JBtuned EG/EK Civic & DC Integra B-Series Complete Flex-Fuel System (Level 4)

Product Description

EG / EK Civic & DC Integra B-Series Complete Flex-Fuel System (Level 4)

The JBtuned B-Series Complete Flex-Fuel System is a complete tank-to-engine-and-back fuel-system replacement for compatible EG and EK Honda Civics and DC Acura Integras running a Honda B-Series engine.

This Level 4 configuration replaces the factory chassis fuel plumbing with JBtuned 350 Series PTFE feed-and-return lines and is specifically configured around the installation of a compatible ethanol-content sensor.

Choose either a 6AN or 8AN main fuel feed. The return remains 6AN with either configuration.

This is a Level 4 B-Series fuel system: “I want to replace everything.” The Flex-Fuel version adds dedicated ethanol-content-sensor integration to the complete-system architecture.

Complete Flex-Fuel System at a Glance

• Fitment: 1992-1995 Honda Civic EG, 1996-2000 Honda Civic EK and 1994-2001 Acura Integra DC
• Engine: Compatible Honda B-Series engines including B16, B18 and B20 combinations
• System Type: Complete tank-to-engine-and-back dedicated return-style fuel system
• Factory Chassis Fuel Lines: Replaced
• OEM Firewall Fuel Filter: Removed from the fuel-system layout
• Feed Line: 6AN or 8AN
• Return Line: 6AN
• Fuel Hose: JBtuned 350 Series PTFE
• Fuel Compatibility: Pump gasoline, E85 / ethanol and compatible race fuels
• Fuel Filter: Large-body inline filter included
• Fuel Rail: Compatible aftermarket B-Series fuel rail required
• Fuel Pressure Regulator: Compatible external adjustable regulator required
• Ethanol-Content Sensor Provision: Included in the fuel-system configuration
• Ethanol-Content Sensor: Not included with the base system
• Fuel Pump: Not included with the base system

What Comes With the Base System

• Complete JBtuned 350 Series PTFE fuel-feed plumbing from the fuel tank to the engine bay in the selected 6AN or 8AN size
• Complete JBtuned 350 Series PTFE 6AN return plumbing from the engine bay back to the fuel tank
• Large-body inline fuel filter
• Serviceable 6-micron stainless-steel filter element
• Fuel-rail connection components for the selected aftermarket B-Series fuel rail
• Fuel-pressure-regulator connection components for the selected regulator configuration
• Required AN connection hardware for the configured base fuel system
• Fuel-system plumbing configured for compatible ethanol-content-sensor installation

Exact line and connection configurations vary based on the chassis, feed-line size, fuel rail, regulator, fuel-pump hanger and options selected when ordering.

Required Parts Not Included

Aftermarket B-Series Fuel Rail: This configuration requires a compatible aftermarket B-Series fuel rail. Select the rail installed on the engine when ordering so JBtuned can configure the appropriate connections.

This system is not designed around the factory B-Series fuel rail and factory rail-mounted regulator arrangement. If your aftermarket fuel rail is not listed, contact JBtuned before ordering.

External Adjustable Fuel Pressure Regulator: A compatible external adjustable fuel pressure regulator is required to control fuel pressure and provide the return path back to the fuel tank. If you do not already have a regulator, shop JBtuned fuel pressure regulators for compatible options.

Fuel Pressure Regulator Mounting: The regulator mounts to the USDM driver-side shock tower. JBtuned offers a dedicated Fuel Pressure Regulator Mounting Bracket for EG / EK Civic and DC Integra that uses the upper control-arm mounting points for a clean, secure installation.

Ethanol-Content Sensor: The fuel-system plumbing is configured for sensor integration, but the ethanol-content sensor itself is not included with the base system.

Fuel Pump: Fuel-pump requirements depend on the engine combination, fuel being used, injector demand, operating pressure and expected fuel demand. A fuel pump is not included with the base system.

What This Level 4 Flex-Fuel Configuration Changes

Level 4 replaces the factory chassis feed and return plumbing with dedicated aftermarket fuel lines running from the fuel tank to the engine bay and back.

The original Honda firewall-mounted fuel-filter arrangement is also removed and replaced with a large-body inline fuel filter as part of the complete aftermarket system.

The Complete Flex-Fuel version uses the same full Level 4 architecture while also configuring the fuel plumbing around a compatible ethanol-content sensor.

The fuel-system Level describes the plumbing architecture, while the Flex-Fuel designation describes the sensor-ready configuration of this particular Level 4 system.

