hose is not compatible with E85. For other blends, check the rating of the selected hose.
Connection hardware	6AN hose ends, 6AN-to-6AN ORB and 6AN-to-10AN ORB adapters, and a 10AN port plug
Gauge connection	NPT pressure gauge port

Package Contents

1 adjustable bypass fuel pressure regulator with the 20-75 PSI spring installed
1 fuel pressure gauge and 1 replacement spring for 75-120 PSI
1 length of 6AN fuel hose in the selected material, CPE or PTFE
1 × 6AN-to-6AN ORB adapter and 2 × 6AN-to-10AN ORB adapters
6 × 6AN hose ends: 2 straight, 2 at 45° and 2 at 90°
1 × 10AN port plug and 1 hose separator clamp
1 Allen key and 1 roll of thread sealant tape

DESCRIPTION

About this item

EVIL ENERGY delivers a complete adjustable EFI fuel pressure regulator kit built for return-style electronic fuel injection. The bypass regulator ships with two interchangeable springs - 20-75 PSI installed and 75-120 PSI as a spare - plus an included gauge, a length of 6AN fuel line (CPE or PTFE) and every fitting you need to route it through the engine bay. Set pressure at the regulator, read it on the gauge, and fine-tune with the top screw.

Key Features

DUAL-RANGE ADJUSTABLE: 20-75 PSI spring installed, plus a 75-120 PSI replacement spring for high-pressure builds; the top adjustment screw fine-tunes within the selected range.
BYPASS REGULATOR FOR RETURN EFI: holds steady pressure and returns excess fuel to the tank; built for return-style EFI systems - not for return-less setups.
6AN FUEL LINE OPTIONS: choose nylon-braided CPE for gasoline, or PTFE for E85 / alcohol blends (CPE is not E85-rated).
COMPLETE HARDWARE: 6 × 6AN hose ends (2 straight, 2 × 45°, 2 × 90°), 1 × 6AN-to-6AN ORB and 2 × 6AN-to-10AN ORB adapters, 1 × 10AN port plug, gauge, Allen key, sealant tape and a hose separator clamp.
GAS / E85 / ALCOHOL - NOT DIESEL: the regulator is rated for gasoline, E85 and ethanol; pick the PTFE hose for E85 and never run diesel through this kit.

Fitment

This kit fits return-style EFI fuel systems - GM LS V8 swaps, Ford Coyote builds, turbo and high-horsepower applications that regulate pressure with a mechanical bypass regulator and a fuel return line. Before ordering, confirm your setup has a return line, that the supplied 6AN ORB adapters match your rails and pump, and that you have clearance for the regulator and gauge. It is not for diesel, carbureted, or return-less EFI systems. Pair it with our 6AN PTFE fuel line kit or AN push-lock fuel hose; for carbureted builds see the carburetor fuel pressure regulator.

Set Fuel Pressure for Your Return-Style EFI Build

The EVIL ENERGY adjustable EFI fuel pressure regulator kit lets you set fuel pressure and read it at the regulator using the included gauge. Two interchangeable springs cover different pressure requirements, while straight, 45° and 90° hose ends give you options for routing the 6AN line around your engine bay.

EVIL ENERGY EFI fuel pressure regulator kit with 6AN fuel line overview

Choose the 6AN Fuel Line That Matches Your Fuel

6AN CPE fuel line. Choose the nylon-braided CPE option for a gasoline build after checking your fuel blend against the hose rating. Do not use the CPE hose with E85.

6AN CPE fuel line option for the EFI regulator kit

6AN PTFE fuel line. Choose the PTFE option for an E85 build. Check that the pump, injectors, seals and remaining fuel lines are also rated for your fuel. Neither regulator kit is suitable for diesel.

6AN PTFE fuel line option for the EFI regulator kit

Match the Spring to Your EFI Pressure Specification

Check the fuel pressure specified for your EFI system before choosing a spring. For example, a 58 PSI target falls within the installed spring's 20-75 PSI range. For a target above 75 PSI, use the included 75-120 PSI spring. The top adjustment screw lets you fine-tune pressure within the selected range and check the setting on the gauge.

Adjustable bypass fuel pressure regulator spring and adjustment screw detail

Check Your Return Line and Connections Before Ordering

Confirm that your EFI system uses a fuel return line, that the supplied adapters match your connections, and that you have room for the regulator and gauge. The three hose-end angles let you choose the approach that best suits your layout.

EVIL ENERGY bypass fuel pressure regulator application guide

Installation Note

Use the supplied thread sealant tape on the NPT pressure gauge threads as directed in the installation instructions. Professional installation is recommended.

Why Choose EVIL ENERGY EFI Fuel Pressure Regulator Kit?

