Katerina Swanson
Stainless steel is a popular material for fuel tanks because it is highly resistant to corrosion and not terribly difficult to weld. However, it is more expensive than mild steel and more prone to distortion. When creating a stainless steel fuel tank, it is important to take precise measurements of the space where the tank will be placed, considering the fuel pick-ups, vents, fuel filler, and other components. One may also choose to use aluminum for its lightweight and rust-resistant properties, but it is significantly more difficult to weld.
Characteristics and Values of a Stainless Steel Fuel Tank
| Characteristics | Values |
|---|---|
| Material | Stainless steel |
| Weight | Heavier than aluminium |
| Cost | More expensive than mild steel |
| Welding | Requires a good TIG welder; prone to distortion |
| Corrosion | Highly resistant |
| Design | Rectangular shape with six sides; two bolt circles on top |
| Mounting | Stainless straps |
| Prototyping | Cardboard mock-up |
| Manufacturing | Custom-made based on supplied blueprint |
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Measurements and design
When it comes to measurements and design, the first step is to take detailed measurements of the space where the fuel tank will be placed. This includes considering the space needed for fuel pick-ups, vents, fuel filler, mounting straps, fuel level sensors, and fuel lines. It is also important to ensure that the tank is located away from the exhaust to prevent overheating or, if that is not possible, to plan for heat shielding.
Creating a design on paper is a crucial step to ensure that the fuel tank will fit the intended space and that no design elements are missed. It is recommended to create a prototype or mock-up of the tank, with cardboard being a popular choice due to its ease of use and low cost. This allows for testing and adjustments before constructing the actual stainless-steel fuel tank.
The shape and size of the fuel tank will depend on the specific application. Most gas tanks are rectangular, which makes them easier to fabricate and fit into most spaces. A rectangular tank typically has six sides: the front, back, top, bottom, and left and right sides. However, it is more efficient to create the four largest parts from one piece of metal by bending three corners, reducing the amount of welding required and resulting in a stronger and better-finished tank.
When designing the tank, it is important to consider the placement of essential components, such as the fuel pump and fuel level sender. The fuel pump should be submerged, and the fuel level sender is fitted on the opposite side. Baffles should be welded into place to control fuel movement, and the edges of the tank can be curled using Round-Over dies on a beading machine. The end caps should be carefully cut to size, curled, and fitted before welding.
Some additional design considerations include the use of mounting tabs or brackets to secure the tank in place. However, it is important to ensure that these are adequately reinforced to handle the weight of the fuel and prevent cracking or tearing. Using thicker material or adding doublers can help distribute the load more evenly.
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Choosing the material
Stainless steel is highly resistant to corrosion, and its toughness makes it a durable option. While it is more expensive than mild steel, it may end up being a more cost-effective choice considering the costly coatings that mild steel requires. Additionally, stainless steel is easier to weld than aluminium, making it a more feasible option for those without advanced welding skills. However, stainless steel is prone to distortion and requires careful handling during the welding process to maintain its corrosion resistance.
Mild steel is a more affordable option, but it often requires extensive coatings to prevent corrosion, which can be tedious and may not hold up over time. For these reasons, mild steel may not be the best choice for a fuel tank.
Aluminium is a popular choice for fuel tanks due to its lightweight nature, being about 33% lighter than steel of equal strength. Its lightweight property makes it ideal for weight-saving purposes. Additionally, aluminium is easy to form and will not rust, making it a low-maintenance option. However, aluminium is notoriously difficult to weld, and most fabricators opt not to use it due to the challenges it presents. If you choose aluminium, you may need to take your fuel cell to a professional welder, which can add to the overall cost.
The choice of material depends on your specific requirements, budget, and skill set. Consider the advantages and disadvantages of each material and select the one that best suits your needs and capabilities. Remember, the fabrication process can be challenging, and it is essential to carefully plan and design your fuel tank before beginning construction.
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Welding
Before any welding takes place, it's essential to plan and design the fuel tank carefully. This includes taking precise measurements of the space where the tank will be placed, considering the location of fuel pick-ups, vents, fuel filler, mounting straps, fuel level sensors, and fuel lines. Creating a prototype or mock-up, especially using cardboard, is a recommended way to ensure the design fits the intended space and accounts for the interaction of other vehicle components. This step helps avoid costly mistakes and ensures a well-designed tank.
