Parts for your 2018 Mitsubishi Asx-Fuel pump

2018 Mitsubishi ASX fuel pump — what it does, where it sits, and how to look after it

Yes, the 2018 Mitsubishi ASX is fitted with a fuel pump. On Australian and New Zealand models with the 2.0‑litre petrol engine (MIVEC 4B11), it uses an electric, in‑tank fuel pump module. Diesel variants offered in some markets also rely on a lift pump and a high‑pressure pump. This is documented in the Mitsubishi Motors ASX/Outlander Sport Service Manual (2017–2019, Group 13A – Fuel), the Mitsubishi ASA electronic parts catalogue for the GA2W platform (listing a “fuel pump module” assembly), and mainstream workshop data providers used in AU/NZ service trade (e.g., Autodata), which note the in‑tank pump and a non‑serviceable in‑tank filter/strainer.

In the 2018 ASX, the fuel pump’s job is to deliver a steady supply of petrol from the tank to the engine at the correct pressure for the port‑injected system. The pump module sits inside the tank, typically accessed under the rear seat base via an inspection cover. It houses the electric pump, a pressure regulator, a strainer, and the fuel level sender. The engine ECU commands the pump via a relay, priming briefly when the ignition’s switched on and then running as needed to keep pressure stable under all driving conditions.

There’s no scheduled replacement interval for the pump on this model, and the in‑tank strainer is generally “non‑serviceable” outside of module replacement. As part of normal servicing, a technician will usually listen for the brief prime (a soft hum), check for fuel‑related fault codes, and verify rail pressure if drivability concerns pop up. Keeping at least a quarter tank of fuel helps cool the pump, and sticking to quality petrol goes a long way towards longevity.

Replacement is straightforward for a trained tech but needs care. The battery should be disconnected, fuel system pressure safely relieved, and work carried out in a well‑ventilated area away from sparks. The locking ring and seal should be inspected and the tank O‑ring replaced to prevent vapour leaks. It’s smart to verify the correct pump module by VIN, as trims can differ across markets. After fitting, a quick key‑on prime and a leak check are essential, followed by a scan for any stored codes and a short road test.

• Common signs it’s time: hard starting, hesitation under load, a loud whine from the tank, stalling at low fuel, or DTCs such as low fuel pressure.
• Good habits: don’t regularly run the tank near empty, use reputable fuel, and address any misfire or contamination issues promptly.

Technical sources referenced: Mitsubishi Motors ASX/Outlander Sport Service Manual (2017–2019), Group 13A – Fuel, Mitsubishi ASA Electronic Parts Catalogue for GA2W platform, Autodata service information for 2018 Mitsubishi ASX (AU/NZ), fuel system specifications and service notes.

Popular questions

Where is the fuel pump on a 2018 Mitsubishi ASX?
It’s an electric pump integrated into a module inside the fuel tank. On most ASX models, it’s accessed via an inspection cover beneath the rear seat base, making replacement possible without dropping the tank in many cases.

How long should the fuel pump last?
With clean fuel and normal use, the in‑tank pump often lasts well past 150,000 km. Heat and running on near‑empty can shorten its life, so keeping at least a quarter tank helps keep it cool and happy.

Can the fuel filter be replaced separately?
On this model, the primary filter/strainer is part of the in‑tank module and isn’t a scheduled service item. If it’s clogged or the pump is failing, the usual fix is replacing the complete pump module, including a new tank seal.