Parts for your 2016 Subaru Impreza-Fuel pump

2016 Subaru Impreza fuel pump: what it does, when to replace, and how to look after it

Yes, the 2016 Subaru Impreza uses a fuel pump, and it’s very much relevant. Technical references that confirm this include the Subaru Factory Service Manual (2016 Impreza GP/GJ, Fuel Injection/Fuel Delivery section), the Subaru Technical Information System (STIS), and the Subaru Genuine Parts Catalogue, which lists an in-tank electric “fuel pump module” for FB20-powered Impreza models. Aftermarket and workshop guides such as Haynes (Impreza 2012–2016) also publish a removal/refit procedure for the in-tank electric pump assembly.

On this model, the pump sits inside the tank beneath the rear seat as part of a sealed module that also houses the fuel level sender and pressure regulation. Its job is to deliver a steady, high-pressure supply of petrol to the injectors so the FB20 engine can meter fuel precisely under all conditions—cold starts, highway cruising, even a quick overtake. Because it’s a returnless, in-tank setup, it runs cooler and quieter than older external pumps, and it helps reduce evaporative emissions.

There’s no routine service interval for the pump itself, and the fine fuel filter is integrated in the module on late-model Subarus, so it’s not a regular service item either. Good habits go a long way: avoid regularly running the tank near empty (the pump relies on fuel for cooling), use quality fuel (E10 is fine where specified), and keep the cap sealing properly to maintain tank pressure and EVAP health. If the car’s racking up big kilometres or has lived on poor fuel, preventative replacement of the in-tank strainer when the module is out can be worthwhile.

When replacement is needed—usually due to long crank, loss of power under load, whining from the tank, or stalling—access is via the rear seat base and service cover. Standard workshop practice applies: disconnect the battery, safely relieve fuel pressure, work in a well-ventilated area with no ignition sources, and replace the module seal/O-ring and lock ring if specified. After install, cycle the ignition to prime the rail, check for leaks, and verify pressure meets spec with a gauge or scan data. Many workshops choose a complete OEM-style module for reliability, but a quality pump cartridge can be a budget-friendly fix if the rest of the assembly is sound.

• Common clues of a tired pump: hard starting, surging, hesitation on hills, louder-than-usual hum from the tank, and lean fault codes.
• Handy tip: if the pump’s intermittent, a quick rail pressure test during a hot soak can save hours of guesswork.

Popular questions

Where is the fuel pump on a 2016 Subaru Impreza?
It’s an in-tank electric pump, mounted as a module under the rear seat. Lift the rear seat cushion to reach the service cover