Anti-Surge Fuel System

Product Code: # PWFS03
Model Compatibility: Subaru 08-14 WRX/STI


PW | Anti-Surge Fuel System | suits Subaru 08-14 WRX/STI

Our new fuel anti-surge system is the ultimate in fuel delivery for your G3 WRX or STi.

In early 2008 Process West released a true plug and play anti-surge system for the MY97 to MY07 WRX/STi. We sold many 100s of these units in the last 4 years.

The original system was based on a hand fabricated surge vessel with an externally mounted Bosch Motorsports 044 pump. Now in October of 2013 we have raised the bar. It was time to modernise the product and bring it up to date with the requirements of modern car fuelling and fuel types.

The new system sees the pump (or pumps) mounted internally to an externally mounted anti-surge vessel made from 6061 billet aluminium. The vessel is mounted just above the transmission cross member. This is not an in-tank system.

One of the main objectives when designing the system was making sure the system was easily upgradable when the need for higher fuel flows is required. The “basic” system comes installed with 1 x Walbro 460 LPH pump and is a simple plug and play option.

The “basic” single 460 system will satisfy the fuel delivery requirements of 90% of applications. This single pump system will support 550kw at the wheels on petrol (gas) and is a simple plug and play system

Single pump systems come complete with all fuel lines etc to complete the installation.

Alternatively we offer a twin Walbro 460 system.

The twin Walbro 460 system will support 750kw at the wheels on petrol (gas).

When purchasing a twin pump system it is worth noting that the system concludes at the pump outlets of the surge tank. From this point on you will need plumb into your existing system.

When a second pump is added to the system the flow is greatly increased and the factory fuel pressure regulator is unable to control fuel pressure. At this point you will need to install an aftermarket fuel pressure regulator. For this reason all twin pump systems are configured with -6 AN fittings at the pump outlets to enable ease of plumbing into after fuel rails etc.

Both systems come with a pre-assembled wiring harness. Wiring installation is very simple and only requires soldering of 2 wires.

Package Includes

1 x Anti-Surge Fuel System (Available in Single or Twin Pump)

Key Features

  • 2.4 litre capacity
  • Absolutely zero pump noise
  • Walbro pumps come with built in check valve
  • System can be easily upgradable from single system to twin system
  • Wiring harness included
  • Totally hidden when viewing from engine bay


  • We advise against increasing the power output substantially on high kilometer engines, if your engine has in excessive of 150,000kms please contact us to discuss options.
  • Whilst every attempt is made to ensure prices listed online are correct, they are subject to change at any time.
  • Additional parts may be required in some cases depending on the condition of the vehicle. Cost of these parts and additional labor required may incur additional cost.
  • Images are for illustration purposes only.

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