Product Description
EG / EK Civic & DC Integra J-Series Dual-Feed Complete Fuel System (Level 4)
The JBtuned Level 4 J-Series Dual-Feed Complete Fuel System replaces the factory chassis fuel plumbing on compatible EG and EK Honda Civics and DC Acura Integras running a Honda J-Series engine swap.
The system replaces the fuel plumbing from the tank to the engine and back with a complete JBtuned 350 Series PTFE feed-and-return system built around the dual-rail layout of a Honda J-Series engine.
The standard configuration uses an 8AN main chassis feed, dual 6AN fuel-rail feeds and a dedicated 6AN return.
This is Level 4 in the JBtuned J-Series fuel-system lineup: “I want to replace everything.”
Level 4 at a Glance
- Fitment: 1992-1995 Honda Civic EG, 1996-2000 Honda Civic EK and 1994-2001 Acura Integra DC with compatible J-Series engine swap
- System Type: Complete tank-to-engine-and-back dual-feed fuel system
- Factory Chassis Fuel Plumbing: Replaced
- Main Fuel Feed: 8AN
- Fuel-Rail Feeds: Dual 6AN
- Fuel Return: 6AN
- Fuel Hose: JBtuned 350 Series PTFE
- Fuel Compatibility: Pump gasoline, E85 / ethanol and compatible race fuels
- Fuel Rails: Compatible aftermarket J-Series dual fuel rails required
- Fuel Pressure Regulator: Compatible external adjustable regulator required
- Fuel Filter: Optional - not included with the base system unless selected
- Flex-Fuel Sensor Provision: Optional plumbing configuration
- Ethanol-Content Sensor: Not included
- Fuel Pump: Not included unless selected or purchased separately
What Comes With the Base Level 4 System
- Complete JBtuned 350 Series PTFE 8AN main fuel-feed plumbing from the fuel tank to the engine bay
- Dual JBtuned 350 Series PTFE 6AN fuel-rail feed assemblies
- Complete JBtuned 350 Series PTFE 6AN return plumbing from the engine bay back to the fuel tank
- Fuel-rail connection components for the selected configuration
- Fuel-pressure-regulator connection components for the selected configuration
- Required AN connection hardware for the configured base fuel system
Exact line and connection configurations vary according to the chassis, fuel rails, regulator, fuel filter, fuel-pump hanger, heat-protection and flex-fuel selections.
The base system does not include a fuel filter, aftermarket fuel rails, fuel pressure regulator, fuel pump or ethanol-content sensor unless specifically selected or purchased separately.
Required Parts Not Included
Aftermarket J-Series Fuel Rails: The Level 4 system requires compatible aftermarket J-Series dual fuel rails. The standard system is not designed to connect to the factory OEM J-Series fuel rails.
Compatible aftermarket rails can be supplied with the system when selected, or the system can be configured around compatible aftermarket rails you already own.
External Fuel Pressure Regulator: A compatible external adjustable fuel pressure regulator is required to control fuel pressure and provide the regulated return path back to the tank.
Different regulators use different connection configurations, so select the regulator connection appropriate for your setup when ordering.
If you need a regulator, JBtuned offers the AEM Adjustable Fuel Pressure Regulator.
Fuel Pump: Fuel-pump requirements depend on the J-Series engine combination, fuel being used, injector demand, operating pressure and expected fuel demand. A fuel pump is not included with the base system.
What Level 4 Changes
Level 4 replaces the factory chassis fuel plumbing with dedicated aftermarket feed-and-return lines running from the fuel tank to the engine bay and back.
For the J-Series system, the main 8AN chassis feed transitions into dual 6AN feeds so each compatible aftermarket fuel rail receives its own dedicated fuel supply.
Fuel leaving the rail system is controlled by the external fuel pressure regulator and returned to the tank through the dedicated 6AN return.
This provides a complete aftermarket fuel-system architecture without relying on the original chassis fuel plumbing.
Dual-Feed J-Series Fuel-Rail Layout
A Honda J-Series engine uses two fuel rails, so the JBtuned Level 4 system is configured to supply both rails directly.
- 8AN Main Chassis Feed
- Dual 6AN Fuel-Rail Feeds
- External Adjustable Fuel Pressure Regulator
- 6AN Return to the Fuel Tank
The dual-feed configuration supplies each compatible aftermarket fuel rail directly rather than relying on one rail to supply the other.
JBtuned configures the complete fuel-line system around this architecture so the customer does not have to determine the individual hose, adapter and connection requirements for the dual-rail setup.
350 Series PTFE - Pump Gas / E85 / Compatible Race Fuels
The J-Series Level 4 system uses JBtuned 350 Series PTFE fuel hose throughout the complete feed-and-return system.
