JBtuned EF Civic / CRX / DA Integra K-Swap Fuel Tuck Kit – K20/K24 (Level 3)

Product Description

EF Civic / CRX / DA Integra K-Swap Fuel Tuck Kit - K20/K24 (Level 3)

The JBtuned Level 3 K-Swap Fuel Tuck Kit upgrades the engine-bay fuel system on compatible EF Civic, CRX and DA Integra chassis running a K20 or K24 engine swap.

The system converts the K-Series engine bay to a dedicated return-style fuel configuration, removes the factory firewall-mounted fuel filter, adds a compact inline filter and replaces the engine-bay feed and return plumbing with 6AN fuel lines while retaining the vehicle's original chassis feed and return hard lines.

This is Level 3 in the JBtuned K-Swap fuel-system lineup: “I want it cleaner / tucked.”

Level 3 at a Glance

• Fitment: 1988-1991 Honda Civic EF, 1988-1991 Honda CRX and 1989-1993 Acura Integra DA
• Engine: K20 / K24 K-Series swaps
• System Type: Return-style tucked engine-bay fuel system
• OEM Firewall Fuel Filter: Removed
• Fuel Filter: Compact inline filter included
• Factory Chassis Feed: Retained
• Factory Chassis Return: Retained
• Engine-Bay Feed: 6AN
• Engine-Bay Return: 6AN
• Fuel Hose: JBtuned 250 Series rubber-core braided hose
• Fuel Compatibility: Conventional pump gasoline
• Fuel Rail: Compatible aftermarket K-Series fuel rail required
• Fuel Pressure Regulator: Compatible external adjustable regulator required
• Chassis Connection: Modification of the existing chassis fuel-line connection points required

What Comes With the Level 3 Kit

• Configured 6AN engine-bay fuel-feed assembly
• Configured 6AN engine-bay fuel-return assembly
• Compact inline fuel filter
• Required chassis connection components
• Fuel-rail connection components for the selected configuration
• Fuel-pressure-regulator connection components for the configured system
• Required connection hardware for the configured fuel system

Exact connection components vary depending on the chassis, fuel rail and fuel-pressure-regulator configuration selected.

A compatible aftermarket K-Series fuel rail and external adjustable fuel pressure regulator are required.

The fuel rail and fuel pressure regulator are not included unless specifically selected or purchased separately.

What Level 3 Changes

Level 3 replaces the engine-bay portion of the fuel system while retaining the original chassis feed and return hard lines underneath the vehicle.

The factory firewall-mounted fuel filter is removed and replaced with a compact inline filter incorporated into the new 6AN feed plumbing.

A dedicated 6AN engine-bay return is added between the external fuel pressure regulator and the vehicle's original chassis return line.

This creates a cleaner return-style K-Swap engine-bay layout without requiring complete replacement of the chassis fuel plumbing.

Return-Style K-Swap Fuel System

The Level 3 kit converts the engine-side K-Series fuel system to a dedicated return-style configuration.

Fuel is supplied through the retained factory chassis feed into the JBtuned engine-bay plumbing and compatible aftermarket K-Series fuel rail.

An external adjustable fuel pressure regulator controls fuel pressure and sends the regulated fuel return through the 6AN engine-bay return plumbing to the vehicle's original chassis return line.

JBtuned configures the feed, return and connection components around the selected chassis, fuel rail and regulator setup so the customer does not have to determine the individual fittings and adapters required to assemble the engine-bay system.

Compact Inline Fuel Filter

The large factory firewall-mounted Honda fuel filter is removed from the fuel-system layout.

In its place, the Level 3 system uses a compact inline fuel filter incorporated into the new engine-bay feed plumbing.

This frees up space around the firewall and provides more flexibility for routing the fuel system around the components used in a K-swapped EF Civic, CRX or DA Integra.

Factory Chassis Fuel Lines Remain

Level 3 retains the vehicle's original chassis feed and return hard lines rather than replacing the complete fuel system underneath the car.

Because EF Civic, CRX and DA Integra chassis are now several decades old, inspect the original fuel lines carefully before installation.

Factory hard lines showing significant corrosion, physical damage, deterioration or leakage should be replaced rather than reused.

Modification of the existing chassis fuel-line connection points is required during installation.

Aftermarket K-Series Fuel Rail Required

The Level 3 kit is designed for use with a compatible aftermarket K-Series fuel rail.

The original OEM K-Series fuel-rail configuration is not supported by this kit.

Select the aftermarket fuel rail installed on the engine when ordering so JBtuned can configure the appropriate rail-side connection.

Different aftermarket rails use different port and connection configurations. If your fuel rail is not represented in the available options, contact JBtuned before ordering.

External Fuel Pressure Regulator Required

A compatible external adjustable fuel pressure regulator is required for the Level 3 return-style fuel system.

The regulator controls fuel pressure and provides the regulated return path back to the vehicle's factory chassis return line.

If you need a regulator, JBtuned offers the AEM 25-302BK Universal Adjustable Fuel Pressure Regulator.

The fuel pressure regulator shown in product photos may be an installation example and is not included with the base kit unless specifically selected.

