Mercedes Mullins
Fuel tank corrosion is a common issue that can lead to costly repairs if not addressed promptly. The presence of rust particles or debris in the fuel is a tell-tale sign of a corroded fuel tank. Before attempting any cleaning or restoration methods, it is crucial to thoroughly inspect the tank to determine the severity of the corrosion. This involves checking for deep dents, large cracks, or significant structural damage. If the tank is severely damaged, replacement may be the only viable option. However, for minor to moderate corrosion, several cleaning methods can be employed to restore the tank's functionality. These methods include using chemical rust cleaners, such as white vinegar or stronger acids like phosphoric or muriatic acid, or applying coatings like Red-Kote to seal and protect the tank. Additionally, fuel tank treatments, which include the use of cleansers, stabilizers, lubricants, and performance boosters, can help maintain the health and performance of the engine, preventing future corrosion.
Characteristics and Values Table for Cleaning a Corroded Fuel Tank
| Characteristics | Values |
|---|---|
| Inspection | Check the exterior of the tank for damage, including deep dents, large cracks, or severe impacts. Uninstall the tank to conduct a complete visual inspection. |
| Fuel Handling | If the fuel is old, dispose of it safely. Otherwise, store it in a gas can or appropriate container. |
| Tank Condition Assessment | Assess the extent of corrosion and tank wall thickness. Consider if the tank is too damaged for derusting alone, and whether replacement is more cost-effective. |
| Cleaning Agents | Use white vinegar (acetic acid) as the safest option for at-home use, or opt for phosphoric or muriatic acid diluted with water for more potency. |
| Cleaning Process | Choose an acid to loosen rust and an agitator to dislodge particles. Perform cleaning in a well-ventilated area due to strong odours. |
| Fuel Tank Treatment | Pour a mixture of cleansers, stabilizers, lubricants, and performance boosters into the tank. This helps maintain engine health and prevents future corrosion. |
| Specific Products | Techron Fuel System Cleaner, Lucas Fuel Injection Cleaner, Redline Fuel Gas Treatment, and Chevron Techron Gas Treatment. |
| Preventative Measures | Keep the fuel tanks full and use "Top Tier" approved premium fuel to avoid recurrence of corrosion. |
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What You'll Learn
Assess the tank's condition and decide whether to replace it or de-rust
Before deciding whether to replace a corroded fuel tank or de-rust it, it is important to assess the tank's condition. This involves inspecting the tank for damage and corrosion. If the tank is severely damaged or corroded, it may need to be replaced.
To assess the condition of a fuel tank, it should be uninstalled and inspected for any exterior damage, such as deep dents, large cracks, or severe impacts. A complete visual inspection will help determine the severity of the corrosion and whether it has led to or exacerbated any structural issues. If the rust has caused or worsened structural problems, the tank may need to be replaced.
It is also important to check for water and microbial growth in the tank, as these are major contributors to corrosion. Water often forms in tanks during warmer months due to heat gain and evaporation, and it can be challenging to detect due to tank tilt. Utilizing water monitors and human inspection by trained personnel can help identify water and microbial presence. If water is detected, it should be removed immediately to prevent corrosion and maintain fuel system health.
After assessing the tank's exterior and addressing any water or microbial issues, the next step is to evaluate the extent of interior corrosion. This may require internal testing by experts with confined space entry training, as corrosion often forms from the inside of the tank and may not be visible from the exterior.
Once the extent of corrosion is determined, the decision to replace or de-rust the tank can be made. If the tank is severely corroded or structurally compromised, replacement may be the best option. However, if the corrosion is mild to moderate, de-rusting may be a viable alternative. The decision should also consider the cost and availability of replacement tanks, especially for classic or rare vehicles where spare parts may be difficult to obtain.
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Use white vinegar to loosen rust particles
White vinegar is an effective cleaning agent for corroded fuel tanks. It is an acid that can loosen and remove rust particles, leaving the tank bright and clean.
To use white vinegar to clean a corroded fuel tank, start by fixing the tank so that it is level. This will ensure that the vinegar comes into contact with all the rusted areas. Next, fill the tank with undiluted white vinegar, leaving just a small amount of space at the top. It is important to use cleaning vinegar with 9% acetic acid concentration, rather than diluted vinegar intended for culinary use. Depending on the level of corrosion, you may need up to 14 gallons of vinegar to fill the tank.
Let the vinegar sit in the tank for at least 48 hours, or up to a week. During this time, occasionally agitate the tank by bouncing or shaking it to help loosen the rust particles. After a few days, use a strong flashlight to inspect the tank's interior. If the vinegar has not yet removed all the rust, drain it, rinse the tank, and then refill it with vinegar for another week.
