Product Description
K-Swap Fuel Tuck Kit – K20 / K24
The JBtuned K-Swap Fuel Tuck Kit is a cleaner engine-bay evolution of a return-style K-Series fuel system for compatible EG and EK Honda Civics and DC Acura Integras running a K20 or K24 engine swap.
This is Level 3 in the JBtuned K-Swap fuel-system lineup: “I want it cleaner / tucked.”
Like Level 2, Level 3 converts the K-Series engine side to a dedicated feed-and-return fuel system using an aftermarket K-Series fuel rail and external adjustable fuel pressure regulator.
The major difference is that Level 3 removes the large OEM firewall-mounted fuel filter and replaces it with a compact inline filter, allowing the engine-bay fuel plumbing to be arranged in a cleaner, less visually intrusive layout.
Level 3 still retains the vehicle's factory chassis feed and return hard lines, so you can clean up the engine bay without replacing the complete under-car fuel system.
Vehicle & Engine Fitment
- 1992-1995 Honda Civic EG
- 1996-2000 Honda Civic EK
- 1994-2001 Acura Integra DC
- K20 engine swaps
- K24 engine swaps
A compatible aftermarket K-Series fuel rail and external adjustable fuel pressure regulator are required.
Select the fuel rail installed on your engine when ordering so JBtuned can configure the appropriate rail connection.
Level 3 – Cleaner Return-Style K-Swap Fuel System
Factory K-Series applications use a returnless engine-side fuel-system arrangement.
Like Level 2, the JBtuned Level 3 system converts the K-Series engine side to a return-style fuel system using a dedicated feed, external fuel pressure regulator, and return line.
The earlier EG, EK, and DC chassis already have separate factory feed and return hard lines, allowing Level 3 to retain those chassis lines while replacing and reorganizing the engine-bay portion of the fuel system.
The result is a return-style K-swap fuel system with a cleaner engine bay and a more compact fuel-filter arrangement.
Removes the OEM Firewall Fuel Filter
The biggest visual and functional difference between Level 2 and Level 3 is the fuel filter.
Level 2 retains the large factory firewall-mounted Honda fuel filter.
Level 3 removes the OEM firewall fuel filter and replaces it with a compact inline filter as part of the JBtuned engine-bay fuel system.
Removing the OEM filter creates more freedom to organize the fuel plumbing and helps produce the cleaner tucked-style engine bay this kit is designed for.
Compact Inline Fuel Filter
Level 3 includes a compact e85Freaks inline mini fuel filter.
- Compact inline design
- Replaceable 30-micron bronze filter element
- Viton seals
- Designed for use with AN-style performance fuel systems
The compact filter replaces the bulky OEM firewall-mounted filter while remaining serviceable through its replaceable filter element.
Uses the Factory Chassis Feed & Return Lines
Level 3 cleans up the engine bay without requiring you to replace the complete chassis fuel system.
The vehicle's existing factory feed and return hard lines remain in use.
The JBtuned engine-bay plumbing transitions from those existing chassis lines into the new feed-and-return fuel-system arrangement.
This makes Level 3 a good choice for customers who want a cleaner return-style K-swap setup but do not yet need complete aftermarket fuel lines from the tank forward.
250 Series Rubber Hose – Pump Gasoline
The Level 3 K-Swap Fuel Tuck Kit uses JBtuned 250 Series rubber-core fuel hose.
The 250 Series hose is intended for conventional pump gasoline.
While occasional exposure to E85 may occur in some applications, the 250 Series hose is not intended for continuous or full-time E85 use.
If your build is intended for continuous E85, ethanol-based race fuels, or requires broader long-term fuel compatibility, move to the JBtuned Level 4 Complete K-Swap Fuel System with the appropriate 350 Series PTFE configuration.
Aftermarket K-Series Fuel Rail Required
A compatible aftermarket K-Series fuel rail is required for Level 3.
The aftermarket rail provides the connections needed for the dedicated feed-and-return arrangement used with the external fuel pressure regulator.
Different K20 and K24 fuel rails use different connection configurations, so select the fuel rail installed on your engine when ordering.
JBtuned configures the system around the selected rail so you do not have to determine the required engine-bay connections individually.
If your fuel rail is not listed, contact JBtuned before ordering.
External Fuel Pressure Regulator Required
Level 3 requires a compatible external adjustable fuel pressure regulator.