350 Series PTFE Hose - Pump Gas / E85 / Compatible Race Fuels

This system uses JBtuned 350 Series PTFE fuel hose for both the feed and return plumbing.

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 fuel plumbing provides broader fuel compatibility whether the vehicle is operated on gasoline, E85 or another compatible fuel.

E85 Compatibility and Flex-Fuel Sensor Integration Are Different

Fuel compatibility and ethanol-content-sensor integration are separate parts of the system.

JBtuned 350 Series PTFE hose makes the fuel plumbing suitable for pump gasoline, E85 and compatible race fuels.

The reason to choose this Complete Flex-Fuel System instead of the standard B-Series Full Tucked Fuel System is that this version is specifically configured around ethanol-content-sensor installation.

You do not need the Complete Flex-Fuel System simply because the vehicle will run E85. The standard Level 4 Full Tucked Fuel System can also support E85 when configured with JBtuned 350 Series PTFE hose.

An ethanol-content sensor can provide real-time fuel-composition information to a compatible ECU for a sensor-based flex-fuel strategy. Sensor wiring, ECU compatibility, configuration and tuning are separate from the fuel-system plumbing.

Not sure which configuration is appropriate? Read our guide to E85, PTFE fuel lines and flex-fuel systems.

Configured for an Ethanol-Content Sensor

The Complete Flex-Fuel System is laid out specifically to incorporate a compatible ethanol-content sensor into the fuel plumbing.

This allows customers planning a sensor-based flex-fuel setup to purchase the complete system already configured for sensor integration instead of modifying the standard complete fuel system later.

The ethanol-content sensor itself is not included with the base system.

Flex-Fuel Sensor Components

Ethanol-Content Sensor: JBtuned offers the Genuine Continental Flex-Fuel Sensor for compatible installations.

Quick-Disconnect Fittings: If you already have a compatible Continental-style sensor, JBtuned offers Flex-Fuel Sensor Quick-Disconnect Fittings separately. The standalone fitting is sold individually, and a typical sensor installation requires two fittings.

Sensor Mounting: The sensor should be securely supported instead of allowing the fuel lines to carry the weight of the sensor assembly. JBtuned offers a Flex-Fuel Sensor Mounting Bracket for compatible installations.

Sensor Wiring: The fuel system provides the plumbing configuration for sensor installation but does not automatically provide the electronics or ECU configuration needed to use the sensor signal.

For compatible Hondata S300 applications, JBtuned offers the JBtuned Flex-Fuel Sensor Plug-N-Play Harness.

Confirm sensor input requirements, wiring, ECU compatibility and tuning strategy for the engine-management system being used.

Large-Body Inline Fuel Filter

The B-Series Complete Flex-Fuel System includes a large-body inline fuel filter with a serviceable 6-micron stainless-steel element.

The filter replaces the original Honda firewall-mounted fuel-filter arrangement as part of the complete aftermarket fuel system.

6AN or 8AN Feed With 6AN Return

Choose either a 6AN or 8AN main fuel feed based on the requirements of the build.

• 6AN Feed / 6AN Return
• 8AN Feed / 6AN Return

The return remains 6AN with either feed configuration.

Fuel-pump capability, injector demand, fuel type, operating pressure and expected fuel demand should all be considered when selecting feed-line size.

Vehicle & Engine Fitment

• 1992-1995 Honda Civic EG with B-Series engine
• 1996-2000 Honda Civic EK with B-Series engine
• 1994-2001 Acura Integra DC / DC2 with B-Series engine
• B16 engine combinations
• B18 engine combinations
• B20 engine combinations
• LS/VTEC combinations
• B20/VTEC combinations
• Other compatible Honda B-Series engines

Final fitment depends on the chassis, aftermarket fuel rail, external fuel pressure regulator, fuel-pump hanger and other components installed on the vehicle.

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

Ordering Options

Vehicle / Chassis: Select the EG Civic, EK Civic or DC Integra receiving the complete B-Series fuel system.

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

Feed Line Size: Choose either a 6AN or 8AN main fuel feed. The return remains 6AN.

Fuel Pressure Regulator Connection: Select the connection required by the external adjustable fuel pressure regulator being used.

Fuel Pump Hanger Upgrade: Select the appropriate JBtuned hanger upgrade if the factory sending unit has not already been configured for the aftermarket feed-and-return system and fuel pump being used.

Under-Car Fuel Line Brackets: Add the JBtuned Fuel & Brake Line Holder Brackets for secure mounting of compatible aftermarket feed and return lines underneath the vehicle.

