Katerina Swanson
There are several ways to determine whether a tank is empty, depending on the type of tank and the context. For example, if the fuel gauge is not working in a car, one option is to drain or pump the tank, although this may not be feasible or desirable. Another option is to fill the tank and drive until it is about a quarter full, which would ensure that the fuel level is well below the fuel sender openings. In boats, it is important to check for water in the fuel tank, as this can lead to poor engine performance and damage over time. This can be done by using a wooden dowel with water-finding paste applied to it or by inspecting the fuel directly after ensuring there are no sources of ignition nearby.
Characteristics and Values
| Characteristics | Values |
|---|---|
| Fuel gauge not working | Knock on the tank or use a wooden broom handle down the fuel filler hole |
| Fuel gauge working | Check the gauge |
| Boat fuel tank | Apply water-finding paste to a wooden dowel and insert it into the tank to check for water |
| Boat fuel tank alternative | Drain fuel into a glass jar and leave it to settle for half an hour to check for water |
| Boat fuel tank disposal | Take the tank to a hazardous waste disposal site |
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$64.2 $71.01
What You'll Learn
Check for water in the fuel tank
Water is one of the most common fuel contaminants, and it can cause serious damage to fuel tanks and systems. Water may enter tanks due to spillage, condensation, or as a vapour that can be absorbed by the fuel. The presence of water in a fuel tank can have dangerous and costly consequences, so it's important to perform regular tank maintenance and fuel testing.
- One of the quickest and easiest ways to check for water is to use a water-detecting paste, such as Kolor Kut or SAR-GEL® Blue Water Finding Paste. Apply the paste to a wooden stick or gauge stick and insert it to the bottom of the fuel tank. Remove the stick and observe if the paste has changed colour, indicating the presence of water.
- If your fuel tank is portable, you can take it to a professional facility that offers fuel and oil disposal services or hazardous waste disposal. They may be able to test for water contamination.
- For boat fuel tanks, disconnect the line running from the fuel tank at the fuel filter and drain some fuel into a clean glass jar. Leave the fuel to sit for about 30 minutes to allow any water to settle. If there is water in the fuel, it will form a clear bubble or layer at the bottom of the jar due to its higher density.
- Some fuel filters are available with a water-sensing alarm feature, which can help alert you to the presence of water in the fuel tank.
- An experienced mechanic may be able to spot water contamination and the presence of microbes by the look and smell of the fuel. Water-contaminated fuel often appears darker than normal and may have a foul smell.
To prevent water contamination in your fuel tank:
- Use ethanol-free gas if possible, as ethanol attracts and absorbs water molecules.
- Consume the fuel and avoid leaving it in the tank for extended periods.
- Fill your tank with enough fuel for your next trip and refill it frequently to keep the fuel fresh.
- Use fuel stabilizers to reduce the water absorption rate of ethanol.
- Regularly inspect, clean, or replace your fuel filters.
- Winterize your fuel tank by filling it to capacity to prevent condensation from forming inside the tank during storage.
- Keep your fuel tank clean and check it periodically for water and sediment.
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Use a fuel gauge
Using a fuel gauge is the most common way to tell how much fuel is left in a tank. However, there are instances when the gauge malfunctions and does not give an accurate reading. For instance, the gauge might show a full tank even when you've driven for miles. This could be due to a power surge or a short circuit in the system.
To check if the issue is with the fuse, locate your car's fuse box and find the fuse that corresponds to the fuel gauge. You can use a fuse tester or a multimeter to see if the fuse is blown. If it is, replace it with a new fuse of the same amperage.
If the fuse is not the issue, the next step is to check either the fuel sending unit or the fuel gauge itself. Before checking, take a good look at your vehicle. Depending on the make and model of your car, it may be easier to access one over the other. For example, the fuel sending unit in a fifth-generation Honda Civic is located in the trunk behind a panel, whereas accessing the fuel sending unit on a third-generation Chevy Camaro requires dropping the gas tank.
If you suspect the issue lies with the fuel gauge, remove it from the dashboard and test it with a multimeter or an external power source. If the gauge does not respond or shows an incorrect reading, it will need to be replaced.
In addition to the methods above, there are other ways to troubleshoot a faulty fuel gauge. One option is to check the voltage at the fuel gauge by pulling the instrument cluster out of the dash using the steps in your repair manual. Set the multimeter to 20V DC and test the wiring going to the gauge. If the voltage is good, the gauge is faulty and will need to be replaced. If the voltage is low, complete further diagnosis to determine if there is a wiring issue.
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Listen for unusual engine sounds
Unusual engine sounds can indicate a problem with your fuel pump, which moves fuel from the tank to the engine. If your fuel pump is malfunctioning, it may not be able to get enough gas from the tank to the engine, causing the engine to stutter or surge.
