When it comes to keeping your generator running reliably and efficiently, fuel quality matters more than most people realise.
At PowerGen, we’ve seen first-hand how dirty or contaminated diesel can cause serious issues for both standby and prime power generators – from clogged filters and injector damage to complete engine failure.
That’s why we always recommend regular diesel cleaning and polishing as part of a smart generator maintenance plan.
What Is Diesel Polishing?
Diesel polishing is a filtration process that removes water, sludge, microbial growth, and other contaminants from your diesel fuel.
It’s not just a surface-level clean – it’s a full “deep clean” that restores the diesel in your tank to a usable, high-quality condition.
The process typically involves circulating the fuel through a multi-stage filtration system that separates and removes particles, water, and biological contaminants.
This is particularly important for generators that rely on stored diesel over long periods – such as backup systems in commercial buildings, hospitals, or industrial sites.
Why Does Diesel Go Bad?
Diesel fuel, like anything organic, degrades over time.
Even if it’s stored in a sealed tank, exposure to air, condensation, and fluctuating temperatures can cause problems like:
- Water contamination (from condensation inside the tank)
- Microbial growth (bacteria and fungus thrive in the water-fuel layer)
- Sludge formation (resulting from oxidation and microbial activity)
- Filter and injector blockages (due to solid particles and degraded fuel)
Once contaminated, the fuel doesn’t burn cleanly – putting strain on your engine, reducing efficiency, and increasing emissions.
In worst-case scenarios, bad diesel can prevent your generator from starting during a critical power outage.
Why Diesel Polishing Is Essential for Generators
At PowerGen Australia, we can’t stress this enough: clean diesel means reliable power.
Here’s why polishing is crucial:
- Protects your investment – Generators aren’t cheap. Clean fuel extends the life of your engine and components.
- Ensures readiness – Standby generators must be ready to go at a moment’s notice. Bad fuel is one of the most common reasons for failure during emergencies.
- Reduces maintenance costs – Removing contaminants prevents filter blockages, injector fouling, and costly repairs.
- Improves performance – Clean fuel ensures optimal combustion, better power output, and lower emissions.
When Should You Have Your Diesel Polished?
If your diesel has been sitting for more than 6–12 months, or if you’ve noticed signs like discoloured fuel, clogged filters, or reduced performance, it’s time to have your fuel assessed.
At PowerGen, we offer full diesel testing, cleaning, and polishing services across Sydney – with minimal downtime and maximum peace of mind.
The Importance of Diesel Polishing
Generator performance doesn’t just depend on the engine – it starts with the fuel.
Regular diesel cleaning and polishing is an often-overlooked but critical part of generator care. If your generator is part of your emergency power plan, don’t take the risk of contaminated diesel.
At PowerGen, we help Sydney businesses stay powered up and protected. Contact us today to schedule a fuel assessment or diesel polishing service.