Cairns Diesel Service have specialised in Diesel Fuel Injection for over 60 years with a team of qualified experts that have very extensive knowledge of Diesel Fuel Injection solutions. We perform repairs, overhauls and testing on a wide range of Injectors and Pumps.

We are the only Certified Bosch Workshop in FNQ and home to the latest Bosch and Hartridge Test benches on the market. This allows us to perform advanced testing and even more efficient repairs.

Custom 12mm & 11mm Diesel Fuel Pump Upgrades

At Cairns Diesel Service, we specialise in building high-performance 11mm and 12mm diesel fuel pumps for serious power, towing, and off-road performance. Whether you’re chasing dyno numbers or just want reliable torque for your rig, our custom pumps are built in-house to match your setup.

What’s the difference?
The size refers to the internal plunger diameter — with 12mm pumps delivering significantly more fuel per stroke compared to standard or even 11mm setups. This makes them ideal for high-performance applications, but they’re not a drop-in upgrade — proper injectors and ECU remapping are required for safe, reliable performance.

Built by Diesel Injection Experts
We don’t just slap in a bigger plunger — our upgraded pumps are completely overhauled and tested on state-of-the-art Bosch and Hartridge test benches. Every component is inspected, recalibrated, and tuned to your needs — whether it’s for a turbo diesel Hilux, Patrol, LandCruiser or agricultural equipment.

Pair It with the Right Mods
A 12mm pump is just one part of the equation. We’ll help you match it with:

• High-flow diesel injectors

• ECU remapping or chip tuning

• Boost, Turbo and airflow upgrades

Not sure what you need?
Fill out our custom quote form and we’ll get back to you with the best combination for your build and budget.