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Complete Fuel Delivery Rebuild for the Mitsubishi Lancer Evolution 4G63
The Radium Engineering RAD20-1334-03 EVO 1-6 Fuel Hanger Plumbing Kit with Stainless Filter gives your Mitsubishi Lancer Evolution a purpose-built fuel system backbone that goes far beyond what the factory ever intended. Designed specifically for EVO 1 through EVO 6 chassis running the iconic 4G63 turbocharged inline-four, this RAD20-1334-03 kit bundles a stainless steel filtration element, a precision fuel pressure regulator, a live-read fuel pressure gauge, and every hose, fitting, and bracket needed to complete the install. Whether you are chasing E85 compatibility, methanol injection, or simply need a clean high-flow foundation for a built motor, this kit delivers a verified solution in a single box.
Key Features
- Stainless steel filter element (the "-03" designation) rated for gasoline, E85, and methanol without degradation
- Billet aluminum Radium fuel pressure regulator with integrated FPR for consistent rail pressure across the RPM range
- Liquid-filled fuel pressure gauge included for real-time monitoring without an additional sender
- EVO 1-6 specific billet filter mounting bracket ensures a factory-clean install with no fabrication
- Two-piece billet filter clamp eliminates vibration wear on the filter housing
- 8AN PTFE fuel feed hose and 6AN PTFE return hose included, pre-cut and fitted for the EVO 1-6 layout
- SAE quick-disconnect fittings and aluminum adapter fittings included
- Stainless steel and aluminum hardware throughout for corrosion resistance in harsh engine bay conditions
- Compatible with Walbro GSS342, F90000267, F90000274, F90000285, AEM 50-1220, Fuelab 49614, DeatschWerks DW400, DW440, and DW810 fuel pumps
- Designed for use alongside the Radium 4G63 fuel rail (sold separately)
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 1992-1993 | Mitsubishi | Lancer Evolution | EVO 1 (GSR, RS) |
| 1994-1995 | Mitsubishi | Lancer Evolution | EVO 2 (GSR, RS) |
| 1995 | Mitsubishi | Lancer Evolution | EVO 3 (GSR, RS) |
| 1996-1997 | Mitsubishi | Lancer Evolution | EVO 4 (GSR, RS) |
| 1998 | Mitsubishi | Lancer Evolution | EVO 5 (GSR, RS) |
| 1999-2001 | Mitsubishi | Lancer Evolution | EVO 6 (GSR, RS, Tommi Makinen) |
Specifications
| Detail | Value |
|---|---|
| Part Number | RAD20-1334-03 |
| Brand | Radium Engineering |
| Filter Element | Stainless Steel (100 micron) |
| Feed Hose Size | 8AN PTFE |
| Return Hose Size | 6AN PTFE |
| FPR Type | Rising Rate, Billet Aluminum |
| Gauge Type | Liquid-Filled Fuel Pressure Gauge |
| Compatible Fuel Types | Gasoline, E85, Methanol |
| Pump Compatibility | Walbro GSS342, F90000267/274/285, AEM 50-1220, Fuelab 49614, DW400/440/810 |
| Application | Mitsubishi Lancer Evolution 1-6 (4G63) |
| Warranty | Radium Engineering Limited Warranty |
| UPC | N/A |
What's Included
- Radium stainless steel fuel filter (100 micron, "-03" element)
- Radium billet aluminum fuel pressure regulator
- Liquid-filled fuel pressure gauge
- EVO 1-6 specific billet filter mounting bracket
- Two-piece billet filter clamp
- 8AN PTFE fuel feed hose
- 6AN PTFE return hose
- SAE quick-disconnect fittings
- Aluminum adapter fittings
- Stainless steel and aluminum hardware pack
Frequently Asked Questions
What is the difference between the RAD20-1334-01, RAD20-1334-03, and RAD20-1334-05 filter options?The suffix denotes the filter element material. The -01 uses a cellulose element for standard gasoline use. The RAD20-1334-03 uses a stainless steel element rated for gasoline, E85, and methanol, making it the preferred choice for flex-fuel and race builds. The -05 uses a microglass element for ultra-fine filtration in dedicated race applications. For a daily-driven EVO running pump E85, the stainless option is the correct choice.