When it comes to the welding process itself, there are different techniques that can be used. One commonly mentioned technique is TIG welding, which is suitable for welding stainless steel and aluminium. The choice of welding technique will depend on the welder's skills, equipment, and the specific requirements of the project. It's worth noting that achieving a gas-tight seal can be challenging, and the quality of the weld highly depends on the welder's abilities.
Another important consideration during welding is the prevention of tank slosh. This phenomenon occurs when the fuel moves around in the tank during acceleration or cornering, potentially starving the fuel pump of fuel. To address this, baffles are welded into place inside the tank to control fuel movement. Additionally, the fuel pump may be isolated from sloshing by a small rectangular box at the bottom of the tank. The quality of the weld is directly impacted by the fit-up of the tank components, so care should be taken to achieve a tight fit before welding.
Finally, it's worth mentioning that welding stainless steel fuel tanks may require additional steps or techniques, such as bead rolling flat panels to stiffen them up, and the use of flanged joints instead of outside corners. Mounting tabs or brackets are also crucial considerations to support the weight of the fuel and prevent cracking. Overall, welding a stainless steel fuel tank requires a combination of careful planning, precise execution, and a good understanding of the material's properties and welding techniques.
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Coating
When selecting a coating, it is important to consider its compatibility with stainless steel and its ability to withstand the conditions within the fuel tank. The coating must be able to resist the chemicals in the fuel and any vapours that may be present. It should also be able to handle the temperature and pressure fluctuations that the tank may be subjected to.
The coating process itself can be tedious and challenging. It is essential to ensure complete and even coverage to avoid potential issues. Any gaps or thin spots in the coating can lead to corrosion or other problems over time. Proper surface preparation is also critical. The stainless steel surface must be clean and free of any contaminants that may interfere with the coating's adhesion.
Additionally, some coatings may require multiple layers or specific curing conditions to achieve optimal performance. It is important to follow the manufacturer's instructions and recommendations for the chosen coating product. Test patches and quality control checks can also be valuable to ensure the coating is applied correctly and will perform as expected.
The coating used for a stainless steel fuel tank can significantly impact its long-term performance and durability. Selecting a suitable coating material and carefully applying it according to instructions can help ensure the tank's longevity and protect your investment. While it may be a tedious process, it is a crucial step in the overall fabrication of a safe and functional fuel tank.
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Installation
Planning and Preparation:
Begin by taking precise measurements of the space where the fuel tank will be installed. Consider the surrounding components, such as the exhaust, and ensure there is adequate clearance. Create a detailed design drawing, including the height, width, and length of the tank, as well as the placement of the filler neck, vent, fuel pickup, and other components. A cardboard mock-up of the tank can be extremely helpful in visualising the design and ensuring a proper fit.
Materials and Fabrication:
Stainless steel is a great choice due to its corrosion resistance and weldability. When fabricating the tank, consider the shape and structure to enhance strength and stiffness. For example, use flanged joints instead of outside corners, and consider bead rolling flat panels for added rigidity. Ensure that the mounting tabs or brackets are sturdy and can withstand the weight of the fuel.
Welding and Assembly:
Before welding, coat both the inside and outside of the stainless steel tank to protect it. Install the baffles and weld them into place, ensuring a tight fit. Use a beading machine to curl the edges of the tank, and pay extra attention to the corners, which may require tuning with a hammer and dolly. Carefully fit the end caps and tack-weld them into place. The quality of the welds is crucial, so take your time and ensure proper technique.
Final Installation:
Once the tank is welded and sealed, it's time for final installation. Secure the tank in place using straps, such as the simple system of stainless straps devised by Don Houseman. Ensure that the filler tubes are clean and accessible. Test the installation by filling the tank and checking for any leaks or issues. Ensure that the tank is properly vented and that the fuel pickup and return lines are functioning correctly.
By following these steps and paying attention to detail, you can successfully install a stainless steel fuel tank, ensuring a safe and reliable fuel system.
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Frequently asked questions
Stainless steel is highly resistant to corrosion and is not too difficult to weld.
You will need a good tig welder and a beading machine.
Most gas tanks are rectangular, which makes them easier to fabricate and fit into most spaces.
You should take measurements of the space where your fuel tank will be placed and make a cardboard prototype to ensure that your design fits.
Stainless steel is more expensive than mild steel and is more prone to distortion.