Two springs, one regulator - the 20-75 PSI and 75-120 PSI springs cover naturally aspirated and boosted EFI builds, so you tune pressure to the spec instead of buying a second regulator.
Bypass design for stable pressure - returns excess fuel to the tank and holds steady pressure across the RPM range, protecting injectors and the pump from spikes.
6AN hardware included - CPE or PTFE line plus 6AN hose ends and ORB adapters, so the kit drops onto most return-style EFI rails without a second order.
Fuel-rated materials - choose PTFE for E85 / alcohol; gasoline builds run the lighter CPE line. Both options are selected to match the regulator's fuel compatibility.
Warranty & support - 1-year warranty, 90-day free returns, and free fitment help by email at support@ievilenergy.com.

INSTALLATION GUIDE

Moderate Estimated Time: 1-2 hours

Tools Required

Socket set and ratchet
Combination wrench set
AN wrench set
Screwdriver set
Pliers
Marker
Drill and drill bits (if required)
Safety glasses
Fuel-resistant gloves

Pre-Installation Checklist

Relieve fuel system pressure, turn the ignition OFF, and disconnect the negative battery cable.
Verify the regulator, selected AN6/AN8/AN10 to AN10 ORB fittings, AN6 to AN6 ORB return fitting, port plug, gauge, Allen key, sealant tape, and replacement spring are present.
Select a mounting position away from exhaust manifolds and other high-temperature surfaces.
Identify the 1/8-inch NPT gauge port, 5/32-inch vacuum/boost reference port, ORB-10 inlet/outlet ports, and ORB-06 return port.

Installation Steps

Remove the old regulator after disconnecting its vacuum line, fuel lines, and mounting hardware.
Secure the new regulator with the supplied bracket in a cool accessible location.
Install the fuel pressure gauge in the 1/8-inch NPT port using appropriate thread sealant.
Install the required ORB fittings and O-rings; plug only an unused side fuel port, not the vacuum/boost reference port.
Connect the fuel rail outlet to a regulator side port and connect the ORB-06 return port to the fuel cell return line.
Connect the vacuum/boost reference hose if applicable; otherwise leave the reference port open to atmosphere.
Prime the system, inspect for leaks, start the engine, and adjust pressure clockwise to increase or counterclockwise to decrease while monitoring the gauge.
Tighten the adjustment jam nut to lock the setting.

Post-Installation Verification

Confirm the regulator and all fittings are secure and away from heat.
Verify the gauge is connected and the vacuum/boost reference port is configured correctly.
Inspect all regulator connections for leaks before and after starting the engine.
Recheck pressure and leaks after the road test and after 50-100 km.

Troubleshooting

Low or high pressure: verify pressure with the gauge and adjust the regulator to the required specification.
High pressure: inspect the return line for kinks, restrictions, or incorrect routing.
Fluctuating pressure: inspect for air leaks and verify the vacuum/boost reference connection.
A slight air leak at the adjustment screw during vacuum/air testing or loss of residual pressure after pump shutdown may be normal.

Maintenance

Inspect regulator mounting, gauge, reference hose, fuel lines, and fittings periodically.
Recheck pressure and all connections after the initial road test and repair any leak before operation.

View Full Installation Guide →

SHIPPING & RETURN

Brand Summary

Policy	Details
Cancellation Policy	Orders can be canceled within 48 hours of placement. Refund processed in 3-5 business days.
Returns Policy	Returns accepted within 180 days. Full refund within 90 days; 15% fee for 90-180 days.
Non-Returnable Items	Only regular-priced items are eligible for refunds; sale items are non-refundable.
Refund Processing	If no refund received, check your bank/credit card. For ongoing issues, contact support@ievilenergy.com.

Return Reasons

Quality Issues: Provide photos/videos; we cover return shipping.
Wrong Item Ordered: Buyer covers return shipping; email within 30 days.
Change of Mind: Buyer covers return shipping; email within 30 days.
Shipping Damage: Inspect packages; do not sign for damaged items.
Incorrect Item Shipped: Contact within 7 days.

Price Protection Policy

Effective from August 25, 2024. Price drops within 7 days of purchase can be claimed.

Disclaimer

EVIL ENERGY reserves the right to interpret, modify, or terminate this policy in accordance with applicable laws and regulations.

If you need further information or assistance, feel free to ask!

VIDEOS & BLOGS

What is a Fuel Pressure Regulator?

A fuel pressure regulator is essential for maintaining stable fuel delivery in a vehicle’s engine, directly impacting performance, efficiency, and emissions. This article explains how it works, its key components, and different types. It also highlights com...