350 Series PTFE is appropriate for:
- Conventional pump gasoline
- E85 and ethanol-based fuels
- Compatible race fuels
- Gasoline builds that may move to ethanol-based fuel later
Choosing this system does not mean the vehicle has to run E85.
The PTFE plumbing provides broader long-term fuel compatibility whether the vehicle runs conventional pump gasoline, E85 or another compatible fuel.
E85 Compatibility Is Not the Same as Flex-Fuel Sensor Integration
JBtuned 350 Series PTFE makes the fuel plumbing suitable for pump gasoline, E85 and compatible race fuels.
That does not by itself make the vehicle a sensor-based flex-fuel system.
An ethanol-content sensor can provide real-time fuel-composition information to a compatible ECU for a sensor-based flex-fuel strategy. Sensor wiring, engine-management compatibility, ECU configuration and tuning are separate from the fuel-system plumbing.
If you want the fuel-system plumbing prepared for a compatible ethanol-content sensor, select the Flex-Fuel Sensor Provision when ordering.
Do not select the sensor provision simply because the vehicle will run E85. The Level 4 350 Series PTFE fuel system is already compatible with E85. The sensor provision is specifically for ethanol-content-sensor integration.
Not sure which configuration is appropriate? Read our guide to E85, PTFE fuel lines and flex-fuel systems.
Aftermarket J-Series Fuel Rails Required
The J-Series Level 4 system requires compatible aftermarket dual fuel rails.
The standard configuration is not designed to connect to the factory OEM J-Series fuel rails.
Compatible aftermarket rails can be included with the system when selected, or the system can be configured around compatible rails you already own.
If you already have aftermarket J-Series fuel rails and are unsure whether they are compatible, contact JBtuned before ordering.
External Fuel Pressure Regulator Required
The dual-feed return-style system requires a compatible external adjustable fuel pressure regulator.
The regulator controls fuel pressure and provides the regulated return path back to the fuel tank through the dedicated 6AN return line.
Select the appropriate regulator connection when ordering so JBtuned can configure the system for the regulator installed on the vehicle.
If you are unsure whether your regulator configuration is compatible, contact JBtuned before ordering.
Optional High-Flow Fuel Filter
A fuel filter is available as an option but is not included with the base J-Series Level 4 system unless selected.
Select the appropriate Fuel Filter option when ordering if you want JBtuned to configure the complete system with a compatible high-flow inline filter.
The filter must be securely mounted in an appropriate location and incorporated into the fuel-system layout during installation.
Optional Flex-Fuel Sensor Provision
The Flex-Fuel Sensor Provision configures the fuel-system plumbing around the installation of a compatible ethanol-content sensor.
This option prepares the plumbing for sensor installation. It does not include the sensor, wiring, ECU input, controller or tuning required to use the sensor signal.
JBtuned offers the Genuine Continental Flex-Fuel Sensor for compatible installations.
Compatible Flex-Fuel Sensor Quick-Disconnect Fittings are also available separately.
Flex-Fuel Sensor Mounting
An ethanol-content sensor should be securely supported rather than allowing the fuel plumbing to carry the weight of the sensor assembly.
For compatible installations, JBtuned offers the JBtuned Flex-Fuel Sensor Mounting Bracket.
High-Heat Sleeve Option
J-Series swaps can place fuel-system components near exhaust manifolds, turbochargers, wastegates, downpipes and other high-temperature components.
The optional High Heat Sleeve provides additional thermal protection for applicable fuel-hose sections during assembly.
The sleeve provides an additional layer of protection but does not replace proper fuel-line routing or adequate clearance from extreme heat sources.
Every J-Series swap is different, so the installer must verify appropriate clearance and thermal protection for the specific vehicle.
Fuel Pump Hanger & Fuel Pump
A complete Level 4 feed-and-return system requires appropriate aftermarket fuel connections at the tank.
If the factory sending unit has not already been configured for the new AN fuel system, see the JBtuned Civic / Integra OEM Fuel Pump Hanger Upgrade Kit.
The appropriate hanger configuration depends on the chassis, fuel pump and complete fuel-system setup.
Fuel-pump requirements depend on the J-Series engine combination, fuel being used, injector demand, operating pressure and expected fuel demand.
If you need a fuel pump, shop JBtuned fuel pumps.
Under-Car Fuel-Line Support
Because Level 4 replaces the factory chassis fuel plumbing, the new 8AN feed and 6AN return lines must be securely supported underneath the vehicle.
For compatible EG, EK and DC chassis, JBtuned offers JBtuned EG EK Civic / DC Integra Fuel & Brake Line Holder Brackets.
The brackets are available for the 8AN feed / 6AN return configuration used by this J-Series system and provide a clean way to support the aftermarket fuel lines while retaining the factory brake hard lines.
