
Water in the fuel tank of your car or bike can be damaging to your vehicle. Water can enter your vehicle's fuel tank in numerous ways, and its presence can cause ignition problems, sudden halts, and juddering when accelerating. If you notice any of these issues, it is necessary to get rid of the water. The extent of the water in the fuel tank will determine the optimal solution, which can include changing the fuel filter, adding additives to the fuel tank, or draining the fuel tank to clean it. However, these solutions require expertise, so it is important to speak to a trusted mechanic or seek professional help.
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What You'll Learn

Drain the tank, clean it, and refill with good-quality fuel
To get water out of your fuel tank, you must first drain the tank. This can be done by using a syphon pump, which will allow you to drain the tank of its contents, including the water. If you have a boat, you can hire a fuel filtration specialist who will be able to suck out the water and any other dirt or debris in your tank.
Once the tank is drained, you can begin cleaning it. One method is to use a pressure washer to lift any loose material, and then use cleaning vinegar or evaporust to remove any remaining residue. Alternatively, you can use a mixture of paint thinner with nuts and bolts, shaking the tank to loosen debris, and then drain it.
After cleaning, the tank should be dried thoroughly. Then, you can refill the tank with good-quality fuel. It is recommended to also replace the fuel filter at this stage to ensure the tank and engine run smoothly.
It is important to identify the source of the moisture to prevent future issues. Condensation can be a common cause of water in fuel tanks, so keeping the tank full can help to prevent this issue. Additionally, using fuel treatments can help to maintain the health and performance of your vehicle by clearing out gunk, lubricating the engine, boosting performance, and stabilising fuel during storage.
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Use a fuel filtration service to suck out the water
If you have water in your fuel tank, you can hire a fuel filtration service to come out to your boat and remove the water. They will put a tube in where your sender (gauge) is and suck out the gas, getting to the corners of your tank as well. The gas will then go into their filter and be returned to the boat in the fill-up opening. This method will also remove any dirt or debris from your tank.
This process is known as fuel polishing, and it is a service offered by companies such as Total Energy Solutions. Fuel polishing systems tackle and remove even the smallest impurities from your fuel, ensuring it meets or exceeds industry standards for cleanliness. These systems can also rejuvenate your fuel, maintaining its quality as close to new as possible.
Fuel filtration services can also be used to remove water from diesel fuel storage tanks. Companies such as Curtis Power Solutions offer fuel testing and treatment services to remove water and sediment from diesel fuel tanks, as well as fuel quality tests to check for contamination. They also offer fuel top-off services to keep your tank full and reduce condensation that forms on tank surfaces due to temperature changes.
If you are unable to hire a fuel filtration service, there are other ways to remove water from your fuel tank. One method is to use a syphon pump to drain the gas from your tank. You can also try to separate the water from the fuel and then use the fuel a little at a time in your car or lawnmower. However, it is important to note that fuel today often contains alcohol, which can bond with water and affect engine performance.
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Separate the water and use the fuel a little at a time
If you're looking to separate water from fuel in a tank, there are several methods you can try. One option is to use a pump to remove the fuel and water mixture from the tank and then let the water settle at the bottom of a separate container before carefully pouring the fuel back into the tank. You can also use a water separator funnel, which will only allow fuel to pass through while blocking the water. This method is effective but may be slow for large volumes of fuel.
Another approach is to hire a fuel filtration specialist. They will insert a tube into the tank and suck out the fuel, filtering it and returning it to the tank while removing any water and debris. This method ensures professional results but may be more expensive.
If you're not concerned about saving the fuel, you can simply separate the water and dispose of the fuel. However, if you want to use the fuel, it's important to do so cautiously. Add small amounts of the fuel to your car's tank when it's already almost full, or use it in a lawnmower or another engine you don't care about. By mixing the potentially contaminated fuel with fresh fuel, you reduce the risk of issues caused by any remaining water or residue.
To prevent future water contamination, keep your fuel tanks as full as possible, as this leaves less room for condensation or other sources of moisture. Additionally, identify and address the source of the moisture to prevent a recurrence.