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How to Adjust New Fuel Pressure Regulator: A Simple Guide

Want a smoother ride? Adjusting your fuel pressure regulator is key! Learn how to adjust a fuel pressure regulator with this professional step-by-step guide. Key steps include identifying the FPR, disconnecting the vacuum reference line to establish a stati...

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Fuel Pressure Regulator Troubleshooting: The Ultimate Diagnostic Guide for Modern & Classic Engines

Is your engine stalling, misfiring, or struggling to start? These common fuel pressure issues often point to a single culprit: a faulty fuel regulator. This comprehensive guide serves as your diagnostic hub for identifying fuel regulator symptoms across cla...

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Diagnostic guide comparing fuel pressure sensor and regulator showing P0191 trouble code, symptoms, and causes of fuel pressure sensor failure

Bad Fuel Rail Pressure Sensor Symptoms: Is Your Sensor Faulty?

Symptoms of a bad fuel pressure sensor often mimic mechanical fuel pump failure, leading to engine stalling, rough idling, and poor acceleration. While the fuel rail pressure sensor acts as the system's 'eyes' (sending electronic data to the ECU), the regul...

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Low Fuel Pressure Guide: Causes, Symptoms, and Professional Fixes

Low fuel pressure occurs when the fuel system fails to maintain the necessary PSI, leading to engine stalling, misfires, and decreased power. Common low fuel pressure causes range from clogged filters and failing regulators to weak fuel pumps. To diagnose a...

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A comprehensive infographic guide on how to test a fuel pressure regulator featuring vacuum tests, dynamic pressure tests, and static hold diagnostics for EFI and LS swaps.

How to Test a Fuel Pressure Regulator: A Step-by-Step Diagnostic Guide

Learning how to test a fuel pressure regulator is the first line of defense against engine misfires and poor performance. This comprehensive diagnostic guide walks you through three professional methods—vacuum hose inspection, dynamic gauge testing, and sta...

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EVIL ENERGY adjustable EFI fuel pressure regulator with liquid-filled gauge installed on a performance engine.

Symptoms of a Bad Fuel Pressure Regulator: 10 Warning Signs You Shouldn’t Ignore

Identifying bad fuel pressure regulator symptoms is critical for maintaining engine health and preventing costly performance failures. This guide provides a deep-dive analysis into the 10 most frequent signs of a bad fuel regulator, ranging from visual cues...

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A split-screen comparison infographic for fuel system troubleshooting. The top section shows a BMW engine (N52/N54) with a diagnostic tool displaying code 'P0172' and a fuel gauge, labeled 'SYSTEM RICH CODES.'

Troubleshooting BMW & Duramax: LB7 Fuel Pressure Regulator Symptoms & Guide

This article provides a comprehensive technical breakdown of fuel pressure regulator (FPR) failure across two distinct platforms: high-precision BMW gasoline engines and heavy-duty Duramax LB7 diesels. We explore the critical warning signs—ranging from BMW'...

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How to Test a Fuel Pressure Regulator: Comprehensive Step-by-Step Guide

A faulty fuel pressure regulator can cause rough idling, poor fuel economy, and hard starts—but how do you know it's the real issue? In this guide, you'll learn how to test a fuel pressure regulator step by step using simple tools like a pressure gauge and ...

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FAQS

Q1: Is the regulator compatible with E85 fuel?
A1: Yes, the regulator itself is compatible with E85, gasoline, and alcohol/ethanol. Note: The included AN6 CPE nylon braided fuel line is NOT compatible with E85.

Q2: Can this fit diesel vehicles?
A2: No, the regulator is not compatible with diesel fuel.

Q3: How do I adjust the fuel pressure?
A3: Use the included allen key to turn the set screw on top of the regulator. The pre-installed spring supports 20-75psi; replace with the included spring for 75-120psi.

Q4: What's included in the package?
A4: Regulator, pressure gauge, replacement spring, AN10 port plug, allen key, sealant tape, AN6 fuel line, and all necessary fittings/clamps (see full list in Description).

Q5: Do I need professional installation?
A5: Professional installation is highly recommended for safety and optimal performance. Be sure to use the included sealant tape on the NPT gauge port for a leak-proof seal.

REVIEWS

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EVIL ENERGY EFI Fuel Pressure Regulator Kit Adjustable (20-120PSI) with 6AN CPE/PTFE Fuel Line Kit

EVIL ENERGY EFI Fuel Pressure Regulator Kit Adjustable (20-120PSI) with 6AN CPE/PTFE Fuel Line Kit

EVIL ENERGY EFI Fuel Pressure Regulator Kit Adjustable (20-120PSI) with 6AN CPE/PTFE Fuel Line Kit