The regulator controls fuel pressure and provides the return path from the engine back into the vehicle's chassis return line.
This external-regulator arrangement is a fundamental part of the return-style K-Series fuel system used by Levels 2 and 3.
If you already have a regulator, verify that it is appropriate for a return-style fuel system before ordering.
Fuel Pressure Regulator Mounting
The external fuel pressure regulator should be securely mounted in the engine bay while keeping the surrounding fuel plumbing organized and away from excessive exhaust heat.
If a compatible JBtuned fuel pressure regulator mounting bracket is available for your chassis and regulator configuration, it can be added when ordering.
Cleaner Tucked Engine-Bay Layout
A fuel tuck system does not mean that every fuel hose disappears from view.
The goal of Level 3 is to reduce unnecessary visual clutter and create a cleaner fuel-system layout by eliminating the large OEM firewall filter and arranging the engine-bay plumbing around a more compact inline filter.
The system is also designed with exhaust heat in mind. Fuel plumbing must still be routed and secured appropriately for the specific engine, header, turbo system, and engine-bay configuration being used.
What Comes With the Kit
- Pre-assembled 250 Series engine-bay fuel-line assemblies
- Compact inline mini fuel filter
- Chassis-line connection components
- Fuel-rail connection components for the selected aftermarket rail
- Required connection hardware for the configured fuel-line system
Exact line and connection configurations vary depending on vehicle, fuel rail, and regulator setup.
Aftermarket fuel rail is required and is not included.
Fuel pressure regulator is not included unless selected.
Want to Extend Level 3 All the Way to the Fuel Tank Later?
Level 3 normally retains the vehicle's original chassis feed and return hard lines.
If your build later needs aftermarket chassis fuel plumbing, you do not have to discard the Level 3 engine-bay system.
Add the JBtuned Fuel Line Extension Kit .
The Extension Kit picks up where the Level 3 fuel system stops and continues the feed and return plumbing all the way back to the fuel tank.
This allows you to replace the remaining factory chassis fuel lines while continuing to use the Level 3 engine-bay portion you already purchased.
Upgrade the Feed & Return Together
If the Level 3 system eventually outgrows the factory chassis fuel lines, the correct upgrade path is to replace the feed and return together.
The JBtuned Fuel Line Extension Kit is designed specifically for that purpose.
The standalone tank-to-OEM-filter feed upgrade used with Level 1 does not apply to Level 3 because Level 3 eliminates the OEM firewall-mounted fuel filter and uses a dedicated return-style fuel system.
Fuel Pump Hanger Requirements When Adding the Extension Kit
Extending Level 3 all the way to the fuel tank requires a suitable fuel-pump hanger connection.
The Extension Kit is intended for use with a compatible modified fuel-pump hanger rather than an untouched factory hanger.
If your vehicle still uses an unmodified OEM hanger, consider the JBtuned Civic / Integra OEM Fuel Pump Hanger Upgrade Kit .
Under-Car Fuel-Line Mounting
If Level 3 is later expanded with aftermarket chassis feed and return lines, those lines should be securely supported underneath the vehicle.
For compatible EG, EK, and DC applications, JBtuned offers JBtuned EG EK Civic / DC Integra Fuel & Brake Line Holder Brackets for a clean underbody installation.
These brackets are designed for JBtuned and compatible aftermarket fuel lines rather than the original OEM fuel lines.
JBtuned K-Swap Fuel-System Progression
Not every K-swapped Civic or Integra needs the same fuel system.
JBtuned offers several levels so you can choose the fuel-system architecture that matches your current build while keeping a clear upgrade path for the future.
Level 1 – “I Just Need It Running”
Need only a simple returnless-style pump-gas connection from the OEM firewall filter to an aftermarket K-Series fuel rail?
Start with the JBtuned K-Swap OEM Filter-to-Rail Fuel Line .
Level 1 retains the simpler returnless-style engine-side arrangement and uses JBtuned 250 Series hose for conventional pump gasoline.
Level 2 – “I Want Feed & Return”
Want a dedicated return-style system but prefer to keep the OEM firewall-mounted fuel filter?
Step down to the JBtuned K-Swap OEM Filter Feed & Return Fuel Line Kit .
Level 2 converts the K-Series engine side to return-style while retaining the OEM firewall filter and both original chassis hard lines.