The brackets are designed for aftermarket fuel lines and do not retain the factory OEM fuel lines.
The EG/EK/DC bracket system also has no position for the factory EVAP line. The EVAP line must be removed or reconfigured as appropriate for the vehicle and installation.
Vehicle & Engine Fitment
- 1992-1995 Honda Civic EG with compatible J-Series engine swap
- 1996-2000 Honda Civic EK with compatible J-Series engine swap
- 1994-2001 Acura Integra DC with compatible J-Series engine swap
- Compatible Honda and Acura J-Series engine combinations
Final fitment depends on the J-Series engine, intake manifold, aftermarket fuel rails, fuel pressure regulator, engine mounts, turbo or exhaust system and other surrounding components installed on the vehicle.
If your combination is unusual or your components are not represented in the available ordering options, contact JBtuned before ordering.
Ordering Options
Vehicle / Chassis: Select the EG Civic, EK Civic or DC Integra receiving the J-Series Level 4 fuel system.
Fuel Rails: Select whether compatible aftermarket J-Series dual fuel rails should be supplied with the system. The standard Level 4 system is not designed around the factory OEM J-Series fuel rails.
Fuel Filter: Select the appropriate option if you want the complete system configured with a compatible high-flow inline fuel filter. The base system does not include a filter unless selected.
High Heat Sleeve: Add additional thermal protection when the fuel plumbing will operate near exhaust manifolds, turbochargers, wastegates, downpipes or other significant heat sources.
Flex-Fuel Sensor Provision: Select this option if you want the plumbing configured around a compatible ethanol-content sensor. The sensor itself is not included.
Fuel Pump Hanger Upgrade: Select the appropriate hanger configuration if the factory sending unit has not already been prepared for the complete aftermarket feed-and-return system.
Fuel Pressure Regulator Connection: Select the connection configuration used by the external adjustable fuel pressure regulator installed on the vehicle.
Under-Car Fuel Line Brackets: Add the JBtuned Fuel & Brake Line Holder Brackets for secure mounting of the 8AN feed and 6AN return underneath compatible EG, EK and DC chassis.
Need the Simpler J-Series Fuel Setup?
Not every J-Series swap needs a complete Level 4 dual-feed aftermarket fuel system.
If your build will retain the OEM firewall-mounted fuel filter, factory chassis fuel supply and factory J-Series rail/regulator arrangement, start with the JBtuned J-Series Level 1 OEM Filter-to-Rail Fuel Line.
Level 1 provides the engine-bay feed connection needed for a simpler J-Series swap without replacing the complete chassis fuel system.
JBtuned J-Series Fuel-System Levels
- Level 1 - “I Just Need the Feed Line”: Retains the OEM firewall filter, factory chassis fuel supply and factory J-Series fuel rail/regulator arrangement while replacing or upgrading the engine-bay fuel-feed connection.
- Level 4 - “I Want to Replace Everything”: Replaces the complete chassis fuel plumbing with a JBtuned 350 Series PTFE dual-feed system using an 8AN main feed, dual 6AN fuel-rail feeds, external fuel pressure regulation and a dedicated 6AN return. You are here.
View the JBtuned J-Series Level 1 Fuel Line
Which J-Series Fuel System Should I Choose?
Choose Level 1 if you want a simple engine-bay feed-line solution while retaining the OEM firewall filter, factory chassis fuel supply and factory J-Series fuel rail/regulator arrangement.
Choose Level 4 if you want to replace the factory chassis fuel plumbing and use a complete aftermarket dual-feed J-Series fuel system from the tank to both fuel rails and back.
Installation Notes
- The Level 4 system replaces the original chassis fuel plumbing with a complete aftermarket feed-and-return system.
- Installation requires access to the fuel tank, underbody fuel-line routing, engine-bay fuel-system components, dual fuel rails, external regulator and fuel-pump hanger connections.
- All fuel lines must be securely mounted and routed away from exhaust heat, sharp edges, moving components and areas where road debris or abrasion may damage the hose.
- Turbocharged and other high-heat installations require additional attention to fuel-line clearance and thermal protection.
- Verify that both fuel rails, the external regulator and all line assemblies are securely mounted before operating the vehicle.
- 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, fuel type, ethanol-content-sensor integration or other engine-system components may require appropriate ECU configuration and tuning.
Professional installation and tuning are recommended where applicable.
For off-road use only.
Questions About Your J-Series Fuel System?
If you are unsure whether Level 1 or the Level 4 Dual-Feed Complete Fuel System is appropriate for your build, contact JBtuned with your vehicle, year, J-Series engine, fuel rails, fuel pressure regulator, fuel pump, fuel being used, turbo or exhaust configuration and approximate power goals.
