Sylvie Willis
Building a fuel tank for a car is a complex process that requires careful planning and execution. It involves taking precise measurements, designing a prototype, selecting the right materials, and constructing a sturdy and safe tank that meets the vehicle's specifications. While some people opt for custom-made fuel tanks from companies like Rock Valley Antique Auto Parts, others choose to fabricate their own, requiring advanced skills in welding, metalworking, and engineering. This process includes considerations such as fuel capacity, placement, and interaction with other vehicle components, such as the exhaust system.
| Characteristics | Values |
|---|---|
| Materials | Stainless steel, mild steel, aluminium |
| Design | Rectangular with six sides, or with bends in three corners |
| Planning | Measure the space, draw up the design, create a cardboard prototype |
| Construction | Welding, cutting, clamping, hammering |
| Additional features | Fuel sumps, trap doors/dividers, baffles, foam |
| Safety | Avoid mounting in the cab, test for leaks |
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$115.5
What You'll Learn
Measure the space for the fuel tank
Measuring the space for your fuel tank is a crucial first step in the process of making a custom fuel tank for your car. It is time-consuming, but it will save you from potential disasters down the line. You need to be certain that your tank will fit in the space you have allocated, and that it will not interfere with other components of your car, such as the exhaust, rear end, and cross members.
Start by taking meticulous measurements of the space where you plan to place the fuel tank. It is best to have a piece of paper and a pencil handy to jot down the measurements and sketch out a design. This will help you visualise the space and ensure that your tank will fit snugly.
Consider the shape and dimensions of the tank. Most gas tanks are rectangular, with six sides: the front, back, top, bottom, and left and right sides. This shape is popular because it fits efficiently into most spaces. However, you can also design a tank of any shape and size to fit the specific space in your car.
When measuring and designing your tank, keep in mind that you will need to allow space for fuel pick-ups, vents, fuel fillers, mounting straps, fuel level sensors, and fuel lines. Additionally, ensure that the tank will not be located too close to the exhaust, as this could pose a safety hazard. If it is near the exhaust, you will need to plan to build heat shielding around the tank.
Finally, consider creating a cardboard mock-up of your tank. This will allow you to test the fit in the allocated space and ensure that your design is feasible. You can also take this mock-up to a metalworker who can bring your design to life.
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Choose the material
Choosing the right material for your fuel tank is crucial. You have several options to choose from, each with its own advantages and drawbacks.
One popular option is to use stainless steel. Stainless steel is a durable and robust material that can withstand corrosion. It is an excellent choice for a fuel tank as it will not rust, ensuring a long lifespan. However, it does require careful construction. You will need to coat both the inside and outside of the tank to prevent corrosion, which can be tedious and challenging to get right.
Another option is to use aluminum. Aluminum is lightweight, easy to form, and resistant to rust. It is a good choice if you want to showcase the craftsmanship of your fuel tank, as many aluminum tanks are left in bare metal and can become a focal point in the vehicle's design.
You can also consider using mild steel, but it is essential to note that this material is corrosive. Similar to stainless steel, you will need to apply a coating to both the inside and outside of the tank, which can be a challenging process that may not hold up over time.
Additionally, some people opt for poly tanks, which are considered safer, but they tend to take up valuable cargo space.
Ultimately, the choice of material depends on your specific requirements, the desired appearance, and your level of expertise in working with different materials.
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Design the tank
Designing a fuel tank for a car requires careful planning and consideration of various factors. Here are some detailed instructions to guide you through the design process:
Measurements and Space Considerations:
Start by taking precise measurements of the space where you plan to place the fuel tank in your car. Consider the surrounding components, such as the exhaust, rear end, and cross members, and ensure there is enough room for fuel pick-ups, vents, fuel fillers, mounting straps, fuel level sensors, and fuel lines. It's crucial to choose a location that won't be exposed to excessive heat from the exhaust, or plan to incorporate heat shielding.
Shape and Material Selection:
Most fuel tanks are rectangular in shape, as it simplifies the fabrication process and allows for efficient use of space. This shape consists of six sides: the front, back, top, bottom, and left and right sides. Consider the desired shape and dimensions of your tank, ensuring it fits well within the allocated space.
Regarding materials, you have several options, each with its advantages and drawbacks. Stainless steel is an excellent choice for a fuel tank due to its durability and corrosion resistance. Aluminum is another popular option as it is lightweight, easy to form, and resistant to rust. However, if you choose mild steel, remember that it is corrosive, and you will need to carefully coat both the inside and outside of the tank.
Tank Capacity and Blueprints:
Calculate the fuel capacity of your tank using the formula H x W x L x 0.004329, where H, W, and L represent the height, width, and length of the tank, respectively. Create a detailed blueprint or drawing of your tank design, including its dimensions, the location of the filler neck, vent, roll-over valve, fuel pick-up, and FI pump (if needed). If you plan to have a company fabricate the tank for you, they will review your design and may suggest modifications to ensure feasibility.
