
Pumping fuel oil from an underground tank can be done in several ways. One method is to use a pump, such as an electric pump, a diaphragm pump, or a fuel transfer pump with a long hose. Another approach is to use gravity by tilting the tank or using a valve on the hose to control the flow. Additionally, some people suggest using a drill pump or a sprinkler pump, which can be purchased at a relatively low cost. Before pumping, it is important to determine the amount of fuel in the tank, which can be done using a dipstick or clear tubing taped to a long stick.
| Characteristics | Values |
|---|---|
| Method to check fuel level | Use a dipstick or a clear tube taped to a long stick |
| Pump type | Air-operated, diaphragm, electric, drill-driven, transfer, barrel, water |
| Pump cost | $70, $7, $150 |
| Additional tools | Hose, garden hose adapter, funnel, shallow pans |
| Precautions | Avoid a 3/4" pipe thread adapter to prevent leaks |
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What You'll Learn

Using a dipstick to check fuel levels
Using a dipstick is a reliable way to check the fuel level in your tank. It is a graduated measuring device that tells you exactly how much fuel you have in your tank. Dipsticks can be either calibrated or uncalibrated. Calibrated dipsticks will tell you exactly how much fuel you have in your tank in terms of gallons, while uncalibrated dipsticks will measure the inches of fuel.
To use a dipstick, start by opening the tank's cap. Then, insert a clean dipstick into the tank until it touches the bottom. Withdraw the dipstick and check the oil level against the markings to determine the amount of fuel remaining. If you are using an uncalibrated dipstick, you will need to convert your measurements to gallons using a tank chart.
It is important to note that using a dipstick can be time-consuming, especially if you are alone and need to leave the helm to perform the task. In addition, if the fuel is sloshing around, it can give a poor or false reading. Therefore, it is recommended to combine dipstick measurements with fuel gauge readings for a more accurate and convenient way to monitor your fuel levels.
For those with underground oil tanks, it is common to use a dipstick to check fuel levels. This eliminates the need to remove the tank, which can be costly and inconvenient.
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Using a pump to transfer oil
Choosing the Right Pump
- Electric pumps: Electric pumps are a popular choice for transferring oil. They can be purchased from hardware stores or online retailers. Ensure that the pump is specifically designed for transferring oil and flammable liquids. Consider the power source, such as a 12-volt battery, and the compatibility of the pump with your setup.
- Air-operated pumps: Air-operated pumps, such as diaphragm pumps, are another option. These pumps work well with air pressure and can quickly empty a tank. Look for pumps that can handle flammable liquids safely.
- Manual pumps: If you don't have access to electricity or air pressure, you can use a manual hand crank pump. These pumps are slower but can get the job done cheaply and cleanly.
Preparing the Pump and Hoses
- Ensure that you have the correct hoses for your pump that are compatible with oil transfer. Consider using reinforced hoses to prevent collapsing during the pumping process.
- Plumb the hoses into the line, following the manufacturer's instructions for your specific pump.
- If you're using an electric pump, hook it up to a power source, such as a 12-volt battery.
Transferring the Oil
- Insert the hose down into the underground tank. If there is a filler neck, you can drop the hose down to reach the oil.
- Start the pump according to its instructions. Some pumps may have specific requirements for priming or activating the pumping mechanism.
- Monitor the pumping process to ensure that it proceeds smoothly and safely.
- Transfer the oil to an appropriate storage container or directly into a vehicle or machine.
Safety Considerations
- Always prioritize safety when working with flammable liquids. Ensure proper ventilation and take necessary precautions to avoid sparks or open flames.
- Wear protective gear, such as gloves and eye protection, during the oil transfer process.
- Consult a professional or seek advice from experienced individuals if you are unsure about any aspect of the process.
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Removing an abandoned tank
Before removing the tank, it is essential to have it inspected and emptied. If you choose not to have your tank removed, you may face problems in the future. Over time, tanks can break down, and if previous homeowners didn't appropriately abandon them, oil can leak into the soil, causing an ecological disaster in your backyard. Contaminated soil is dangerous for wildlife and humans, and oil can leach into the groundwater and surface water, causing problems for aquatic life and farmers who use ponds for irrigation.
If you are selling a house with an abandoned tank, many realtors advise their clients to ask the seller for money to remedy the situation. Often, they will also make the contract for the sale contingent on having the tank decommissioned and removed before the closing of the sale.
To find a firm that's qualified to remove oil tanks, talk to your local fire department. They issue tank-removal permits and should know which companies do good work. Then, make sure whoever you hire carries pollution-liability insurance and is OSHA-trained and certified.
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Using a drill pump
Before you begin, measure the distance between the old heating oil tank and the new tank or container. Add about 5 feet to your measurement to allow for some slack in the hose. You can use a cheap washing machine hose and a garden hose adapter for the oil tank valve, but make sure you don't get a 3/4" pipe thread adapter as it will likely leak.
Once you have your drill pump and hoses, slide the hose onto the end of the drill pump, with the arrow pointing away from the pump. Some pumps come with a piece of hose to reach down into the tank. If this is the case, attach the hose that reaches the new tank onto the other end of the drill pump. Insert the hose on the other end of the pump into the new tank.
Press the trigger of the drill to turn on the drill. The drill pump will pump the fuel into the new tank. Remove the hoses from both tanks when the old tank is drained. Remember to pump some soapy water through the pump when finished to prevent oil from contaminating the drill pump.
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Using a garden hose
Firstly, it is essential to use a pump that is rated for fuel oil transfer, as standard garden hoses may not be compatible with fuel oil and could potentially leak or fail. Some sources recommend using a cheap garden hose specifically for the discharge, with the knowledge that it will need to be disposed of afterward. A washing machine hose can also be used, but ensure it is not a 3/4" pipe thread adapter as it may leak.
When selecting a pump, a small drill-driven pump rated for fuel is a good option and can be purchased for around $70. A 12V automotive pump will also work but may be slower. For those on a budget, a $7 drill pump can be effective, but it is important to keep the run as short as possible to manage the slower flow rate. Harbor Freight offers a 12-volt DC transfer pump for around $150 that has been used successfully for pumping fuel oil.
To use the garden hose with the pump, attach it to the discharge end of the pump. On the other end of the hose, put a street 90, an adapter, and a standard suction tube from a fuel tank. Ensure that all connections are tightened properly to avoid leaks, as fuel oil can contaminate the land. As an extra precaution, consider placing the hose connection inside a 5-gallon container to catch any potential leaks.
It is important to note that fuel oil storage tanks are not pressure-rated, so if using air pressure to assist with the transfer, it must be kept very low (3 to 5 psi). Additionally, be sure to seal up any tank vents and small air leaks to prevent hazards.
By following these steps and taking the necessary precautions, it is possible to safely and effectively use a garden hose to pump fuel oil from an underground tank.
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Frequently asked questions
You can use a dipstick to measure the amount of fuel oil in your tank. Alternatively, you can use clear tubing taped to a long stick and dip it into the tank, pulling it up slowly to see if there is any fuel oil or water.
You can use a cheap 12-volt transfer pump, a diesel transfer pump, or a diaphragm pump (Sandpiper Pump). If you're looking for a more affordable option, you can get a $7 drill pump or a small drill-driven pump for around $70.
Be aware that transferring oil from your old tank to a new one may void the warranty on the new tank. To avoid this, you can use a pump to transfer the oil to an empty, clean 55-gallon drum as a backup.
Make sure to use a hose that is compatible with your pump and oil tank valve. After you're finished, pump some soapy water through the pump to prevent any issues with residual oil.











































