Parts for your 2005 Mitsubishi Pajero-Fuel pump

2005 Mitsubishi Pajero Fuel Pump — What it Does and When to Service It

A fuel pump is absolutely fitted to the 2005 Mitsubishi Pajero. Technical documentation confirms this fitment: the Mitsubishi Motors Service Manual for Pajero/Montero (2005 model year, Group 13A Fuel for the 6G75 petrol and Group 13B Common Rail Diesel for the 4M41) specifies an electric in-tank fuel pump module on the petrol V6, and a Denso high-pressure supply pump on the 3.2 Di-D diesel. Denso’s common-rail literature for the HP3 pump family also lists the 4M41 application in this period.

On the 3.8-litre petrol V6, the in-tank electric fuel pump lifts fuel and maintains the correct rail pressure so the injectors can deliver clean, metered fuel at all loads—cruising the motorway, towing a van, or tackling corrugations. On the 3.2 Di-D, the engine-mounted high-pressure pump feeds the common-rail at very high pressure for crisp starting, torque, and efficiency, depending on market, supply can be assisted by a hand primer at the fuel filter and, in some variants, a low-pressure lift arrangement.

Routine servicing doesn’t usually include replacing the pump itself, but looking after the system pays off:

• Fuel filter: for diesel, replace at the intervals in the service schedule (often 20,000–40,000 km depending on conditions) and drain any water separator. For petrol models, the strainer is part of the in-tank module and is typically renewed with the pump if it’s out.
• Fuel quality: stick with reputable fuel, contamination is tough on both electric and high-pressure pumps.
• Inspections: watch for hard starts, hesitation under load, noisy whine from the tank (petrol), diesel surge, or fault codes for low rail pressure. Have pressure/flow checked against the workshop manual specs.

Replacement tips: the petrol in-tank module swap involves battery isolation, safely relieving system pressure, lifting the pump module from the tank, and always fitting a new sealing ring and correctly torquing the locking ring. The diesel high-pressure pump is precision gear—clean-room standards, correct timing/alignment, and proper priming are vital, most workshops treat it as a specialist job. After any fuel system work, priming/bleeding and leak checks are a must. Genuine or high-quality OEM-equivalent parts help keep the Pajero dependable on long Kiwi and Aussie runs.

Where is the fuel pump on a 2005 Pajero?

The petrol V6 uses an electric pump inside the fuel tank as part of a module accessed from above the tank. The 3.2 Di-D diesel uses a Denso high-pressure pump mounted on the engine, with fuel drawn through the filter, some markets include a hand primer at the filter head.

What are common signs the Pajero’s fuel pump is on the way out?

Hard starting, stumbling on hills, surging, loss of power at high load, a whining noise from the tank (petrol), and diagnostic trouble codes for low fuel/rail pressure are typical flags. A proper pressure or rail-pressure test against spec confirms it.

Should the fuel pump be replaced as regular maintenance?

No—pumps are replaced on condition. Preventative care is focused on clean fuel, timely fuel-filter changes (especially on diesel), and fixing any air or leak issues. Replace the pump if testing shows it’s out of spec or it’s noisy/failing.