Radium Engineering FPR RA Fuel Pressure Regulator Kit - Subaru STI 08-21

Name: Radium Engineering FPR RA Fuel Pressure Regulator Kit - Subaru STI 08-21
Brand: Radium Engineering
SKU: 20-0965
Price: 471.99 AUD
Availability: InStock

by Radium Engineering

SKU 20-0965

$471.99 - $471.99

$471.99

$471.99 - $471.99

$471.99

Description

Radium FPR RA Fuel Pressure Regulator Kit - Subaru STI 08-21

Application: Subaru WRX STI (2008-2021) - EJ257
Part Type: Fuel pressure regulator kit with RA-series multi-port regulator
Part Number: 20-0965

The Radium FPR Kit replaces the OEM fuel pressure regulator and damper assembly on the 2008-2021 Subaru WRX STI. The factory STI layout is a quasi dead-end system - this kit reroutes fuel through the fuel rails first, then through the regulator and back to the tank, the arrangement Subaru tuners prefer for curing stumbling issues. The vacuum reference is also rerouted from the #4 cylinder runner to the intake plenum for a steadier signal.

The RA-series regulator installs in the OEM regulator location and features tool-less pressure adjustment, a single stainless steel return orifice for laminar flow and a 360° swivelling, double O-ring sealed vacuum port.

Key Features

Return-Style Routing: Fuel passes through the rails before the regulator and returns to the tank
Improved Vacuum Reference: Rerouted from the #4 cylinder runner to the intake plenum for a steadier signal
OEM Location: Regulator installs where the factory regulator was mounted
Stable Pressure: Single stainless steel return orifice designed for laminar flow
Tool-less Adjustment: Turn the knob to set fuel pressure - detents give approx. 1 psi (±0.5 psi) per click, no jam nut or set screw
Swivel Vacuum Port: 360° swivelling, double O-ring sealed vacuum reference port
Interchangeable Vacuum Fittings: Four 10-32 threaded fittings: 5mm barb, 3AN male, push-to-connect and vacuum plug
Fuel Compatibility: All petrol types (unleaded, leaded, oxygenated, pre-mix) plus methanol, ethanol and E85

What's Included

RA-series multi-port fuel pressure regulator
OE fuel line disconnect tool
SAE quick connect to AN adapters
EFI hose and PushLok hose ends
Vacuum hose
All necessary fittings and installation hardware

Optional Parts

Radium Fuel Pressure Gauge w/8AN ORB Adapter (20-0386) - Installs in the unused 8AN ORB port on the regulator for setting and monitoring fuel pressure

Important Notes

Radium lists fitment for the USDM 2008-2021 WRX STI with the EJ257 engine only - contact us to confirm fitment for your vehicle
Fuel pressure gauge is sold separately
A rapid fuel pressure drop after shut-off is normal for aftermarket regulators - pressure resets when the pump runs again
Long cranking or slow pressure build-up is not caused by the regulator - it typically indicates fuel draining back to the tank from an internal pump module leak (e.g. venturi jet pump or missing check valve)
Installation instructions are available in the Instructions tab

Vehicle Fitment

Subaru WRX STI (2008-2021) - EJ257 engine only

For application support, send your vehicle details to TJ Auto Parts through the Parts Finder.

Compatibility

Supplier-listed applications:
- Subaru WRX STI (2008-2021) - EJ257 engine only

Note: Compatibility information is provided as a general guide only. Some vehicles may have multiple part variations for the same model or engine. To ensure this product is the correct fit and to be eligible for our Fitment Guarantee, please contact our team before purchasing.

FAQs

Can’t find the part you’re looking for?
If you can’t find the part you need, please fill out our Fitment Finder or visit our Contact Us page. One of our expert team members will respond promptly to assist with your enquiry.

How do I make payment?
Payment is completed during checkout. We accept all major payment methods via Shopify Payments including credit/debit cards, Apple Pay, Google Pay, and more. Direct bank transfer is also available please contact us at contact@tjautoparts.com.au for bank details and instructions.

How long will it take to process my order?
We aim to process and dispatch all orders within 1–2 business days. If there are any delays, we will notify you promptly via email.

What if I’ve seen a cheaper price elsewhere?
We always aim to offer the best value. If you’ve found a better price elsewhere, get in touch with us and we’ll do our best to match or beat it.

Where do the products come from?
All products are sourced directly from the manufacturer or authorised suppliers to ensure authenticity. Every item is backed by the manufacturer’s warranty.

Do you offer trade accounts or special pricing?
Yes, we offer trade accounts and pricing for qualified customers. To find out more or apply, simply email us at contact@tjautoparts.com.au and our team will assist you.

To see more FAQs visit our FAQs page or get in touch today.

Shipping & Returns

Shipping Rates
We offer free standard shipping on all orders over $150 (excluding bulky items). For orders under $150. Standard shipping starts at $9.95. Express shipping starts at $14.95. Shipping costs can be calculated in the cart or at checkout. Orders containing bulky items such as batteries, brake discs, liquids, and lift kits may incur additional shipping charges, particularly to remote or regional areas.

Dispatch & Handling
We aim to process and dispatch all orders within 1-2 business days. In the event of any delays, our customer service team will notify you. Tracking numbers are sent via email once your order has been dispatched and can also be accessed from your account.

For enquires on same day delivery or pickup, please contact our team before ordering to check availability. Custom or order in only items may have longer lead times. For more details on shipping, see our Delivery information page.

Returns and Refunds
If you change your mind or need to cancel an order, simply contact us at contact@tjautoparts.com.au within 30 days of delivery. Items should be unused and in their original packaging. A small restocking/admin fee of 5–20% may apply to help cover processing costs. This fee is only applicable at the discretion of our staff and may not apply to all orders. Return shipping is covered by you unless we sent the wrong or faulty item, in which case we’ll take care of it. Once we receive your return, refunds are processed quickly, usually within 48 hours, with up to 5 business days for your bank to complete the transfer.

We’re here to help make returns easy and hassle free! Contact us with any questions.

Warranty
All products come with the manufacturer’s warranty. If you experience any issues, please contact us at contact@tjautoparts.com.au. For full details on warranty coverage and claims, please visit our Returns page.