
Draining a fuel tank can be a tricky process, and there are several methods to do so. One common method is siphoning the fuel into another container, although this can be difficult due to blocks or sharp corners in the tank that prevent a hose from being inserted. Another method is to drop the tank and drain, flush, and drain again. This can be labour-intensive, so an alternative is to use a vacuum pump through the filler neck. This guide will explore the various ways to drain a Ram 3500 fuel tank and provide step-by-step instructions for each method.
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What You'll Learn

Use a vacuum pump through the filler neck
To drain your RAM 3500 fuel tank using a vacuum pump through the filler neck, follow these steps:
First, locate the filler neck and remove the fuel cap. Place a funnel in the filler neck to hold the flap open. This will provide access to the fuel tank. Ensure that you have the correct tools and safety equipment before proceeding, such as gloves and eye protection.
Next, insert a vacuum pump into the filler neck. A vacuum pump is a device that uses suction to remove liquids or gases from a container. In this case, the vacuum pump will be used to extract the fuel from the tank. Connect the vacuum pump to a power source, such as a battery, and turn it on.
Allow the vacuum pump to run until the fuel tank is empty. This may take some time, depending on the size of the tank and the power of the vacuum pump. Monitor the process closely to ensure that the pump is working effectively and that no fuel is spilled.
Once the tank is empty, turn off the vacuum pump and carefully remove it from the filler neck. Clean any fuel residue or spills with appropriate materials, such as absorbent cloths or rags.
Finally, reinstall the fuel cap securely on the filler neck. Ensure that all tools and equipment are properly stored or disposed of, and wash your hands and any exposed skin that may have come into contact with fuel.
Draining a fuel tank using a vacuum pump requires caution and attention to safety protocols. It is important to work carefully and avoid any potential hazards, such as sparks or open flames, when dealing with flammable liquids like fuel. Always refer to the vehicle's manual or seek professional advice if you are unsure about any steps or procedures.
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Remove the bed and fuel tank hose
To remove the bed and fuel tank hose, you will need to follow these steps:
First, disconnect the fuel fill hose and vent hose. You will need to remove the screws under the fuel lid that hold it to the bed and pull it out. Depending on your model, you may also need to disconnect the tail lamp wire harness and any ground straps.
Next, you will need to remove the cargo box bolts. If you have a short cargo box, simply remove the cargo box bolts. If you have a long cargo box, you may need to slide the bed back to access the bolts.
Once the bolts are removed, you can lift or slide the bed off the truck. It is recommended to have an extra set of hands or use a come-a-long to help with this step as the bed can be heavy.
With the bed removed, you will now have access to the fuel tank and hose. Depending on your model, you may need to lower the tank slightly to access the fuel tank hose. This can be done by using motorcycle jacks to lower the tank enough to disconnect the flex lines.
Finally, disconnect the fuel tank hose from the tank. Be sure to have a container ready to catch any remaining fuel in the hose.
It is important to note that this process may vary slightly depending on the year and model of your RAM 3500. Always refer to your owner's manual or seek advice from a qualified mechanic if you are unsure about any steps.
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Drain via the fuel lines
Draining a fuel tank via the fuel lines is a viable option if you don't want to deal with the mess and hassle of dropping the tank. This method is also known as "siphoning." Here is a step-by-step guide on how to drain your RAM 3500 fuel tank via the fuel lines:
Step 1: Prepare the Work Area
Start by thoroughly cleaning the area around the fuel fill fitting and the rubber fuel fill hose at the tank. This will help ensure that you don't accidentally contaminate the fuel or cause any additional issues.
Step 2: Access the Fuel Tank
The next step is to access the fuel tank. If your vehicle has four doors and a short bed, you will need to remove the left-rear tire/wheel to gain access to the tank.
Step 3: Disconnect the Fuel Hose
Once you have access to the fuel tank, locate the rubber fuel fill hose at the tank fitting. Loosen the clamp that secures the hose in place and carefully disconnect it from the tank. Be prepared to catch any fuel that may spill from the hose or tank.
