Rajan Wilcox
Aluminum fuel tanks are prone to corrosion and cracking, which can lead to leaks. While some temporary fixes are available, such as using epoxy or welding, the most effective way to repair an aluminum fuel tank is to replace it. However, if the tank is in a flat area, it may be possible to patch it with a piece of the same material and small sheet metal screws or pop rivets. In addition, it is crucial to address the underlying cause of the issue, such as corrosion due to moisture or design flaws, to prevent future problems.
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What You'll Learn
Using a patch of the same material with sheet metal screws or pop rivets
To repair an aluminium fuel tank, you can use a patch of the same material, along with sheet metal screws or pop rivets. Here is a step-by-step guide:
First, ensure the tank is completely empty and clean. You should remove any corrosion or residue until you reach good metal. You can use a centre punch to create a small indentation that will guide the screw and prevent it from wandering.
Next, mark the precise locations for your screws or rivets with a marker or centre punch. If using sheet metal screws, you will need to pre-drill holes. Choose a drill bit that matches the diameter of your screws. Place the tip of the drill on the marked spot and begin drilling slowly, with moderate pressure. Once the hole is drilled, remove any metal shavings and apply a cutting lubricant, such as machine oil, to the screw threads.
If using pop rivets, you will need a rivet gun to install them. Choose a rivet gun that is compatible with the size of your rivets. Ensure the rivet holes are the correct diameter to match the rivet's shank. Insert the pop rivet into the hole, and listen for a distinct "pop" sound, which indicates the rivet has been set. The mandrel should break off cleanly, leaving a secure connection.
Finally, insert your sheet metal screws into the pre-drilled holes. Use a drill with the appropriate bit driver attachment for the screw head and drive the screw into the hole at a moderate speed until it is tight and secure. Be careful not to overtighten.
By following these steps, you can effectively patch an aluminium fuel tank using a patch of the same material with sheet metal screws or pop rivets.
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Applying putty-like epoxy to seal a leaking tank
To seal a leaking aluminium tank with putty-like epoxy, you must first drain the tank and remove any corrosion. Clean the metal surface thoroughly, removing all dirt and debris. You can then apply a putty-like epoxy product such as J-B Weld WaterWeld, which can seal leaks and patch holes and cracks. This product can be kneaded with your fingers and applied directly to the affected area. After curing, the epoxy can be drilled, tapped, filed, sanded, and painted.
It is important to note that this type of repair may only be temporary, and it is recommended to replace older tanks. Additionally, when working with epoxy, always wear gloves, eye protection, and protective clothing to avoid skin and eye contact. Work outdoors or in a well-ventilated area.
Before applying the epoxy, ensure that the cartridge is at room temperature (60 to 90°F) to improve flow and make dispensing easier. The gel time for most epoxies is around 40 minutes, and it will be sandable after about 7 to 10 hours. You can also use an epoxy primer, such as etch/alodine/stronchium chromate, and then apply a coat of epoxy over the primed surface.
For added strength, consider using a product like Marine-Tex, which is a very tenacious epoxy. After applying Marine-Tex, you can epoxy or polyester a piece of fibreglass to the bottom of the tank and partway up the sides. This will provide a strong and durable repair.
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Welding a plate over the crack
Welding a crack in an aluminium fuel tank is a potentially dangerous task that should be approached with caution. Before welding, it is important to remove all fuel from the tank. This can be done by draining the tank or, if the tank cannot be drained, by filling it with water to displace the fuel.
Once the fuel has been removed, the tank should be thoroughly cleaned. This can be done using detergent, phosphoric acid, or steam. It is important to remove any corrosion or paint from the area to be welded to ensure a strong bond.
After cleaning, the tank should be purged with an inert gas such as argon to remove any remaining vapours or oxygen that could cause an explosion during welding. The tank should be filled with water to just below the repair area, and the rest of the space should be purged with the inert gas. This process should be done slowly and carefully to ensure that all oxygen and vapours are displaced.
Once the tank has been properly purged, it is safe to begin welding. TIG welding is a common method for repairing aluminium fuel tanks, as it uses less heat than a gas torch, reducing the risk of igniting any remaining fuel or vapours.
After welding, it is important to test the repair to ensure that it is safe and effective. This can be done by filling the tank with water and using a match or a "leak down tester" to check for any leaks.
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Using a fuel tank repair kit
While some sources suggest replacing an old aluminium fuel tank, there are fuel tank repair kits available that can be used to fix cracks and holes in aluminium fuel tanks. The Permatex Fuel Tank Repair Kit, for example, contains everything required to make permanent repairs to leaks in all types of metal fuel tanks. Here is a step-by-step guide to using a fuel tank repair kit:
Step 1: Vent the Tank
Remove the gas cap to vent the tank, ensuring there is adequate ventilation.
Step 2: Drain the Tank (if necessary)
If the leak is large, drain the tank or reduce the liquid level to at least 2 inches below the damaged area.
Step 3: Prepare the Damaged Area
Remove any oil, grease, tar, dirt, or other contaminants from the damaged area.
Step 4: Apply the Repair Compound
Follow the instructions provided with your specific repair kit to mix and apply the repair compound. Typically, the compound will begin to harden within 8 to 10 minutes and will fully cure in 30 minutes.
Step 5: Smooth the Repaired Area
Once the compound has cured, use a brush to smooth the repaired area. You may need to taper the edges of the repair area beyond the fiberglass for a smooth finish.
Step 6: Refill the Tank
You can refill the tank after 30 minutes or when the repair is tack-free.
It is important to note that repair kits may not be effective for all types of damage, and in some cases, it may be safer to replace the fuel tank entirely. Additionally, always ensure you are working in a well-ventilated area when repairing a fuel tank.
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Removing corrosion and using a metal epoxy
Corroded spots on an aluminium fuel tank are usually caused by sand, foam, or another substance touching the tank and holding moisture against the metal. To repair these spots, you must first remove the corrosion until you reach the good metal underneath.
Once you have removed the corrosion, you can use a metal epoxy to repair the tank. One product that can be used for this purpose is Marine-Tex Gray, which is a very tenacious epoxy. After applying the epoxy, you can epoxy or polyester a piece of fibreglass to the bottom of the tank and partway up the sides for added reinforcement. It is important to avoid using any type of foam.
Before applying the epoxy, the metal should be cleaned, etched, and washed with an alodine wash. The tank can then be primed with an epoxy primer. Zinc chromate can also be used as a primer, but epoxy primer is considered to be the best option.
While some sources recommend using epoxy to repair aluminium fuel tanks, others advise against it, suggesting that welding or replacing the tank may be a more durable solution. If the tank is 15 years or older, it is generally recommended to replace it rather than attempting a repair.
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Frequently asked questions
If your tank is leaking, it will need repairing. You can also check for corrosion and cracks.
If your tank is leaking, you should drain the fuel and remove the tank. You can then repair it using a fuel tank repair kit, which will include everything you need to make a professional-quality repair. Alternatively, you can use a putty-like epoxy, or weld a plate over the crack.
It is recommended to use a fuel tank repair kit, or a putty-like epoxy, to repair a leaking aluminium fuel tank. Welding can be dangerous and is not recommended unless you know what you are doing.
To prevent corrosion, you should ensure that your tank does not sit in moisture. You should also keep the area around the tank clean and grounded to prevent electrolisis.
A repaired aluminium fuel tank should last a long time as long as air can circulate and the tank doesn't come into contact with water. However, it is recommended to replace older tanks rather than repair them.