Does this kit include a fuel pump?No, the plumbing kit is designed to work with a separately purchased high-flow fuel pump. Compatible pumps include the Walbro GSS342, Walbro F90000267, F90000274, F90000285, AEM 50-1220, Fuelab 49614, DeatschWerks DW400, DW440, and DW810. The pump drops into the Radium EVO 1-6 fuel hanger assembly, which is also sold separately.
Will this kit work on EVO 7, 8, or 9 chassis?No. This kit is designed exclusively for Mitsubishi Lancer Evolution generations 1 through 6 (1992 to 2001) with the 4G63 engine and the earlier fuel tank architecture. EVO 7, 8, and 9 use a different fuel hanger design and require a separate Radium kit specific to those generations.
Is this plumbing kit compatible with methanol injection?Yes. The stainless steel filter element is fully compatible with methanol, E85, and all common gasoline blends. The PTFE-lined hoses and aluminum fittings are likewise alcohol-safe, making the complete kit suitable for aggressive fuel setups including water-methanol injection stages common on high-power 4G63 builds.
Does this kit require cutting or custom fabrication?No. The RAD20-1334-03 includes an EVO 1-6 specific billet mounting bracket that bolts directly into the engine bay without modification. All hoses come pre-fitted. The installation is designed to be completed using basic hand tools, assuming the Radium 4G63 fuel rail is also in use.
What fuel pressure regulator is included?The kit includes a Radium Engineering billet aluminum rising-rate fuel pressure regulator. It integrates into the plumbing layout and works in conjunction with the included liquid-filled fuel pressure gauge so you can monitor rail pressure in real time. The FPR is compatible with standard MAP-referenced boost-referenced setups common on built EVO 4G63 applications.
How do I select the right pump flow rate to pair with this kit?Pump selection depends on your target power output and fuel type. For builds up to approximately 450whp on E85, the Walbro F90000267 or DeatschWerks DW400 are common pairings. For 500whp and beyond on E85 or methanol, the DeatschWerks DW810 or Walbro F90000285 are preferred. Use an online fuel calculator with your BSFC and target power to confirm pump sizing before ordering.
Is this a direct replacement for the OEM EVO fuel system components?No. This is a performance upgrade kit, not an OEM replacement. It replaces and improves upon the stock fuel filtration and regulation hardware to support higher flow rates and alcohol fuels that the factory system was not designed to handle. Professional installation is recommended for anyone unfamiliar with fuel system plumbing.
Can this kit support a flex-fuel sensor installation?Yes. The 8AN PTFE feed line included in the kit is compatible with an inline flex-fuel sensor such as the Zeitronix or ID Flex units. You would source the sensor separately and splice it into the feed line run. The stainless filter element and alcohol-compatible fittings in this kit make it a natural foundation for a full flex-fuel EVO 4G63 build.
Installation Overview
- Depressurize the fuel system by running the engine until it stalls, then disconnect the battery negative terminal.
- Remove the rear seat cushion and access panel to expose the factory fuel hanger assembly.
- Drain remaining fuel from the tank using an approved container and fuel pump, then disconnect the factory fuel hanger electrical connector and fuel lines.
- Remove the factory fuel hanger lockring using a spanner wrench and lift the assembly out of the tank carefully to avoid bending the float arm.
- Install the compatible high-flow fuel pump (sold separately) onto the Radium EVO 1-6 fuel hanger assembly per the pump manufacturer's instructions.
- Mount the billet filter bracket in the engine bay using the supplied hardware and attach the stainless filter using the two-piece billet clamp.
- Route the 8AN PTFE feed hose from the hanger assembly to the fuel filter inlet, then continue to the Radium 4G63 fuel rail inlet.
- Connect the 6AN PTFE return hose from the fuel pressure regulator return port back to the tank return fitting.
- Install the liquid-filled fuel pressure gauge to the FPR gauge port and verify all AN fittings are snug (do not overtighten PTFE-lined fittings).
- Reconnect the battery, cycle the ignition key to prime the pump several times, and inspect all fittings for leaks before starting the engine.
- Start the engine and verify fuel pressure at idle and under boost matches the target operating pressure for your tune.
WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.
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