
Emptying a fuel oil tank can be a challenging and potentially hazardous task. It is important to take the necessary precautions and follow the proper procedures to ensure safety and compliance with environmental regulations. The process typically involves draining the oil, cleaning the tank, and disposing of the waste properly. Depending on the size and location of the tank, as well as the amount of oil to be removed, the complexity of the task can vary. In some cases, it may be advisable to engage a professional service provider with the appropriate expertise and equipment to handle the job safely and efficiently.
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What You'll Learn

Use a fuel transfer pump to empty the tank
Using a fuel transfer pump is an effective way to empty a fuel oil tank. This method is relatively simple and can be done with a portable, battery-operated pump, or a drill-powered pump.
To begin, you will need to purchase or rent a fuel transfer pump. Online retailers and local hire stores are good options for this. Additionally, you will need drums suitable for storing heating oil. These can be costly, ranging from £5-£8 per 20 litres. If you only plan on using the pump once, it may be more economical to hire one.
Once you have the necessary equipment, the process is straightforward. First, place the filter end of the pump into the oil tank, ensuring it reaches the bottom. Then, place the trigger end into the drum or new oil tank. If your pump is battery-operated, connect the alligator clips, red to positive and black to negative. If your pump is drill-powered, attach it according to the manufacturer's instructions.
With the pump in place, you can now begin transferring the oil. Press the button on the pump, or pull the trigger, to start the transfer. A good quality fuel transfer pump can move up to 40 litres of heating oil per minute, so be ready to turn the pump off and switch drums as needed. As the tank empties, the transfer of oil will slow down, especially when the filter is no longer fully submerged. To address this, stop the pump and elevate the far end of the tank so that the remaining oil runs towards the filter.
After transferring the oil, it is important to perform a final step to prevent any issues down the line. Pump some soapy water through the pump to ensure that no oil remains inside.
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Dispose of the oil safely
If you are disposing of a plastic domestic oil tank, there are several options for the heating oil left in the tank. Firstly, you can donate the oil to a neighbour, family member, or friend. Secondly, you can transfer the heating oil to your new tank. Lastly, you can dispose of the leftover oil.
Before you donate or transfer your heating oil, you should consider how long the heating oil has been sitting in the tank. Kerosene, for example, has an expiration date of 18 months to 2 years before it naturally degrades.
If you are disposing of the oil, you should follow the guidelines on the safe and legal ways to do so. Fuel oil is extremely toxic and flammable, so removal should be left to professionals. A local removal contractor will be able to extract the reusable oil from your tank using a special explosion-proof pump. The oil can then be filtered and reused.
If you are going to empty your own heating oil tank, remember to wear protective safety equipment. This includes protective clothing, gloves, and eye protection.
There are several methods you can use to empty the tank. One way is to use a siphon pump. First, remove the vent pipe and fill pipe from the tank. Then, put the end of the pump's inlet hose into the tank so that it is fully immersed in the oil and the other end into the container where you want the oil to go. You may need to extend the length of the hose by clamping on some extra hose. Another method is to let the oil flow out into shallow pans and then pour the oil through a funnel into a can. However, this method will not get all of the oil out of the tank. You can also use a fuel transfer pump to move the oil into drums. Make sure to be careful as a 25-litre drum will fill up quickly.
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Cut supply pipes and detach from the wall
Before cutting supply pipes and detaching them from the wall, it is important to empty the fuel oil tank. This is because fuel oil is extremely toxic and flammable, so it is recommended that the removal is left to professionals. However, if you are determined to do it yourself, you can use a fuel transfer pump to move the oil into drums or containers suitable for heating oil. Most fuel transfer pumps are portable and do not need an electric power supply. Instead, they can be attached to a car or leisure battery to operate.
When using a fuel transfer pump, place the filter end into the oil tank until it reaches the bottom. Then, place the trigger end into a drum or new oil tank. Connect the alligator clips to your battery, ensuring that red goes to plus and black to minus. Press the button on the pump to start transferring the oil. Be careful when filling drums, as a 25-litre drum will fill up quickly. Be ready to depress the trigger and turn the pump off before switching to the next drum.
Once the tank is empty, you can cut the supply pipes using a saw or metal cutting blade and detach them from the wall. It is recommended to have a buddy assist you with this process for safety and ease of handling. Make sure to dispose of the oil and sludge properly, as they are considered hazardous waste.
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Clean out the sludge inside
Sludge is a serious threat to your heating oil storage tank. It clogs the oil pipes, safety valves, and filter noses, blocking the oil flow. It contains chemicals that corrode the inner wall of the tank, shortening its useful life. Sludge is also dangerous for your health and the environment.
To clean out the sludge inside your tank, you should first drain the tank completely. Place a plastic bucket under the tank's drain valve and remove the valve cap. Let all the oil and sludge flow from the tank into the bucket. When the outflow has stopped, remove the bucket and place it somewhere out of the way.
Next, put another bucket under the drain valve and spray clean water into the tank. Let the water drain out until it runs clear, then close the valve. Scrub the inside of the tank with cleaning rags to remove any remaining sludge and grime.
Once you have done this, fill the tank with fresh water and add a cleaning agent, such as trisodium phosphate cleaner or denatured alcohol. The amount of cleaner to be added should be given in the instructions. Insert an air hose into the tank and start the air pump. Leave it for 12 hours, then open the valve and drain the solution out of the tank.
After this process, your tank should be free of sludge. However, if your tank is already leaking or has a lot of rust, it is best to replace it rather than try to remove the sludge.
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Hire a professional to remove the tank
Fuel oil tanks are heavy, unwieldy, and difficult to move. They are also potentially dangerous, as fuel oil is extremely toxic and flammable. For these reasons, it is highly recommended to hire a professional to remove your fuel oil tank.
Professionals will have the necessary equipment and expertise to safely and efficiently remove your tank. They will also be able to properly dispose of the waste, which can be hazardous. Attempting to remove the tank yourself could result in injury or damage to your property.
The cost of hiring a professional to remove your fuel oil tank will vary depending on your location and the specifics of the job. For example, the average cost of removing an above-ground storage tank in New York State is around $2,600, while the cost of removing an underground storage tank can range from $10,000 to over $1 million, with an average cost of $130,000.
When choosing a professional removal service, it is important to ensure that they are permitted to work in your area and that they carry pollution liability insurance. This will protect you in case of any accidents or incidents during the removal process.
To find a reputable professional to remove your fuel oil tank, you can search online for local companies that offer this service. You can also ask for recommendations from friends or family members who have previously had their fuel oil tanks removed. Getting multiple quotes from different companies will help you find the best price and service for your needs.
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Frequently asked questions
You can empty a fuel oil tank using a fuel transfer pump and drums suitable for heating oil. Place the filter end of the pump into your oil tank until it reaches the bottom of the tank, then place the trigger into a drum or your new oil tank. Connect the alligator clips to your battery, red to plus and black to minus, then press the button to start the transfer of oil.
Over time, sludge can accumulate at the bottom of your tank. After removing the salvageable oil, cut open the tank and carefully clean out the remaining sludge, which can be recycled for use in heavy industrial capacities.
Disposal of a used fuel tank falls under hazardous waste recycling. Contact your local removal contractor to safely dispose of the tank.
Fuel oil is extremely toxic and flammable, so it is recommended to leave the removal process to professionals. Make sure they carry pollution liability insurance and are permitted to work in your area.
Instead of emptying your fuel oil tank, you can consider upgrading to a cleaner, more efficient, and cost-effective heating system. Geothermal heating systems, for example, can be a good alternative to fuel oil.











































