
The cost of draining a fuel tank varies depending on the make and model of the car, the accessibility of the tank, the type of fuel, and the service provider. For instance, draining a diesel tank on a 2017 F-350 Powerstroke costs around $2500, whereas draining a gasoline tank on a Mazda CX-5 costs between $150 and $300. The cost also depends on whether the car has been driven and whether the fuel system needs to be flushed, with prices ranging from $300 to $500.
Characteristics and Values of Draining a Fuel Tank
| Characteristics | Values |
|---|---|
| Cost to drain gasoline from a diesel tank | $150 to $300 |
| Cost to drain diesel from a gasoline tank | $300 to $500 |
| Cost to remove, drain, and reinstall a fuel tank | $2500 |
| Cheaper alternative to draining the tank | Jump the fuel pump relay or actuate it with a scan tool and pump the fuel out |
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What You'll Learn

Cost to drain a fuel tank: $150 to $300
The cost to drain a fuel tank depends on several factors, including the type of car, the accessibility of the tank, and the service provider. If the car hasn't been driven and has gasoline in the diesel tank, you can expect to pay approximately $150 to $300 to drain the fuel tank. This cost may vary depending on the specific circumstances and the service provider.
In some cases, it may be possible to avoid removing the fuel tank by accessing it through an opening in the trunk and draining it from there. This method can be more cost-effective, with some estimates placing the price at less than $200. However, if the fuel tank needs to be removed, drained, and reinstalled, the cost can increase significantly. For example, one individual reported being quoted $2500 for this service, which they considered extremely high.
It is worth noting that the cost of draining a fuel tank also includes labour and disposal fees. Additionally, if diesel has been mistakenly added to a gasoline tank, the cost to drain the tank and flush the fuel system can be even higher, ranging from $300 to $500. Therefore, it is always advisable to get a quote from a reputable mechanic or service provider before proceeding with any work.
To minimize costs, some individuals suggest alternative methods such as siphoning the fuel or using a scan tool to jump the fuel pump relay and pump the fuel out. While these methods may be cheaper, they may not be suitable for all vehicles or situations, and it is important to exercise caution when handling fuel.
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Cost to drain and reinstall a fuel tank: $2500
The cost to drain and reinstall a fuel tank can vary depending on several factors, including the make and model of the vehicle, the severity of the issue, and the rates charged by the service provider. In some cases, the cost may be as low as a couple of hundred dollars, while in other cases, it may be significantly higher. For example, one individual shared their experience of being quoted $2500 to fix an issue with their 2017 F-350 Powerstroke after mistakenly pumping 13 gallons of gas into the fuel tank.
It is important to note that the cost of draining and reinstalling a fuel tank may primarily consist of labor charges, especially if no major parts need to be replaced. In some cases, it may be possible to avoid removing the fuel tank altogether and instead access it through an opening in the trunk to drain the incorrect fuel. This approach can help reduce costs.
Additionally, the cost of draining a fuel tank can vary depending on the type of fuel involved and whether the vehicle has been driven. For example, draining a gasoline tank that contains diesel fuel typically costs between $150 and $300 if the car hasn't been driven. On the other hand, draining a diesel tank that contains gasoline and flushing the fuel system can cost between $300 and $500.
It is always recommended to seek professional assistance when dealing with fuel system issues to ensure the problem is correctly diagnosed and addressed. While there may be DIY solutions available, they carry the risk of further complications or damage to the vehicle. Seeking a quote from a reputable dealer or mechanic is the best way to determine the cost of draining and reinstalling a fuel tank for a specific vehicle and situation.
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Siphoning and refilling diesel
The cost of draining a fuel tank varies depending on the type of car and the fuel involved. For instance, draining a diesel tank typically costs around $150 to $300, while flushing a gasoline tank and fuel system can cost between $300 and $500.
If you want to siphon and refill diesel from your vehicle, it is important to take the necessary precautions. Firstly, ensure that you have a container that is specifically designed to hold diesel fuel. This could be a jerry can or a gas can that is factory-approved to hold flammable substances. Keep in mind that some plastic containers may become brittle over time or may not be able to withstand factors like gas expansion. Always ask at a fuel station or hardware store for containers suitable for this purpose.
Additionally, make sure you have rags, water, a fire extinguisher, and a first aid kit readily available. It is also recommended that you do not attempt to siphon diesel alone, as the fumes can cause dizziness or even fainting.
When you are ready to begin, follow these steps:
- Locate the diesel tank in your vehicle. Some cars may have an opening in the trunk, while others may require you to disconnect the fuel line or use the vehicle's access point.
