Parts for your 2005 Subaru Impreza-Fuel pump

2005 Subaru Impreza fuel pump: what it does, when it fails, and how to look after it

Based on technical sources including the Subaru Factory Service Manual (FSM) for 2005MY Impreza (Fuel and Fuel Injection sections), the Subaru FAST parts catalogue for GD/GG chassis, and mainstream guides like the Haynes Subaru Impreza 2001–2011 manual, the 2005 Subaru Impreza is fitted with an in-tank electric fuel pump. It’s a key component of the electronic fuel injection system, supplying pressurised petrol from the tank to the fuel rail for consistent combustion.

On this model, the pump is part of a module that also houses the strainer and fuel level sender. Access is via a service cover under the rear seat base, so no need to drop the tank in most cases. The pump delivers steady pressure (regulated at the rail or within the module, depending on variant) to keep the EJ-series engine happy under all loads.

What it’s there for is pretty simple: without a healthy pump, the engine can crank forever, stumble on hills, or surge at highway speeds. Common clues the pump’s on the way out include a whining noise from the tank, hard starting when hot, loss of power under acceleration, or long crank times after sitting.

Replacement and servicing advice for a 2005 Impreza fuel pump is straightforward:

• Safety first: disconnect the battery, relieve fuel pressure per the FSM, and work in a well-ventilated area with no sparks or open flames.
• Access via the rear seat cover, unplug the connector, remove the retaining ring/fasteners, lift the module out, and avoid bending the float arm.
• Always renew the tank seal/O-ring and the strainer