Generator Fuel Polishing


Data Centres, banks, retail premises and other large commercial businesses rely on their fuel powered generators to ensure their businesses continue to run in the event of a power cut.

Your generators not firing up and working properly can cause major fiscal problems. Thankfully, this is easy to avoid and cost effective.

The most common problem for generators failing is because their diesel and generators fuel become contaminated. Diesel is an organic compound and when it is left to sit it can deteriorate (in as little as 60 – 90 days).

Diesel bugs are common in our atmosphere – they’re essentially all around us. Like all living organisms they require water to exist and live. Diesel bug will find it’s way into your diesel tank (or any storage tank), because if your tank isn’t full, it has some air, all air contains water vapours. These vapours condense and as a result, they form water droplets.

These droplets will drop into your diesel and sink because water is heavier than diesel – it then builds up!


Fuel contamination in your generator fuel tank can have a massive, negative impact on your business being able to function during in a power cut or loss of power.

Contamination’s really need to be captured by the primary filters, however bacteria is a large biomass that will quickly obstruct and clog your filters. If you do not clean your fuel the bacteria has the ability to double in size every 20 minutes.

Worse still, if the filters are unable to cope, contamination is likely to discover its way to the injectors of the generators engine. If this takes place, the most likely result is expensive engine repair work.

It takes just a few months for fuel sitting idle to begin to degrade. Realistically fuel is often left to sit for years and in the case of supermarkets and other large retail outlets and buildings, we are talking about thousands upon thousands of litres of fuel. In the UK, power cuts do not constantly happen (thankfully), but this also means that backup generators and their fuel storage tanks are left to sit. This is why our generator fuel polishing service is a must.


With regular fuel polishing, contaminants such as sludge, water, bacteria, germs and any solids or particles in the fuel tank are disposed of and “polished”.

Using our generator fuel polishing services will ensure that not only your fuel is free of contaminants and particulate-free, we will also ensure your fuel tank is clean. This will improve your generators combustion along with the elimination of carbon deposits. As an added bonus, the cleaner the fuel, the lower the consumption.


We use expensive and specialist generator fuel polishing equipment. Our equipment will remove the contents of your storage fuel tank using very fine filters. These filters will separate any dirt and microbes. Once the fuel is purified, and your storage tank is cleaned, we put the polished fuel back in-to your tank.

Your fuel is polished in this three phase process:

    1. The first stage: First we draw your diesel out of the fuel tank. Our equipment will spin off large solids (dirt, microbes and rust). These are heavier than diesel and drop to the bottom of the collection bowl.
    2. Second stage: Smaller water droplets will appear at the top surface of our filter. When heavy enough, they will also drop to the bottom of the collection bowl.
    3. Final stage:: This is the filtration stage. The filters will repel water, remove the contaminants and thus your fuel is separated and cleaned!

Having a build up of sludge, your tanks rust and other bugs and dirt in your fuel is never good.

Our fuel polishing and cleaning systems are of the highest quality. We polish fuel to ensure that all bugs are removed, removing even the tiniest amounts of dirt and bugs.

We use powerful equipment with fine filters and high pressure pumps – these are the 2 main components that guarantee a successful fuel polish. Have a filter that’s too big and bugs remain, have a pump that isn’t very powerful and fuel cleaning and diesel bug removal will take an incredibly long time.

There is much more science behind the scenes, that we are more than happy to explain. Contact us here.

We guarantee not to lose any of your fuel. We will polish, clean, filter and return every drop of fuel. We have worked on some of the largest fuel tanks in the country.

Generator fuel polishing - before pircture
Dirty fuel with sludge before fuel polishing
Clean fuel after polishing has taken place
CALL: 0121 493 2332

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