- Obtain a length of clear plastic tubing that is 1 inch (2.5 cm) in diameter. You will need two lengths of tubing: one long enough to reach deep into the diesel tank and a shorter length that will reach just inside the tank.
- Place the diesel container on the ground near the opening of the diesel tank.
- Insert the longer tube into the diesel tank and the shorter tube into the diesel container.
- Blow into the shorter tube to create pressure and initiate the flow of diesel.
- Once the diesel is flowing freely, gravity will do the rest of the work.
- To stop the flow, cover the long tube with your thumb, raise it above the level of diesel in the tank, and remove your thumb. Any remaining diesel in the tube should flow back into the tank.
- Remove the tubes and close the diesel tank.
Remember, diesel is highly toxic to humans, so avoid ingesting it at all costs. Rinse your mouth with water immediately if you come into contact with it, and always exercise extreme caution when handling combustible and toxic substances.
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Draining a fuel tank with an opening in the trunk
The cost of draining a fuel tank varies depending on the reason for draining and the method used. If the car hasn't been driven and has gasoline in the diesel tank, expect to pay approximately $150 to $300 for draining the fuel tank. If the car hasn't been driven and has diesel in the gasoline tank, the cost of draining the fuel tank and flushing the fuel system could range from $300 to $500.
Now, if your car has an opening in the trunk that provides access to the fuel tank, you can drain it from there. This method is generally cheaper since you don't need to remove the tank. Here's a step-by-step guide on how to do it:
- Choose a suitable location: Select an open area with ample space to contain and clean any potential fuel spills. Ensure the surface is flat and stable to prevent accidents. Check local regulations regarding fuel disposal and hazardous materials to comply with safety and environmental guidelines. Proper ventilation is crucial to prevent the buildup of harmful fumes and reduce the risk of explosions.
- Prepare the necessary tools: Depending on the method you choose, you may need a fuel siphon system, a hose, a container, a manual pump, a fuel tank adapter, and/or a fuel line. Make sure to buy a siphon system approved for combustible materials to avoid any fire hazards.
- Access the fuel tank: Open the trunk and locate the fuel tank. The fuel tank is typically a large, solid metal container on the same side of the car where you fill up the gas.
- Start the draining process: If you're using a fuel siphon system or a hose, insert it into the fuel tank and start pumping or sucking the fuel out. Place a container underneath the drainage plug to collect the fuel. If using a manual pump, connect the fuel line to the tank adapter and then to the pump. Turn on the pump, and the fuel will be forced out.
- Dispose of the drained fuel: Ensure that you dispose of the drained fuel properly and in accordance with local regulations.
- Clean up: Once the tank is drained, disconnect the fuel line, turn off the pump, and store the tools safely.
Remember, it is essential to have a basic understanding of your vehicle's fuel system before attempting to drain the fuel tank. This process can help prevent lasting damage to your car's engine, especially when you've put the wrong fuel in the tank.
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$9.89

Jump the fuel pump relay to save money
The cost of draining a fuel tank varies depending on the type of car and the fuel involved. For instance, draining a gasoline tank with diesel costs approximately $150 to $300, whereas draining a diesel tank with gasoline costs between $300 and $500. This is because removing and draining the tank is the only way to ensure that all the fuel is drained, which can be a time-consuming and costly process.
However, there is a cheaper alternative to draining a fuel tank: jumping the fuel pump relay. This method involves bypassing the fuel pump relay by connecting pins 87 and 30 on the relay with a jumper wire. This allows you to manually activate the fuel pump and pump out the fuel without needing to remove the tank.
Jumping the fuel pump relay can be a quick and effective way to save money when draining a fuel tank. It only requires a few tools and can be done in a few simple steps. First, locate the fuel pump relay, which is usually found in the fuse box or behind a wooden floorboard in the passenger footwell. Then, using a schematic of the relay, orient a jumper lead to connect pins 87 and 30. This will activate the fuel pump, allowing you to pump out the fuel.
It is important to note that jumping the fuel pump relay is a temporary solution and may not work for all vehicles. Additionally, if the fuse blows when attempting to jump the relay, it could indicate a short circuit between the relay and the fuel pump, or a faulty pump. In such cases, it is recommended to consult a professional mechanic or seek advice from a reputable online source.
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Frequently asked questions
Removing, draining, and reinstalling a fuel tank can cost upwards of $2500.
Draining a fuel tank without reinstalling it can cost between $150 and $500 depending on the type of car and the service provider.
Draining a fuel tank yourself can be done for the cost of a 12-volt fuel pump or for free with a clear hose.
Draining only some fuel from a tank can be done for free by siphoning the fuel out.











































