Rajan Wilcox
Fuel tank capacity and size are important factors to consider when understanding how a vehicle operates. The average fuel tank size for cars is 50–60 litres (12–16 gallons), while trucks have larger tanks that can hold 20–40 gallons of fuel. Underground storage tanks (USTs) are also used for commercial and residential purposes and can vary in size, with some holding up to 30,000 gallons of diesel fuel. So, when asking about the height of a flat fuel tank, it is important to consider the context, as the height will depend on the type and capacity of the tank.
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What You'll Learn
Average fuel tank capacity for cars
The average fuel tank capacity for cars varies depending on the type and model of the car. The average fuel tank capacity for cars is 50–60 L (12–16 US gallons or 10.5-18.5 gallons). Smaller vehicles like subcompact crossovers and other hatchback models generally have a capacity of around 12 gallons. For example, the Chevrolet Spark has a 9-gallon tank. Chevrolet models in the SUV or crossover category, like the Chevy Trax or Equinox, have 14-gallon tanks. Models with larger, more powerful engines, like the Chevy Corvette or Camaro, have tank sizes of 18.5 and 19 gallons, respectively.
The size of a vehicle's fuel tank is typically larger than the stated capacity. This is to prevent overfilling, which can cause significant expansion and additional pressure on the engine. Trucks generally have larger fuel tanks compared to sedans and smaller cars, with an average fuel tank size ranging from 20 to 40 gallons. A full-size pickup truck might have a tank capacity of around 26 gallons, while larger commercial trucks can go up to 40 gallons or more.
The fuel tank size of a vehicle is an important consideration for understanding how it operates. Knowing the fuel tank capacity can help with fuel management, cost estimation, and vehicle maintenance. It can also impact the weight and space requirements of the vehicle, especially in smaller cars. Some vehicles include a smaller reserve tank to be used when the main fuel tank is empty, while others have a large secondary tank to increase their range.
It is worth noting that the fuel tank capacity is usually indicated in the vehicle's manual or on a sticker inside the fuel door. This information can be essential for planning long trips and avoiding the inconvenience of running out of gas. Additionally, modern vehicles are designed to indicate low fuel levels well before the tank is completely empty, often through a fuel-level indicator or a fuel-level sending unit.
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Fuel tank materials
Fuel tanks are used to store flammable gasoline and fuel and are used in nearly all automobiles and aircraft. The most common materials for fuel tanks are metal or plastic.
Metal fuel tanks are usually built by welding stamped sheet metal parts together. Steel is one of the least expensive customisable fuel tank fabrication materials. It is exceptionally strong and can be built to fit the available space. Steel tanks are often made of thicker plates to account for sacrificial rusting. Steel is also not particularly susceptible to other forms of exotic corrosion.
Aluminium is another popular choice for metal fuel tanks. It is lightweight and easy to cut. However, it is prone to corrosion. Manufacturers often offer to coat aluminium tanks with corrosion-inhibiting epoxies. Aluminium tanks should not be used with bronze and brass plumbing fittings as the dislodged copper molecules will work their way into the aluminium.
Plastic fuel tanks are usually built using blow moulding, which allows for more complex shapes. Plastic (high-density polyethylene HDPE) is a viable short-term option but has the long-term potential to become saturated as fuels like diesel and gasoline permeate the material.
Other materials used for fuel tanks include fiberglass, stainless steel, and black iron.
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Fuel tank construction
Fuel tanks are used to store flammable fluids, most often gasoline or diesel fuel. They are typically made from metal or plastic, with metal tanks constructed by welding stamped sheets of steel or aluminium together, and plastic tanks made using blow moulding.
When constructing a fuel tank, it is important to first determine the size and shape of the tank. This can be done by creating a mockup, usually out of foam board or cardboard. This allows the craftsman to visualise the final product and make any necessary adjustments to the design before committing to more expensive materials. Once the design has been finalised, the craftsman must select the appropriate material for the tank, taking into consideration factors such as durability, cost, and compatibility with the stored fuel.
The next step is to cut the chosen material to the required shape and size. For metal tanks, the pieces are then bent to form the basic shell and ends of the tank. Openings for the filler neck, fuel pickup, drain, and fuel-level sending unit are also added, either on the flat shell or at the end of the fabrication process. For plastic tanks, blow moulding is used to create the desired shape, with the various components such as the pump, control electronics, and hosing encased within the tank.
