Regan Brown
Rust in a diesel fuel tank can be a challenging task to fix, especially if it's your first time. It is important to understand that rust not only affects the aesthetics of your Mercedes but can also cause fuel contamination, clog filters, and lead to expensive repairs. Before attempting to remove rust, it is crucial to inspect the tank to determine the severity of the corrosion. If the rust has caused structural issues or if the tank is too damaged, replacing it might be a more viable option. However, if rust removal is preferred, there are several methods you can explore, such as using commercial rust removers, electrolysis, or 'the chain shake' technique. Safety should always be a priority, so ensure you wear protective gear and work in a well-ventilated area.
| Characteristics | Values |
|---|---|
| Step 1 | Empty the tank of any residual fuel and dry it out thoroughly. |
| Step 2 | Use a rust remover. Pour the rust remover into the tank, seal it up, and shake it vigorously. |
| Step 3 | Let the remover sit as per the manufacturer's instructions before draining it out. |
| Alternative Steps | Fill the tank with a liquid solution of baking soda and water, then use a battery charger to create an electrical current that will dissolve the rust. |
| Place a chain into the diesel fuel tank and shake it vigorously. | |
| Wash the tank with a degreaser, then rinse it out. | |
| Seal up all openings except for the fuel fill. Pour in enough muriatic acid to slosh around, then tip and roll the tank. | |
| Step 4 | Neutralize the acid with a base (baking soda) and flush the tank with warm water. |
| Step 5 | Apply a mist or fog of WD40 to keep the tank from flash rusting. |
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What You'll Learn
- Prepare the tank by emptying it of fuel and drying it out
- Use a rust removal method such as a commercial remover, electrolysis, or a chain shake
- Neutralise acid with a base like baking soda and rinse with warm water
- Seal the cleaned surface to prevent future rusting
- Reinstall the tank and reconnect fuel lines and battery
Prepare the tank by emptying it of fuel and drying it out
To prepare your Mercedes diesel fuel tank for rust removal, start by disconnecting the battery to reduce the risk of sparks that could potentially ignite fuel vapors. Next, relieve the fuel system pressure, following the instructions in your vehicle's manual. Now, you can begin to drain the fuel storage tank. Remember to have a bucket ready to safely collect the drained fuel. If the fuel is old or rancid, dispose of it safely; otherwise, preserve it in a gas can or an appropriate fuel container.
After you've drained the fuel, you can begin to disconnect the fuel storage tank. This usually involves locating the fuel line connecting the tank to the fuel injectors or the carburetor. On most models, the fuel line is made of rubber and secured with clamps. Loosen the fuel line clamps with pliers, then pull them off. If your bike has a petcock, set it to OFF; otherwise, verify that the ignition and fuel pump are fully switched off. On bikes equipped with a petcock, set it back to ON to let the fuel out of the tank. Alternatively, use a siphon pump to drain the tank.
Once the tank is empty, you can dry it out by simply leaving it in the sun for a few hours. It is important to ensure that the tank is thoroughly dried out before proceeding with the next steps of the rust removal process.
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Use a rust removal method such as a commercial remover, electrolysis, or a chain shake
It is important to understand how rust can harm your vehicle's performance. Rust is a major cause of fuel contamination and can clog filters, causing your engine to run poorly or not at all. If you have a farm fuel storage tank, for example, rust infiltration can lead to costly repairs or even the need for a complete replacement.
To remove rust from your Mercedes diesel fuel tank, you can use a commercial rust remover, electrolysis, or a chain shake. Here's how you can do it:
Commercial Rust Remover:
First, drain the fuel storage tank by relieving the fuel system pressure. Check your Mercedes manual for specific instructions on this. Then, disconnect the battery to reduce the risk of sparks that could ignite fuel vapors. Next, use a pump to remove the remaining fuel and have a bucket ready to safely collect it. Once the tank is empty, you can start the rust removal process using a commercial rust remover. Follow the instructions on the product you choose, and ensure you have the necessary safety gear, such as gloves and eye protection. After removing the rust, seal the tank to prevent future rusting.
Electrolysis:
Electrolysis is a safe method to remove rust from your fuel tank. You will need a bike or car battery, clamps, a piece of steel round bar as a sacrificial anode, a plastic spray paint can lid (modified to hold the anode in position without touching the tank), hot water, and sodium carbonate (sold as a "pH increaser" for swimming pools). Create a solution by mixing about a cup of sodium carbonate with five gallons of hot water. You may need to adjust the amounts based on the size of your tank. Submerge the steel anode in the solution and connect it to the negative terminal of the battery. Connect a clamp to the positive terminal and clip it to the fuel tank. Let the setup work for some time, and you may need to do this process multiple times depending on the amount of rust. Finally, rinse the tank thoroughly with water.
Chain Shake:
The chain shake method involves using physical force to remove rust from your fuel tank. Start by removing any loose flakes of rust, then fill the tank with nuts, bolts, or stones and seal the openings. Shake the tank vigorously for several minutes, allowing the chains to scrub away the rust. After the shaking process, inspect the tank carefully with a flashlight to ensure no rust remains. If you find any lingering rust, repeat the process until the tank is completely clean. Once you're satisfied, dry the tank completely before sealing it to prevent future rust.