Fuel Pump Hanger & Fuel Pump

Replacing the factory chassis fuel plumbing requires appropriate aftermarket feed-and-return connections at the fuel tank.

If the factory sending unit has not already been configured for the aftermarket AN plumbing and fuel pump being used, see the JBtuned Civic / Integra OEM Fuel Pump Hanger Upgrade Kit.

The hanger configuration varies according to the fuel pump being used, so select the appropriate fuel-pump configuration when ordering.

Fuel-pump requirements depend on the B-Series engine combination, fuel being used, injector demand, operating pressure and expected fuel demand. Larger fuel lines do not by themselves increase fuel-pump output.

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 feed and 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.

These brackets are designed to organize compatible aftermarket fuel lines while allowing the factory brake hard lines to remain in place.

Select the bracket configuration that matches the feed and return sizes used by the system.

Standard Level 4 or Flex-Fuel Level 4?

Both B-Series complete systems replace the factory chassis fuel plumbing from the fuel tank to the engine and back.

B-Series Full Tucked Fuel System: Choose this when you want the complete Level 4 fuel-system architecture without dedicated ethanol-content-sensor integration. Select 250 Series for conventional pump gasoline or 350 Series PTFE for pump gasoline, E85 and compatible race fuels.

B-Series Complete Flex-Fuel System: Choose this version when you want the complete Level 4 architecture built with 350 Series PTFE and specifically configured around ethanol-content-sensor installation. You are here.

The difference is sensor integration, not whether the standard Level 4 system can carry E85.

View the B-Series Full Tucked Fuel System

JBtuned B-Series Fuel-System Levels

• Level 1 - “I Just Need the Feed Line”: Retains the OEM firewall filter, factory chassis plumbing and existing return-side system while replacing or upgrading the filter-to-rail fuel-feed line.
• Level 2 - “I Want Feed & Return”: Retains the OEM firewall filter and factory chassis lines while upgrading both the engine-bay feed and return plumbing.
• Level 3 - “I Want It Cleaner / Tucked”: Retains the factory chassis feed and return lines, removes the OEM firewall filter, adds a compact inline filter and upgrades the engine-bay feed and return plumbing.
• Level 4 - “I Want to Replace Everything”: Replaces the complete factory chassis feed and return plumbing from the fuel tank to the engine and back.
• Level 4 - Flex-Fuel Configuration: Uses the same complete Level 4 architecture with 350 Series PTFE hose and dedicated ethanol-content-sensor integration. You are here.

View Level 1  |  View Level 2  |  View Level 3  |  View Standard Level 4

Which B-Series Fuel System Should I Choose?

Choose Level 1 if you only want to replace or upgrade the filter-to-rail fuel-feed line while retaining the OEM firewall filter and existing chassis plumbing.

Choose Level 2 if you want to upgrade both the engine-bay feed and return plumbing while retaining the OEM firewall filter and factory chassis fuel lines.

Choose Level 3 if you want to remove the OEM firewall filter, add a compact inline filter and use a cleaner engine-bay feed-and-return layout while retaining the factory chassis fuel lines.

Choose the standard Level 4 Full Tucked Fuel System if you want to replace the complete factory chassis plumbing but do not specifically need the system configured around an ethanol-content sensor.

Choose the Level 4 Complete Flex-Fuel System if you want the complete tank-to-engine-and-back architecture, 350 Series PTFE plumbing and dedicated ethanol-content-sensor integration.

Installation Notes

• This system replaces the original chassis fuel plumbing from the fuel tank to the engine and back.
• Installation requires access to the fuel tank, fuel-pump hanger, underbody fuel-line routing, aftermarket fuel rail, external fuel pressure regulator and ethanol-content-sensor installation area.
• All fuel lines and fuel-system components must be securely supported and routed away from exhaust heat, sharp edges, moving components and areas where road debris or abrasion may cause damage.
• Turbocharged and other high-heat applications require additional attention to fuel-line clearance and thermal protection.
• After installation, pressurize the fuel system and carefully inspect every connection for leaks before starting or operating the vehicle.

Fuel-system changes, ethanol-content-sensor installation, fuel-pressure changes, injectors, fuel pumps, fuel changes and sensor-based flex-fuel strategies may require appropriate ECU configuration and tuning.

Professional installation and tuning are recommended where applicable.

For off-road use only.

Questions About Your B-Series Fuel System?

If you are unsure whether the standard B-Series Level 4 Full Tucked Fuel System or the Complete Flex-Fuel version is right for your build, contact JBtuned with your vehicle, year, B-Series engine, fuel rail, fuel pressure regulator, fuel pump, fuel being used and engine-management setup.