Process West Anti-Surge Fuel System w/ Twin Walbro 460 Pump 08-14 WRX/STI

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Process West Anti-Surge Fuel System w/ Twin Walbro 460 Pump 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 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.  


  • 2.4 litre capacity
  • Absolutely zero pump noise
  • Walbro pumps come with built in check valve
  • Wiring harness included
  • Totally hidden when viewing from engine bay

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. 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.

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


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