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Parts for your 2006 Subaru Impreza-Fuel pump
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2006 Subaru Impreza fuel pump — what it does, where it lives, and when to service it
Yes, a fuel pump is absolutely fitted to the 2006 Subaru Impreza across all petrol variants (2.0R, 2.5i, WRX and STI). This is confirmed by Subaru’s Factory Service Manual for MY2006 Impreza (sections FU: Fuel Injection and EE: Engine Electrical), the Subaru Technical Information System (STIS), and the OEM parts catalogue, which list an in-tank electric fuel pump module, a fuel pump relay, and—on turbo models—a fuel pump controller. So it’s a relevant, essential part on this model.
The pump’s job is simple but critical: it pushes petrol from the tank to the engine at the correct pressure and flow so the injectors can meter fuel precisely. On most 2006 Impreza trims the pump sits inside the tank under an access panel beneath the rear seat. Base fuel pressure at the rail is about 300 kPa (around 43–45 psi) per the Subaru manual, managed either by a regulator in the module or, on WRX/STI, with a duty-controlled fuel pump controller in the boot to vary pump speed.
For everyday servicing, the pump itself isn’t a routine replacement item. What helps most is prevention: keep at least a quarter tank to keep the pump cooled and lubricated, use quality 95/98 RON fuel, and replace the in-tank strainer or filter element if the module design allows. Many 2006 models use an in-tank filter that’s part of the module, it’s serviced by opening the tank access, not under the bonnet like earlier years.
Common warning signs include hard starting after a hot soak, hesitation under load, surging, a loud whining from the tank, or lean/low-pressure fault codes (e.g., P0171, P0087). If these show up, a proper fuel pressure test against FSM specs is the next step.
- Before replacement: disconnect the battery, relieve fuel pressure (pull the fuel pump fuse/relay and crank briefly), and work in a well-ventilated area.
- Lift the rear seat base, remove the service cover, unplug lines/connectors, then withdraw the pump module. Always fit a new tank lid O-ring.
- Refit and tighten the ring/fasteners evenly to FSM spec, reconnect, cycle the ignition to prime, check for leaks, and recheck pressure.
Lifespan varies with fuel quality and heat—many see 150,000–250,000 km. Turbo cars place higher demand on flow, they also rely on the dedicated fuel pump controller, so diagnose both the pump and controller if pressures are off.
- Where is the fuel pump on a 2006 Impreza?
It’s in the tank under the rear seat. Pop the seat base up, remove the access panel, and the module is right there. No need to drop the tank for standard replacement.
- How often should the fuel pump be serviced or replaced?
It’s not a scheduled service item. Focus on clean fuel, the in-tank filter/strainer where serviceable, and testing pressure if symptoms appear. Replace the pump when noisy, weak on flow, or failing pressure tests.
- Are WRX/STI pumps different from non-turbo models?
Yes. Turbo variants use higher-flow pumps and a fuel pump controller. Some aftermarket pumps interchange, but always match flow and ensure compatibility with the controller and lines.