Finally, the pieces that will move fuel in and out of the tank must be laid out. This includes adding a fuel level sensor and ensuring that there is a space for a large fuel door if the tank will not be filled using the factory gas fill area. Pressure testing the fuel tank is essential to ensure that there are no leaks.
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Fuel tank size in trucks
Fuel tanks are designed to store and transport flammable liquids, such as gasoline, diesel fuel, liquefied petroleum gas, and aviation fuel. The size of a fuel tank in a truck can vary depending on the type of truck, its intended use, and the specific requirements of the cargo.
Tanker trucks, for instance, are specifically designed for transporting liquids and come in a range of sizes. They are categorized by their volume capacity and size, with small tanker trucks having a maximum capacity of around 3,000 gallons, while larger tankers can hold up to 11,600 gallons. The capacity of these trucks is typically limited by weight restrictions, such as the 80,000-pound gross weight limit for trucks in the US.
The design of a fuel tank involves careful consideration of its size and shape. Craftsmen often create a mockup, usually out of foam board, to determine the optimal dimensions. They also address design issues pertaining to the placement of outlets, drains, fluid level indicators, seams, and baffles. Baffles are structures within the tank that help stabilize the liquid cargo and improve transport efficiency by minimizing liquid movement.
Fuel tanks used in trucks can be made from various materials, including metal and plastic. Metal tanks are commonly constructed by welding stamped sheet metal parts together, while plastic tanks are often created using blow molding techniques, allowing for more complex shapes. The choice of material depends on factors such as cost, weight, durability, and the type of liquid being transported.
In addition to size and material considerations, fuel tank design must also address safety concerns. For example, fuel tanks used for transporting flammable liquids need to have overfill protection and grounding verification systems in place. Vapor recovery systems are also crucial to prevent the release of hazardous vapors into the atmosphere during loading and unloading operations.
Furthermore, the size of a fuel tank in a truck can impact its range and performance. Larger fuel tanks increase the distance a vehicle can travel between refills, but they also add weight and occupy valuable space, which can be a significant consideration for smaller vehicles. As a result, some trucks incorporate a smaller reserve tank that can be utilized when the main fuel tank is depleted.
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Fuel tank safety
Design and Materials
Fuel tanks are designed to withstand various stresses and forces, including changes in temperature, pressure, and altitude. They are typically constructed from resilient materials like aluminium alloys or composite materials, which resist corrosion and leakage. Aircraft fuel tanks may be integral, rigid removable, or bladder types, each with unique safety considerations.
Maintenance and Inspection
Proper maintenance and inspection of fuel tanks are crucial. This includes checking for defects or damage that could lead to fuel leaks or malfunctions. Fuel lines, pumps, valves, filters, and other components within the intricate fuel system network require regular attention to ensure safe operation.
Grounding and Static Electricity Prevention
Grounding procedures are essential during fuelling to prevent static electricity buildup, which could ignite fuel vapors. This is a critical safety consideration, especially in aircraft fuelling procedures, where strict protocols are in place.
Ventilation and Vapour Management
Ventilation systems play a vital role in fuel tank safety. Proper airflow is maintained to prevent vapour buildup and pressure spikes that could lead to explosions. Fuel tank inerting is a technique used, particularly in military applications, where the potentially flammable gas space above the fuel (ullage) is replaced with a non-flammable atmosphere using inert gas.
Compatibility and Overfilling
Ensuring compatibility between fuel types and aircraft systems is essential. Additionally, avoiding overfilling tanks is crucial to prevent spillage and manage fuel vapors effectively.
Training and Certification
Aviation authorities worldwide, such as the FAA in the US and EASA in Europe, mandate strict rules and standards for fuel tank safety. Comprehensive training and certification programs are in place for various aviation roles, including engineers and mechanics, pilots, and ground crews, to ensure a strong culture of safety.
On-Site Fuel Storage Tank Safety
For businesses relying on on-site fuel storage tanks, safety is paramount. This includes installing tanks away from potential hazards like ignition sources and high-traffic areas. Regular inspections, maintenance, and employee education on risks and safety protocols are vital. Fire safety equipment and emergency response plans are also crucial components of on-site fuel tank safety.
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