Once the rust is gone, drain the vinegar through a cheesecloth strainer and inspect the tank again. If there is no evidence of pitting, the tank is ready to use. If there are pits or signs of corrosion, coat the tank with a sealer, such as RedKote, to prevent further rusting.
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Coat the tank with Red-Kote
Coating the tank with Red-Kote is a popular method to seal fuel tanks. The process of coating a fuel tank with Red-Kote involves several steps to ensure the tank is clean and ready for the Red-Kote application. Firstly, it is important to remove any old fuel from the tank and dispose of it safely. If the tank has any cracks or holes, seal them with rubber or vinyl vacuum caps.
The next step is to clean the interior of the tank. This can be done by using a chemical cleaner, such as muriatic acid, diluted with water. The acid will loosen any rust and debris inside the tank. After using an acid, it is important to neutralise it with a water and baking soda rinse. Then, give the tank a final wash with acetone to remove any remaining oils.
Once the tank is clean and dry, it is time to apply the Red-Kote. The Red-Kote website will have detailed instructions on how to apply the product, but some users have shared their experiences online. One method is to put glass marbles in the tank and shake them around to knock off any remaining rust and debris. Another method is to use sharp stones or gravel in the same way, shaking and blowing out the dust until the tank is completely clean. After this, the tank can be washed with kerosene and dried.
It is important to note that Red-Kote can narrow the holes in the tank, as one user experienced when the copper petcock filters no longer fit. In this case, thinning the Red-Kote with acetone or a similar product may be necessary. However, it is always best to contact the vendor or manufacturer for advice on their recommended procedure.
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Use fuel treatments to remove gunk and grime
Before using any fuel treatments, it is important to take preventative measures. Keep a fire extinguisher nearby and remove any potential ignition sources. Tidy up your workspace and ensure you are working in a well-ventilated area. Wear a face mask and goggles to protect yourself from fuel fumes and potential splashes.
Now, to remove gunk and grime from your fuel tank, you can use a commercial de-greaser or mix dish detergent with hot water. Leave this mixture in the tank for 24 hours. After the de-greasing process, wash your fuel tank with water using a pressure washer. Try to point the sprayer at various angles to effectively remove the gunk from the tank walls.
You can also use a fuel tank treatment, often called a fuel system cleaner, to clean the interior of your fuel tank. These treatments use detergents and solvents to eliminate carbon deposits, varnish, and contaminants from the fuel system, including injectors, lines, and the carburettor. Pour the recommended amount of treatment into the tank when refuelling with gas. This "splash blending" technique ensures the treatment spreads throughout the fuel.
For rust removal, a mild acid like vinegar can be effective. Fill the tank with vinegar and let it sit for 12-24 hours, depending on the severity of the rust, then thoroughly rinse the tank with water.
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Use fuel stabilizers to prevent corrosion during storage
Fuel stabilizers are an effective way to prevent corrosion during storage. They are designed to maintain the quality of stored fuel and can extend its shelf life. Fuel stabilizers work by neutralizing and inhibiting the chemical reactions that lead to fuel degradation, preventing oxidation and preserving fuel stability. This, in turn, prevents the formation of acids, sediments, gums, and varnishes, which can clog fuel filters and injectors, hindering engine performance.
There are several benefits to using fuel stabilizers. Firstly, they can prevent issues caused by exposure to air, moisture, temperature changes, and extended storage periods. Secondly, they can protect the entire fuel system, increase engine performance, and improve fuel economy. Fuel stabilizers can also prevent microbial growth by removing water from the fuel, creating an environment that is unfavourable for microbial growth.
When using fuel stabilizers, it is recommended to add them to fresh fuel to allow for proper mixing. This ensures maximum effectiveness in preserving fuel quality during storage. One small bottle of stabilizer is typically enough to preserve a full tank of fuel in a car or truck. It is also important to run the engine for a few minutes to ensure the stabilized fuel circulates throughout the fuel system.
Some popular brands of fuel stabilizers include Sta-Bil, which is suitable for gasoline-powered vehicles, and Howes Meaner Power Kleaner, which is designed for diesel engines. Star Tron's Enzyme Fuel Treatment is another option that works for both gasoline and diesel engines, although it is more expensive.
In summary, fuel stabilizers are a crucial tool for preventing corrosion during storage. By inhibiting fuel degradation and maintaining fuel quality, stabilizers protect the fuel system and improve engine performance.
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