Final regulator placement depends on the fuel rail, intake manifold, engine mounts, accessory configuration, header, turbo system and other components installed on the vehicle.

250 Series - Pump Gasoline

The EF / CRX / DA K-Swap Level 3 system uses JBtuned 250 Series rubber-core braided fuel hose.

JBtuned 250 Series hose is intended for conventional pump gasoline.

250 Series hose is not intended for continuous or full-time E85 use.

If the vehicle is being built for E85, ethanol-based fuels or another application requiring broader fuel compatibility, use an appropriate JBtuned fuel system configured with 350 Series PTFE hose.

Fuel compatibility should be considered across the complete fuel system, including hose, filter, regulator, fuel pump, seals and other fuel-contact components.

K-Swap Routing & Accessory Considerations

EF Civic, CRX and DA Integra K-swaps can vary significantly depending on the engine, mount kit, intake manifold, accessory configuration and surrounding components.

Some product photos may show a compatible aftermarket idle-pulley arrangement that provides additional clearance for a more tucked fuel-line routing near the engine mount.

The idle pulley and related accessory components shown in installation photos are not included with this kit.

An aftermarket idle-pulley configuration is not required for every installation. Vehicles using different accessory arrangements may require a different fuel-line routing path based on the available clearance.

Always verify adequate clearance from engine mounts, belts, pulleys, exhaust components, sharp edges, moving components and high-temperature areas before finalizing the fuel-line routing.

Vehicle & Engine Fitment

• 1988-1991 Honda Civic EF with compatible K-Series engine swap
• 1988-1991 Honda CRX with compatible K-Series engine swap
• 1989-1993 Acura Integra DA with compatible K-Series engine swap
• K20 engine swaps
• K24 engine swaps

Final fitment and routing depend on the K-Series engine, intake manifold, fuel rail, fuel pressure regulator, engine mounts, accessory configuration, exhaust or turbo system and other surrounding components installed on the vehicle.

If your combination is unusual or your components are not represented in the available options, contact JBtuned before ordering.

JBtuned K-Swap Fuel-System Levels

• Level 1 - “I Just Need the Feed Line”: Retains the OEM firewall fuel filter and factory chassis fuel plumbing while upgrading the engine-bay fuel-feed connection.
• Level 2 - “I Want Feed & Return”: Retains the OEM firewall fuel filter and factory chassis plumbing while converting the engine bay to dedicated feed-and-return plumbing.
• Level 3 - “I Want It Cleaner / Tucked”: Removes the OEM firewall fuel filter, adds a compact inline filter and uses dedicated engine-bay feed-and-return plumbing while retaining the factory chassis feed and return lines. You are here.
• Level 4 - “I Want to Replace Everything”: Uses complete aftermarket fuel plumbing from the fuel tank to the engine and back rather than relying on the factory chassis fuel lines.

The JBtuned fuel-system levels describe the architecture of the finished fuel system rather than representing horsepower ratings.

Which K-Swap Fuel System Should I Choose?

Choose Level 1 when you only need the engine-bay fuel-feed connection and want to retain the OEM firewall filter and existing chassis fuel system.

Choose Level 2 when you want dedicated engine-bay feed and return plumbing while retaining the OEM firewall filter and factory chassis fuel lines.

Choose Level 3 when you want the dedicated return-style engine-bay system plus a cleaner tucked layout that removes the OEM firewall filter and replaces it with a compact inline filter.

Choose Level 4 when the goal is to eliminate reliance on the factory chassis fuel plumbing and use a complete aftermarket tank-to-engine-and-back fuel system.

Ordering Options

Vehicle / Chassis: Select the EF Civic, CRX or DA Integra receiving the K-Swap Fuel Tuck Kit.

Fuel Rail: Select the compatible aftermarket K-Series fuel rail installed on the engine. Different rails require different connection configurations.

Fuel Pressure Regulator: Select the regulator configuration being used with the system or add a compatible regulator if needed.

Installation Notes

• Installation requires removal of the factory firewall-mounted fuel filter.
• The original chassis feed and return hard lines remain in service.
• Modification of the existing chassis fuel-line connection points is required.
• Inspect all factory chassis fuel plumbing carefully before reuse.
• Fuel lines showing significant corrosion, damage, deterioration or leakage should be replaced.
• Verify clearance from exhaust components, belts, pulleys, engine mounts, sharp edges, moving components and other potential sources of heat or abrasion.
• Turbocharged and other high-heat applications may require additional thermal protection depending on the final routing.
• After installation, pressurize the fuel system and carefully inspect every connection for leaks before starting or operating the vehicle.

Changes to fuel pressure, injectors, fuel pump or other engine-management components may require appropriate ECU configuration and tuning.

Professional installation is recommended if you are unfamiliar with K-Series engine swaps, AN fuel plumbing or chassis fuel-line modification.

For off-road use only.

Questions About Your EF / CRX / DA K-Swap?

If you are unsure whether this Level 3 kit matches your build, contact JBtuned with your vehicle, year, K-Series engine, engine-mount setup, accessory configuration, fuel rail, fuel pressure regulator, fuel being used and future fuel-system goals.