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Radium Fuel Pressure Regulator Kit | 2008-2021 Subaru STI (20-0265) Radium Fuel Pressure Regulator Kit | 2008-2021 Subaru STI (20-0265) Radium Fuel Pressure Regulator Kit | 2008-2021 Subaru STI (20-0265) Radium Fuel Pressure Regulator Kit | 2008-2021 Subaru STI (20-0265) Radium Fuel Pressure Regulator Kit | 2008-2021 Subaru STI (20-0265)

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Radium Engineering

Radium Fuel Pressure Regulator Kit | 2008-2021 Subaru STI

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2008+ STi Fuel Pressure Regulator Kit by Radium

This kit is designed for use in the USDM 2008-2017 Subaru WRX STi (EJ257 only) and replaces the OEM fuel pressure regulator and damper assembly. The factory STi fuel line routing uses a quasi dead-end system that circulates fuel through the regulator, bypassing the engine. Fuel is only routed to the engine when there is demand.

The Radium FPR kit replaces the factory regulator and re-routes fuel to cycle through the engine's rails before reaching the regulator, and returning to the tank. This is the preferred fuel line routing by Subaru tuners trying to address stumbling issues. The Radium Fuel Pressure Regulator offers adjustment from 20psi-up with a 1:1 vacuum reference. Interchangeable orifices allow the user to tune the regulator for any fuel pump flow.

The kit installs in the same location as the OEM fuel pressure regulator. Also included are vacuum hose and fittings to re-route the vacuum reference line from the #4 cylinder runner to the intake manifold plenum for a more stable vacuum signal.

Features

  • Replaces the factory regulator and re-routes fuel to cycle through the rails before reaching the regulator
  • adjustment from 20psi-up with a 1:1 vacuum reference
  • Interchangeable orifices allow the user to tune the regulator for any fuel pump flow
  • installs in the same location as the OEM fuel pressure regulator
  • Includes vacuum hose and fittings to re-route the vacuum reference line from the #4 cylinder runner to the intake manifold plenum for a more stable vacuum signal

Also available are 2 options for the fuel pressure regulator top color.

Applications

  • 2015 - 2021 Subaru WRX STI
  • 2008 - 2014 Subaru Impreza WRX STi

What's In The Box?

  • 1 - Fuel Pressure Regulator
  • Plumbing, Fittings & Hardware

References

Warranty

  • Manufacturer's Warranty

2008+ STi Fuel Pressure Regulator Kit by Radium

This kit is designed for use in the USDM 2008-2017 Subaru WRX STi (EJ257 only) and replaces the OEM fuel pressure regulator and damper assembly. The factory STi fuel line routing uses a quasi dead-end system that circulates fuel through the regulator, bypassing the engine. Fuel is only routed to the engine when there is demand.

The Radium FPR kit replaces the factory regulator and re-routes fuel to cycle through the engine's rails before reaching the regulator, and returning to the tank. This is the preferred fuel line routing by Subaru tuners trying to address stumbling issues. The Radium Fuel Pressure Regulator offers adjustment from 20psi-up with a 1:1 vacuum reference. Interchangeable orifices allow the user to tune the regulator for any fuel pump flow.

The kit installs in the same location as the OEM fuel pressure regulator. Also included are vacuum hose and fittings to re-route the vacuum reference line from the #4 cylinder runner to the intake manifold plenum for a more stable vacuum signal.

Features

  • Replaces the factory regulator and re-routes fuel to cycle through the rails before reaching the regulator
  • adjustment from 20psi-up with a 1:1 vacuum reference
  • Interchangeable orifices allow the user to tune the regulator for any fuel pump flow
  • installs in the same location as the OEM fuel pressure regulator
  • Includes vacuum hose and fittings to re-route the vacuum reference line from the #4 cylinder runner to the intake manifold plenum for a more stable vacuum signal

Also available are 2 options for the fuel pressure regulator top color.

Applications

  • 2015 - 2021 Subaru WRX STI
  • 2008 - 2014 Subaru Impreza WRX STi

What's In The Box?

  • 1 - Fuel Pressure Regulator
  • Plumbing, Fittings & Hardware

References

Warranty

  • Manufacturer's Warranty

Customer Reviews

Based on 10 reviews
90%
(9)
10%
(1)
0%
(0)
0%
(0)
0%
(0)
C
Cheng Chang
Great

Loving it, great for upgrading fuel system

N
Nathen Seaman
Great

It was perfect. It looked nice installed perfectly and everything was there. Came a lot faster than expected. The instructions were spot on as well.

J
JEREMIAH C.
Gone are the Stumblies

Obliterated the "GR stumble" on my 2011 STi. I have upgraded injectors, fuel pump, other bolt-ons, and less than conservative tuning. An FPR was recommended to me by my tuner to smooth out the fuel delivery between 2800-3200 RPM. I purchased the Radium kit because I've heard nothing but good things about their products. This kit was all-inclusive, and I opted for the gauge and 90* fitting. Both were great quality and installed exactly as expected. The kit doesn't come with instructions, but Radium does provide them on their website. I've never known the car in stock form, so the stumble has always been lurking. I have to say, after installing the Radium FPR, this car behaves like stock in terms of smooth fueling through the entire powerband. Car seems quieter and, honestly, it's way more fun to drive. Big thanks to MAPerformance for offering both the FPR and gauge at a great price with incredibly fast shipping.

D
Donald Smith
Fixed 2nd gear stumble on 11' sti

This kit did fix my 2nd gear fueling related stumble as advertised, however it come with some unexpected issues.

First, every plug (ORB) leaked after install - which I fixed by swapping the supplied o-rings out with 90 durometer units & applying loctite 545 to the threads.

Secondly installing this kit did cause a very noticeable vibration in the fuel system due to the damper being removed (rattle in firewall, under car all the way to the tank)

That said everything seemed very well thought out & I'm not sure why I had so many leakage issues, perhaps my counter bores were not 100% correct?

Anyway, it's a good kit which allows you to maintain reliable steady fuel pressure - I'd suggest installing a damper though.

E
Essa ALABBAS
Great product

Good quality and fast shipping as always

MAP Limited Lifetime Warranty

1.) All MAPerformance in-house fabricated parts include a Limited Lifetime Warranty for the Original Purchaser. This warranty only applies to the original purchaser and is non-transferrable. If the product fails it would need to be determined by MAPerformance that it is due to manufacturing defects in materials or workmanship.

2.) This does not cover normal wear and tear. Improper use, modification, or abuse voids this warranty. MAPerformance will not be held responsible for additional costs due to the failure of a product (cost of sale, towing, labor, etc.). Warranty claims must be submitted to MAPerformance for review.

3.) You must create a support ticket to acquire your return authorization number prior to returning the product.

4.) Warranty claims will not be honored if the product was not purchased through an approved dealer.

For warranty evaluation please create a support ticket via this form Click Here For Customer Service.

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