A fuel pump in good condition should make a low humming sound. If you hear unusual noises such as whining, buzzing, droning, or sputtering, this could indicate a problem with the pump, fuel, or related parts. A whining noise, for example, could mean that your fuel pump is damaged, contaminated, or low on fuel. If the pump is unable to draw fuel from the tank, the engine will be harder to start and will stutter while driving.
If you hear unusual engine sounds, it is important to get your car looked at as soon as possible. Driving with a malfunctioning fuel pump can cause costly damage to your engine. Regular maintenance and keeping your gas tank at least a quarter full can help extend the life of your pump.
It is worth noting that unusual engine sounds are not always indicative of a fuel pump issue. Other factors, such as electrical issues, a faulty battery, alternator, starter, or fuel filter, could also be the cause. If you suspect a problem, it is always best to consult a mechanic for a proper diagnosis.
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Check the fuel tank valves
Checking the fuel tank valves is an important step in diagnosing fuel-related issues. Fuel check valves are installed in fuel lines and play a crucial role in controlling the flow of fuel and maintaining the necessary pressure. Here are some detailed instructions on how to check the fuel tank valves:
First, locate the fuel check valve. In some vehicles, like boats and Jeep Cherokees, the fuel check valve may be hidden at the inlet of the filter housing. It is often referred to as a "ball check valve" and can be identified by a plastic screw on top of the housing.
Once you have located the fuel check valve, inspect it for any signs of clogging or debris accumulation. Remove the valve and check for any obstructions that may be preventing the valve from functioning properly. This could include dirt, grime, or other particles that have built up over time.
If you suspect that the valve is clogged, carefully clean it or replace it with a new one. Make sure to refer to the vehicle's manual or seek professional assistance if you are unsure about the process.
To test the functionality of the fuel check valve, you can perform a pressure test. Use a fuel pressure gauge to monitor the fuel pressure. A quick loss of pressure may indicate a defective check valve in the filter or regulator, while a slow loss of pressure could suggest an issue with the check valve in the electric fuel pump.
Additionally, consider inspecting the return line from the injectors to the tank. Ensure that it is properly connected and does not allow air to enter the system. A check valve in this line can help prevent air from entering and causing fuel starvation issues.
Finally, pay attention to any unusual engine behaviour. If the engine stumbles or has a lumpy idle, it could be an indication of a fuel pump or check valve issue.
By following these steps and regularly checking the fuel tank valves, you can help ensure the proper functioning of your vehicle's fuel system and prevent potential fuel-related problems.
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Pump out the fuel
Pumping out the fuel from a tank requires some equipment and a certain level of caution. The first step is to obtain a suitable pump, with options including a 12v DC Bravex fuel pump from Amazon, a 75 GPH fuel pump from O'Reilly Auto Parts, or a C-TEK charger set to "supply" mode.
Once you have acquired the pump, you can proceed with the following steps:
- Prepare the pump and power source: Ensure the pump is connected to a power source, such as a standard 12v trailer battery.
- Choose a suitable container: Utilize a fuel jug or gas cans to collect the fuel. Opt for clear containers with litre/gallon markings to easily monitor the fuel level.
- Disconnect the fuel sending unit (if accessible): If possible, remove the fuel sending unit on the top of the tank and pump the fuel out from there.
- Use a hose for hard-to-reach areas: If you can't access the fuel sending unit, consider using a hose. Disconnect the outlet of the fuel primer bulb from the outboard motor and attach a long hose to the bulb's outlet, running it into the container.
- Start pumping: Turn on the pump and stay nearby to monitor the process. Turn off the pump when the fuel flow drops to avoid issues like pump cavitation.
- Flush the tank (optional): After the tank seems empty, run a couple of gallons of fresh fuel through it to flush out any remaining water or sediment.
It is important to be cautious when handling fuel and to dispose of it properly. Some hazardous waste facilities accept fuel disposal for free, while others may charge a fee. Additionally, you can offer free fuel to interested individuals through platforms like Craigslist.
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Frequently asked questions
If your fuel gauge is not working, you can try pumping out the gas or running your car until the tank is empty.
Before checking your boat's fuel, ensure you are in a well-ventilated area with no naked flames. Disconnect the line running from the fuel tank at the fuel filter and drain out some fuel into a clean glass jar. Leave the fuel to sit for half an hour to allow any water to settle.
Winterizing your fuel tank can help prevent condensation from forming inside. Fill the tank to capacity when storing your boat to leave no room for condensation. Additionally, you can use fuel stabilizers to reduce the water absorption rate.
Water mixing with your boat's fuel can lead to poor engine performance and, if left unattended, can cause damage to the engine. Water can also clog carburetors and fuel injectors and cause phase separation, which will need to be removed.