Step 4: Set Up a Collection Container
Have an approved diesel fuel holding tank ready to collect the drained fuel. Place it at a lower level than the fuel tank to allow for easy draining. You can use a funnel to direct the fuel into the container if needed.
Step 5: Start the Siphoning Process
With the collection container in place, carefully insert a siphon hose into the fuel tank through the disconnected fuel hose. You may need to use a screwdriver to hold open any flaps or valves that may be blocking the hose's path, as some tanks have anti-siphoning measures in place.
Step 6: Activate the Fuel Pump (Optional)
If your vehicle has a fuel pump, you can activate it to assist with the draining process. Refer to your vehicle's manual for specific instructions on how to do this. This step may not be necessary if the siphoning process is effective on its own.
Step 7: Monitor the Draining Process
Keep a close eye on the draining process to ensure that the fuel is being collected safely and effectively. Be prepared to adjust the siphon hose or collection container as needed.
Step 8: Re-attach the Fuel Hose
Once the tank is empty, carefully re-attach the rubber fuel fill hose to the tank fitting and tighten the clamp to secure it in place. Make sure that all connections are secure and that there are no leaks.
Step 9: Dispose of the Drained Fuel Properly
Finally, dispose of the drained fuel at an appropriate facility or recycling center. Do not pour it down the drain or into the environment, as it can cause pollution and harm to wildlife.
Draining your RAM 3500 fuel tank via the fuel lines is a feasible option, but it may be more time-consuming and challenging than dropping the tank. Ensure you take the necessary precautions and refer to your vehicle's manual for specific instructions related to your model.
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Disconnect the low-pressure fuel line
Disconnecting the low-pressure fuel line is a crucial step in draining a diesel tank. It is important to act quickly and not start the vehicle if you have accidentally put DEF in your diesel tank.
Firstly, locate the low-pressure fuel line at the front of the vehicle. This is where you will need to disconnect the fuel line. Ensure you have the necessary tools and safety equipment before proceeding. Place the vehicle in a well-ventilated area and wear protective gear, including gloves and eye protection.
Once you have located the low-pressure fuel line, carefully disconnect it. This process may vary depending on the specific model of your RAM 3500, but it typically involves loosening and removing the relevant clamps or connectors. Be cautious, as fuel may spill or leak during this process. Have an approved diesel fuel holding tank ready to catch any drained fuel.
After successfully disconnecting the low-pressure fuel line, you can activate the lift pump using a scan tool. This will help draw out the DEF-contaminated diesel fuel. Ensure that you dispose of the drained fuel appropriately, following local regulations and guidelines for hazardous waste disposal.
It is important to note that disconnecting the low-pressure fuel line is a complex task and should only be attempted by those with the necessary knowledge and experience. If you are unsure about any part of the process, it is always best to consult a professional mechanic or seek advice from a trusted source.
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Siphon the fuel
To siphon the fuel from your RAM 3500, you will need to locate the fuel filler neck and remove the fuel filler cap. This will give you access to the fuel tank.
Before you begin siphoning, it is important to thoroughly clean the area around the fuel filler neck and the rubber fuel fill hose at the tank. This will help to prevent any dirt or debris from entering the tank during the siphoning process.
Once the area is clean, you can attempt to insert a siphon hose into the fuel filler neck. Some vehicles may have a screen or protection in place that prevents the hose from reaching the fuel tank. In this case, you may need to remove the fuel filler neck and insert the hose directly into the short rubber hose coming out of the tank. Alternatively, you can try to feed the hose through the fuel filter, as suggested by some forum users.
If you are still unable to reach the fuel with the hose, you may need to remove the bed of your truck or slide it back to access the top of the tank. From there, you can remove the fuel sending unit/pump combo and siphon the fuel through that opening.
It is important to use an approved diesel fuel holding tank to collect the drained fuel. Once the tank is drained, you can refill it with fresh diesel fuel and restart your vehicle.
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