Rajan Wilcox
Soldering a fuel tank can be a tricky and potentially dangerous process, as evidenced by the story of Bobby, who was attempting to solder a fuel tank and ended up being blown about 8 feet through the air by a large flame. It is important to ensure that the tank is properly cleaned and free of any residue or vapors that could ignite or explode. Some people recommend using an iron instead of an open flame for soldering fuel tanks, as it can create a better joint. Others suggest using a specific type of solder, such as lead/tin solder or silver solder, and employing techniques like swabbing the solder with de-oiled steel wool to improve adhesion. Before soldering, it is crucial to thoroughly clean the tank, and some people recommend using techniques like sandblasting, grinding, or tumbling the tank with coffee cans full of small nuts, washers, or bolts to ensure all residue is removed.
Characteristics and their values for soldering a fuel tank:
| Characteristics | Values |
|---|---|
| Preparation | Fill the tank with water to find leaks, clean the tank, and ensure no residue or smell of hydrocarbons is present. |
| Tools | Soldering iron, torch, coffee cans, muratic acid, epoxy sealer, flux, steel wool, sandblasting, fiberglass resin, body putty, solder, etc. |
| Technique | Heat the solder to its melting point, forming a putty-like consistency, then push it into the holes or seams with a rag, leather, or iron. |
| Safety | Avoid open flames near the tank, use an iron instead. Do not solder if there is residue or vapors present, as it may catch fire or explode. |
| Alternatives | Consider using a repair kit, epoxy sealer, or cutting out and replacing the damaged section instead of soldering. |
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What You'll Learn
Ensure the tank is safe to solder
When soldering a fuel tank, safety should be the top priority to prevent any potential hazards. Here are the steps to ensure the tank is safe to solder:
Firstly, it is crucial to confirm that the fuel tank is made of a solder-friendly material. Common fuels like gasoline, diesel, and kerosene are typically stored in tanks made of metals such as steel, aluminum, or brass. These metals are generally safe for soldering, but it's important to identify the specific metal to choose the right soldering techniques and tools.
Before beginning any soldering work, the fuel tank must be completely emptied and thoroughly cleaned. This step is crucial for your safety and the integrity of the solder joint. Any residual fuel or vapors inside the tank can pose a fire hazard during the soldering process. Use appropriate safety gear, such as gloves and eye protection, during this step to avoid contact with any harmful substances. Ensure the tank is well-ventilated and allow ample time for any fumes to dissipate.
After emptying and cleaning the tank, it's essential to inspect it for any damage or weaknesses. Carefully examine the tank for cracks, leaks, or signs of corrosion. If the tank shows any signs of structural compromise, it may not be safe to solder, as the heat from the soldering iron could exacerbate existing issues and create an unsafe condition.
Once you've confirmed the tank is made of a suitable material and is free from damage, it's important to take necessary precautions to prevent heat-related issues during soldering. This includes removing any components that might be affected by the heat, such as rubber hoses, plastic fittings, or any other heat-sensitive parts in the vicinity of the soldering site. Covering these components with heat-resistant shields or wet rags can provide additional protection from potential heat damage.
Finally, ensure you have a fire extinguisher nearby as a safety precaution. Soldering, especially on fuel tanks, carries a risk of fire, so having a fire extinguisher readily available is essential. Choose an appropriate type of fire extinguisher suitable for fuel and electrical fires, and ensure it is fully charged and operational before beginning your soldering work.
By following these steps and taking the necessary precautions, you can ensure that the fuel tank is safe to solder, minimizing potential hazards and creating a secure working environment.
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Clean the tank
Before soldering a fuel tank, it is crucial to ensure that the tank is thoroughly cleaned to prevent any residue from burning or causing an explosion. Here are the steps you can follow to clean the tank:
First, fill the tank with water to identify any leaks. This will help you locate areas that require repair. If there are pinholes or leaky joints, you can mark them for soldering. It is important to ensure that the tank is completely dry before proceeding to the next step.
Next, use a cleaning method suitable for the type of residue or contamination in your tank. For example, if there is old varnish or rust inside the tank, you can use a technique called “steam cleaning” to remove it. Alternatively, you can use an electrolysis tank, which is effective in cleaning up rust. If there is stubborn residue, you might need to sandblast the joints and affected areas to ensure the tank is clean. You can also try using a wire wheel to clean the outside of the tank and remove any rust or contamination.
After removing the residue, it is essential to neutralize any remaining contaminants. This can be done by swishing muratic acid inside the tank and then thoroughly rinsing it with water. Be cautious when handling acids, and ensure proper ventilation during this process.
Finally, once the tank is clean and dry, you can apply a coating to protect it. A common product used for this purpose is fiberglass resin, which can be coated on the inside of the tank to provide a protective layer. This step will help prevent future corrosion and ensure the longevity of your fuel tank.
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Choose the right solder
When it comes to choosing the right solder for soldering a fuel tank, there are several factors to consider.