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Use the HydrX Fuel Conditioning System to continuously remove water
The HydrX Fuel Conditioning System is an innovative system that polishes fuel and continuously removes water from diesel storage tanks to prevent corrosion. Corrosion within a fueling system can affect fuel quality and impact the integrity of equipment. Water contamination is the chief enemy of diesel storage, and stagnant water on tank bottoms is the breeding ground for microbial activity, which leads to the production of corrosive acids and microbial waste.
The HydrX Fuel Conditioning System is designed to remove water from the lowest point in the tank, preventing water from stagnating on the tank bottom and breeding microbial contaminants. The system incorporates proprietary water and particulate removal technology, providing best-in-class protection of the fuel and fueling equipment. It also has integrated filtration that removes entrained water, rust, sand, and microbial particulate from the fuel, polishing it before returning clean fuel back to the tank.
The HydrX Fuel Conditioner is offered in two models: the HydrX 250D and the HydrX 500D. Each model includes two automatic solenoid valves that control the flow of water removed from the bottom of the diesel storage tank and the flow of clean fuel returned to the tank. The HydrX 250D has a 2.5-gallon capacity and a height of 23 inches, while the HydrX 500D has a 5-gallon capacity and a height of 30 inches. The HydrX Software Feature Enhancement allows for full system control and remote access to settings, system status, reporting, and alarms through the Web UI.
The HydrX Fuel Conditioning System operates in multiple modes: Vacuum mode, Sweep mode, and Polishing mode. Vacuum mode uses suction from the STP port to pull fuel, water, and particulate into the fuel conditioning system. Sweep mode uses clean fuel to push water and particulate to the lowest point in the tank, where it can be extracted using vacuum mode. Polishing mode is activated when the vacuum and sweep modes are complete, providing a fine polish for optimal fuel quality.
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$34.95

Change the fuel filter, add additives, or drain the tank
Water in the fuel tank is a common problem faced by vehicle owners, especially in boats. If the quantity of water inside the fuel tank is high, then it can cause issues related to the engine, lubrication, and rusting. If you notice continuous problems with ignition, acceleration, and sudden stoppage, you should get your vehicle checked for water in the fuel tank.
One solution is to change the fuel filter. A fuel filter acts as a barrier, preventing water from entering the vehicle's engine from the fuel tank. However, the filter can lose efficiency if water gets stuck inside it. Replacing the old fuel filter with a new one can help solve this problem. Fuel water filters are available on Amazon for a low cost.
Another option is to add additives to the fuel tank. Wood alcohol or methanol-based additives work great to absorb any remaining water in the tank. A high alcohol additive will clear out the water, but it will also suck it up into the fuel, which is not ideal in the mid to long term unless you plan to burn the fuel immediately. It is important to note that ethanol will not clear out the water. Fuel stabilizers can also be added to the first few tank fill-ups.
Finally, you can choose to drain the tank. This involves removing the fuel level sender and sucking out the water from the bottom of the tank with a tube or hose. You can do this yourself or hire a fuel filtration specialist to come to your boat and perform this service. After draining the water, you should clean the tank and refuel it with good-quality fuel. This can be an expensive procedure but can offer better results.
It is important to note that all these procedures require expertise. If you are not well-versed in vehicles, it is recommended to speak to a trusted mechanic and make an informed choice regarding the best solution.
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Frequently asked questions
You can check the fuel colour—water will make the fuel look darker. It may also cause a foul smell or microbial growth. You can also use a dip-stick laced with water-finding paste to detect water in the tank.
You can change the fuel filter, add additives to the fuel tank, or drain the fuel tank to clean it. However, these methods require expertise, so it is best to speak to a trusted mechanic or seek professional help.
Water in the fuel tank can cause ignition problems, sudden halts, and acceleration issues. It can also lead to microbial growth and corrosion, which can damage the vehicle.











































