Marine & Agricultural Diesel Flushing

What is Diesel Flushing?

Diesel is susceptible to contamination due to the biomass content that is ever growing as the years go on and the environmental laws change. Diesel now contains what is known as biodiesel and has grown in over 3% in the last two years. This means that the diesel we use in our fuel systems is increasingly likely to be affected by Diesel Bug. Currently, diesel contains 7% biodiesel, which means it now attracts and holds more water. Unfortunately, however, with the better impact on the environment, these changes have brought a negative impact to the health of fuel systems in diesel engines.


Over time, water finds it way into the fuel tank. Whether it’s from condensation, absorption or rainwater penetration, it gets into the fuel and then, due to the high content of biodiesel within the diesel, bacteria and fungi begin to feed and produce at a rapid rate. This creates a sludge in the fuel which spreads throughout the engine.

Diesel Bug is becoming more common and is a serious problem that is often missed during general checks and services. Diesel is pumped from the fuel tank throughout the engine, before being atomised by the injector. As sludge builds up from the contaminated fuel, there’s a chance that it can enter the pump which would cause a breakdown. If given the chance to build up to this level, it can become a much bigger and much more expensive issue.

It’s vital to tackle this before it gets out of hand. Conventional methods would have you remove your fuel tank itself, disconnecting pumps and hoses, flushing out the diesel etc., which is a messy job and wastes diesel. However, our services provide a much simpler and cleaner method. Using our equipment there’s no need to remove the fuel tank, nor to waste any diesel. Our diesel duck simply connects to the fuel tank and begins to run the diesel through a filtration system which collects the sludge and contaminants, which are then removed at the end of the process.

What benefit does a Diesel Flush have?

Diesel contamination is most common in cases when the engine is left unused over time (marine and agricultural vehicles are biggest sufferers of diesel bug as they are not active during periods where weather or season do not permit the use of either machine), allowing water to enter the fuel tank and thus, bacteria and fungi contaminate the diesel within the fuel tank. The diesel is left resting as it is not being turned over, allowing plenty of time for the growth of organisms inside.

The easiest way to ensure your fuel system is clean is undergoing a diesel flush. A diesel flush pumps out all of the sludge and contaminants left behind by diesel bug, and also decontaminates the diesel within the fuel tank, by filtering it so that you also do not waste any diesel, in order to reduce the chances of the bacteria reproducing. There’s no way to tell the seriousness of this kind of contamination without cleaning the fuel tank, thus, there’s no way of knowing whether your diesel is or isn’t contaminated until it’s too late. If contaminated diesel is left untreated, it pumps sludge and


contaminants throughout the engine. This is certainly something to keep in mind after these dormant periods, or even over time when the engine is in constant use, even if it is simply for peace of mind.

It’s highly important to keep your fuel system in good condition. Without it, your engine wont last long and if untreated can be extremely costly. If it were a marine engine, you could end up broken down at sea, or, if it’s an agricultural vehicle it could mean having to hold off on tending to crops due to a break down, causing you to lose out on custom and annual turnover, or with a heavy goods vehicle could leave you late for deliveries. Just like your heart needs your lungs, your engine needs your fuel system to be in top condition to run at the performance you expect.

It’s best to act sooner rather than later, as you can never truly know how badly your diesel is contaminated. Diesel bug, like most bacterial issues, grows rapidly and can cause serious harm to your engine. Whether it’s a fishing boat, sailing boat, combine harvester, truck or any other marine, agricultural or HGV diesel engine, our services provide efficient means of ensuring a healthier fuel system. We operate at your location, saving you the trouble of commuting, and also offer our equipment for renting on a per 2 day basis.

The Diesel flush cleans out your fuel system, decontaminates your diesel and also treats and polishes it to make it less likely for this issue to reoccur.

Our Services

We provide a Diesel Flushing service for Marine and Agricultural engine's of all sizes. Our service assures that your fuel filter is cleared of sludge and grime, and that your fuel is decontaminated, to ensure some peace of mind that you wont break down in the middle of the sea, or in the middle of your field. 


Our pricing is based on a per-liter basis, starting at 100-150 liter's right up to 400 - 500 liter's. When you book a Diesel Flush, on the date given for your service we will arrive with our equipment to the location of your vehicle. After we set up, the process will begin which, depending on the size of your fuel tank can take anywhere from 2 hours to 8 hours. This process involves dewatering, cleaning and polishing to ensure your diesel is fully decontaminated.

There are three types of Diesel Flush that we provide. A full diesel flush consists of dewatering the diesel to remove contaminants, cleaning of the system to remove any sludge from the fuel and filter, and polishing, to filter your fuel of any contaminants of up to 2 microns to ensure it's completely clean and help prevent contamination from reoccurring. We can carry out a more basic flush of just dewatering and cleaning, which also does a great deal in treating your fuel. Prices will vary depending on the job selected.

We also rent our equipment out on a 2-day basis, starting at €150. Each additional day with have an additional charge of €50 following the 2-day standard rate. 

Each job is treated differently, and so, charges may differ. Therefore a quote will be given prior to the job being confirmed. In order to receive a quote, you can e-mail, or call +353 83 132 9311.

Price Quote


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