Fuel Sump and Trap Doors:
Consider incorporating a fuel sump to prevent fuel-starving issues. A sump can be created by building a circular base that is 4"-5" in diameter and a quarter of the height of your fuel tank. Additionally, you can enhance the performance of your tank by dividing it into sections or small cells with trap doors or small holes between them. This design reduces fuel sloshing during rapid acceleration and helps maintain the balance of the car by keeping the weight of the fuel concentrated in a small area.
Prototype and Testing:
Before finalizing your design, it is highly recommended to create a prototype or mock-up of your tank. Cardboard is an excellent, inexpensive material for this purpose. Build a cardboard model of your tank and test its fit within the intended space. This step allows you to identify any potential issues or adjustments needed before committing to the final construction.
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Build a prototype
Before you start building your fuel tank, it is important to take measurements of the space where you plan to place it. This includes considering the space needed for fuel pick-ups, vents, fuel fillers, mounting straps, fuel level sensors, and fuel lines. Additionally, ensure that the tank will not be located near the exhaust, or plan to build heat shielding to protect it from the heat.
Once you have your measurements, create a design on paper, including the height, width, and length of the tank, as well as the location of the filler neck, vent, roll-over valve, fuel pick-up, and FI pump. You may also need to include the radius measurement of the corners. At this stage, you can also decide on the material you will use to build the tank. Common options include mild steel, stainless steel, and aluminum.
After finalizing your design, it is recommended to create a prototype or mock-up of your fuel tank to test the design. Cardboard is a great material to use for this purpose, as it is easy to work with and can help you visualize how the final tank will fit into the intended space. You can also use this prototype to get quotes from sheet metal workers if you plan to outsource the fabrication.
If you are satisfied with your prototype and have addressed any potential issues, you can move on to building the actual fuel tank. This will involve cutting and welding the chosen material according to your design. Ensure that you follow all safety precautions when working with flammable materials and welding equipment.
It is important to test your fuel tank for leaks before installing it in your vehicle. One method is to fill the tank with water and apply air pressure to locate any leaks. Once you are confident that the tank is safe and leak-free, you can proceed with the installation, making sure to secure the tank with straps or a similar method.
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Test for leaks
Testing for leaks in a fuel tank is an essential step to ensure the safety and functionality of your car. Here is a detailed guide on how to test for leaks in a fuel tank:
Prepare the Tank:
Before testing, it is crucial to ensure that the fuel tank is empty and free from any residual fuel or debris. Clean the tank thoroughly and inspect it for any visible signs of damage, such as cracks or pinholes.
Pressure Testing:
Pressure testing is a commonly used method to check for leaks in fuel tanks. It is a safe and effective way to identify any vulnerabilities in the tank's structure. Here's how you can perform a pressure test:
Equipment:
You will need a leak down tester or a similar device that can pressurize the tank. Ensure that you have the necessary fittings and connections to attach the tester to your fuel tank securely.
Air Quality:
Use dry, filtered air during the pressure test. Running your air supply through a filter will help remove any moisture that could affect the accuracy of the test or cause corrosion in the tank.
Pressure Settings:
For safety reasons, do not exceed a pressure of 5 psi (pounds per square inch) during the test. This is the maximum recommended pressure for fuel tank testing.
Testing Procedure:
- Attach the leak down tester to the fuel tank according to the manufacturer's instructions, ensuring all connections are secure.
- Slowly pressurize the tank up to the recommended pressure level.
- Observe the pressure gauge and watch for any fluctuations or drops in pressure, which could indicate a leak.
- Use soap solutions or leak detection sprays on suspected leak areas to confirm. These products create bubbles or colored indicators when they come into contact with escaping gas.
- If you identify a leak, you will need to repair or weld the affected area and re-test the tank to ensure the leak has been sealed.
Safety Precautions:
Pressure testing should always be performed in a well-ventilated area to prevent the buildup of flammable gases. Ensure that there are no sources of ignition nearby, and always wear appropriate safety gear, including eye protection and gloves.
By following these comprehensive steps, you can effectively test for leaks in a fuel tank, ensuring the safe and reliable operation of your vehicle.
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Frequently asked questions
First, take measurements of the space where you plan to place the fuel tank. It is also recommended to create a cardboard mock-up of the tank to test how it fits in the intended space. Once you have your design on paper, you can start building a prototype.
You can use materials such as stainless steel, mild steel, or aluminum to build a fuel tank. Stainless steel is a great option as it is resistant to corrosion. If you choose mild steel, remember that it is corrosive, so you will need to coat the inside and outside of the tank. Aluminum is also a good choice as it is lightweight, easy to form, and won't rust.
The majority of gas tanks are rectangular, which makes them easier to fabricate and fit into most spaces. However, you can also make a tank of any size and shape to fit the specific requirements of your car.
Ensure that you have space for fuel pick-ups, vents, fuel filler, mounting straps, fuel level sensors, and fuel lines. Also, consider the location of the tank in relation to the exhaust. If it is close to the exhaust, you may need to build heat shielding to protect the tank.
Yes, there are companies such as Rock Valley Antique Auto Parts and DrSmash that specialize in building custom fuel tanks for cars, planes, boats, and more. You can provide them with your design specifications, and they will work with you to create a tank that meets your needs.