Level 3 – “I Want It Cleaner / Tucked”
You are here.
Level 3 uses the return-style architecture of Level 2 but removes the OEM firewall-mounted fuel filter and replaces it with a compact inline filter for a cleaner tucked-style engine-bay layout.
The factory chassis feed and return hard lines remain in use.
If those chassis lines later become a limitation, Level 3 can be expanded with the JBtuned Fuel Line Extension Kit.
Level 4 – “I Want Serious Fuel Capacity / E85”
If you already know the vehicle needs complete chassis fuel-system replacement, larger feed-line options, or a system intended for continuous E85 and broader fuel compatibility, move to the JBtuned EG/EK Civic & DC Integra K-Swap Complete Fuel System .
Level 4 replaces the factory chassis fuel plumbing from the tank to the engine and back and offers larger feed-size and 350 Series PTFE configurations for more demanding applications.
Quick Guide: Which K-Swap Fuel Kit Do I Need?
- Level 1 – “I just need it running.” Returnless-style pump-gas setup. Keep the OEM filter and use a simple feed line to the aftermarket K-Series rail.
- Level 2 – “I want feed & return.” Convert the K-Series to return-style using both OEM chassis hard lines while retaining the OEM firewall filter.
- Level 3 – “I want it cleaner/tucked.” Return-style system using the factory chassis hard lines, but remove the OEM firewall filter and replace it with a compact inline filter. Upgradeable later with the Fuel Line Extension Kit.
- Level 4 – “I want serious fuel capacity/E85.” Replace the complete chassis fuel plumbing and move to larger-feed and 350 Series PTFE options.
Level 3 Gives You Room to Grow
Choosing Level 3 does not mean you need to replace the entire chassis fuel system today.
You can retain the original Honda feed and return hard lines while cleaning up the engine bay, then later add the JBtuned Fuel Line Extension Kit if the fuel-system requirements increase.
The Level 3 engine-bay portion remains in place while the Extension Kit replaces the remaining feed and return plumbing back to the fuel tank.
If you already know from the beginning that the build requires larger feed plumbing, substantially greater fuel capacity, or continuous E85 capability, Level 4 may be the more appropriate starting point.
Fuel Compatibility & Future Upgrades
Level 3 uses JBtuned 250 Series hose and is intended primarily for conventional pump gasoline.
If your long-term goal includes full-time E85, ethanol-based race fuels, significantly increased fuel demand, or complete replacement of the original chassis fuel plumbing, consider the Level 4 Complete K-Swap Fuel System with the appropriate 350 Series PTFE option.
Not sure which option you need? Read our guide to E85, PTFE fuel lines, and flex-fuel systems.
Ordering Options Explained
Vehicle / Chassis
Select the Civic or Integra chassis receiving the K-Series swap so JBtuned can provide the appropriate configuration.
Fuel Rail
Select the aftermarket K-Series fuel rail installed on the engine.
Different rails require different connection configurations.
Fuel Pressure Regulator
Select this option if you need a compatible external adjustable fuel pressure regulator supplied with the system.
Fuel Pressure Regulator Mounting Bracket
Select this option if you want to add the compatible JBtuned regulator mounting bracket to the fuel-line package.
Installation Information
Level 3 removes the OEM firewall-mounted fuel filter and converts the engine-bay fuel plumbing to a compact return-style arrangement while retaining the factory chassis feed and return hard lines.
Installation requires modification of the existing chassis fuel-line connection points so the new AN-style engine-bay plumbing can be installed.
All fuel lines and components must be securely mounted and kept away from exhaust components, sharp edges, moving parts, and areas where excessive heat or abrasion may damage the system.
Turbocharged applications and other high-heat engine bays require particular attention to fuel-line routing and heat protection.
After installation, pressurize the fuel system and carefully inspect every connection for leaks before starting or operating the vehicle.
Professional installation is recommended if you are unfamiliar with automotive fuel plumbing, hard-line modification, adjustable fuel pressure regulators, or K-Series engine swaps.
For off-road use only.
Questions About Which K-Swap Fuel-System Level You Need?
If you are unsure which JBtuned K-Swap fuel system is right for your build, contact us with your vehicle, year, K20/K24 engine, fuel rail, regulator, fuel being used, and approximate power goals.