Firstly, the form of the solder is important. Solder comes in various forms, including wire, paste, and bar solder. The type of project and personal preferences will determine the best form to use. For example, solder wire is commonly used for general electronics soldering and Thru Hole soldering due to its ease of use and familiarity. In contrast, solder paste may be more suitable for smaller components in SMD work as it offers greater control over the application.
Secondly, the alloy of the solder is a key consideration. Traditionally, lead-based solder was favoured due to its low melting point and excellent wetting abilities. However, due to health concerns, lead-free alloys have gained popularity, and most consumer electronics manufacturing now uses lead-free solder. When choosing an alloy, it is essential to match it with the piece being worked on. For instance, if repairing an older stereo receiver originally constructed with leaded solder, it is best to use a lead-based solder for consistency.
Thirdly, the amount of solder required and the appropriate diameter or gauge are important factors. The quantity of solder needed will depend on the size and complexity of the job. For example, a 1-pound spool of solder wire may last for years for occasional use, while a smaller 2-4 ounce spool might be more suitable for quick fixes or testing new alloys. Regarding diameter, a general-purpose diameter of 0.031 or 0.032 inches is commonly used, while larger jobs may require 0.062 inches, and intricate work may demand a smaller diameter, such as 0.020 inches.
Lastly, when soldering a fuel tank, it is essential to consider the specific requirements and characteristics of the tank. Some sources recommend using silver solder for fuel tank repairs, specifically mentioning "Harris Stay-Brite Silver Bearing Solder", which is 96% tin and 4% silver. Others suggest using soft solder, such as 50-50 or 60-40 bar solder, along with a good flux like Ruby fluid. Additionally, the use of a copper iron is recommended over a torch for better results.
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Prepare the solder
Before you begin, ensure you have the right solder for the job. For sheet metal, a special solder and flux are required. This is different from solder for electrical repairs, as it is suitable for heaping and exposing the iron plate surface. If you are soldering stainless steel, you will need silver solder, as regular plumbing solder will not work.
It is important to thoroughly clean the area you will be soldering. Drain the fuel tank and dry it. Then, pour a small amount of neutral detergent into the tank and slowly pour in tap water to wash the inside. This will remove any flammable gas inside the tank. You can also use hot soapy water and then blow it out dry. If there is any rust, remove it with a wire brush.
If you are using paste, paint it on and heat until it melts, then wipe off the excess, leaving a tinned surface. You can also use flux, which should be applied with a brush to the affected area and its surroundings. After soldering, flush the area with hot water and polish with a stainless brush to wash away any remaining flux and prevent rust.
If you are repairing a vintage motorcycle, you may need to remove the old coating film and paint by burning it off. You can do this by filling the tank with water and allowing it to stand, which will also help confirm any leaks.
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Apply the solder
When applying the solder, it is important to ensure that the fuel tank is thoroughly cleaned and free of any residue or smells of hydrocarbons. This is crucial to prevent any potential safety hazards. It is recommended to use an iron for soldering fuel tanks instead of an open flame, as it provides better results and reduces the risk of accidents.
Before applying the solder, it is essential to prepare the surface of the fuel tank properly. This involves sanding or sandblasting the joints or areas with leaks to create a clean and rough surface for the solder to adhere to. If there is rust present, it should be removed, and a rust inhibitor or primer can be applied to prevent future rusting.
Once the fuel tank is cleaned and prepared, you can begin the soldering process. Heat the fuel tank using a soldering iron or a torch, ensuring that it is heated evenly to prevent warping or damage. Apply flux to the areas that need to be soldered, as this will help the solder flow smoothly and create a strong bond.
When the fuel tank and solder are at the appropriate temperature, carefully apply the solder to the prepared areas. Use a sufficient amount of solder to fill the holes or leaks, creating a nice bead along the joints. You can use a copper iron or a torch for this process, depending on your preference and the size of the area being soldered.
It is important to work quickly and efficiently during the soldering process to avoid overheating the fuel tank or causing any damage. Once the solder has been applied, allow it to cool down gradually. You can then inspect the soldered areas for any leaks by filling the tank with water or using other testing methods.
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Frequently asked questions
Before soldering a fuel tank, ensure there is no residue in the tank. Even old varnish residue can burn or blow up. Vent the tank for an hour or so until you no longer smell gas. You can also fill the tank with water to find any leaks.
Lead-free solder does not work on fuel tanks. Use old-fashioned lead/tin solder. You can use "Harris Stay-Brite Silver Bearing Solder", which is 96% tin and 4% silver. Soft solder can also be used and kept in a putty state.
A soldering iron is a better option than an open flame. A copper soldering iron is recommended. You will also need a good flux, such as Ruby fluid.
Sandblast the outside of the tank until it is clean, then clean the rust from the inside. Swab the solder with de-oiled steel wool to break the surface tension and let the solder adhere. Angle the tank so that a puddle of solder can form.
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