Remember, always prioritize safety when working on your vehicle. Consult a professional if you're unsure about any steps or procedures.
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Neutralise acid with a base like baking soda and rinse with warm water
Removing rust from a diesel fuel tank is a challenging task that requires proper safety gear and equipment. Before attempting to remove rust, it is important to understand the potential harm it can cause to your vehicle's performance. Rust can clog filters, leading to poor engine performance or even complete failure.
Step 1: Empty and Dry the Tank
Start by emptying the diesel fuel tank of any residual fuel. This can be done using a pump to drain the fuel into a bucket. Ensure that the tank is thoroughly dried out, which can be achieved by leaving it in the sun for a few hours.
Step 2: Prepare the Acid Solution
Muriatic acid, diluted with water, is often used to remove rust. However, it is essential to wear proper safety gear, including gloves, eye protection, and a cartridge-type charcoal respirator, as these acids produce strong odours and fumes. The water-to-acid ratio may vary depending on the desired strength, but it is crucial to follow safe acid disposal practices.
Step 3: Apply the Acid Solution
Seal all openings of the fuel tank except for the fuel fill. Pour in enough of the diluted muriatic acid solution to allow for sloshing and movement. Tip and roll the tank to ensure the acid reaches all interior surfaces. Check through the filler periodically, and add more acid if needed.
Step 4: Neutralize with Baking Soda
Once you are satisfied with the level of derusting, it is time to neutralize the acid. Add baking soda to the tank and fill it with warm water. The baking soda will react with the remaining acid, preventing damage to the metal inside. The exact amount of baking soda required may vary, but it is important to ensure a thorough reaction.
Step 5: Rinse and Dry
After neutralization, rinse the tank with clean warm water to remove any remaining acid residue, baking soda, and rust particles. Drain the tank and repeat the rinsing process to ensure a thorough cleaning. Finally, dry the tank completely, using an air hose or a heat gun to remove all moisture.
Step 6: Seal and Prevent Flash Rusting
Apply a suitable sealant to the cleaned and dried surface to prevent future rusting. If you plan to use Red-Kote, you can proceed with this step. Otherwise, you can use a product like WD40 to prevent flash rusting until you are ready to apply a different coating.
Please note that this process should be done in a well-ventilated area or outdoors due to the strong odours and fumes produced. Additionally, always consult a professional if you are unsure about any steps or safety precautions.
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Seal the cleaned surface to prevent future rusting
Once you have removed the rust from your Mercedes diesel fuel tank, you will need to seal the cleaned surface to prevent future rusting.
Firstly, ensure that the tank is completely dry. This can be done by simply leaving it in the sun for a few hours. You can also use a product like KBS Klean to clean the tank. KBS Klean is mixed with warm water and allowed to soak. The tank is rotated at intervals to ensure all surfaces are covered. The tank is then rinsed thoroughly with water.
Next, you will need to apply a sealant. Sealants provide a protective layer, preventing future rusting. There are a variety of sealants available, including KBS Coatings, Red-Kote, and POR-15. Red-Kote, for example, requires you to plug any holes with rubber plugs, corks, or masking tape. You then pour in enough Red-Kote to coat the entire tank, reinstall the gas cap, and rotate the tank to ensure even coverage.
After applying the sealant, you will need to allow the tank to air-dry in a well-ventilated area. This process can take up to 96 hours for maximum cure.
In addition to sealants, there are other methods to prevent future rusting. One way is to keep the fuel tank full so that the metal is not exposed to the air. This reduces the amount of condensation that can occur, preventing water and oxygen from combining with the metal and creating rust. Another method is to use a product like 2-stroke oil or Sta-bil marine formula to prevent future rust.
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Reinstall the tank and reconnect fuel lines and battery
Once you have cleaned or replaced your fuel tank, you can begin the process of reinstallation. First, hook up your supply hose to the tank. Next, hook up your return and vapour line hoses to the tank. Bolt the metal panel back in, and install your new fuel sending unit. Now, reinstall the tank into the truck, ensuring that the gaskets you installed do not come off.
After you have reinstalled the tank, you can reconnect the fuel lines. Start with the main fuel feed line. It has a metal fitting on one end that screws into the tank. Screw this in, and cut the hose short enough to avoid touching any other parts, but long enough to make a graceful bend to the fuel line it attaches to. Now, reconnect the fuel lines in the engine compartment. Fill the tank with several gallons of clean, fresh diesel, prime the fuel filters, and start the car.
Finally, check for leaks. Go for a drive, and check for leaks again.
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Frequently asked questions
First, empty the tank of any residual fuel and dry it out thoroughly. Next, use a rust remover. Simply pour the rust remover into the tank, seal it up, and shake it vigorously. Let the remover sit for a while before draining it out.
The fuel filler neck is mounted just above the rear wheel. To access it, you can simply unscrew the access hatch under the rear seat.
If the access hatch is broken or bonded to the fuel tank, you will need to remove the fuel tank. This involves removing the exhaust system, disconnecting the brake lines, and dropping the rear beam.
Rust is caused by moisture becoming trapped in the tank. To prevent this, regularly clear the fuel lines by blowing through them with the filler cap removed. You can also put a large fuel filter in the fuel supply line close to the tank.
If the tank is severely rusted, it may be better to replace it.
