Sylvie Willis
The Second World War was decided by oil, with the highly energy-intensive machinery of war, such as tanks, requiring vast amounts of fuel. The fuel economy of a tank was around 0.5 miles per gallon, and the Allied forces alone used 100 times more gasoline in World War II than in World War I. As the war progressed, Germany faced increasing fuel shortages, and their tanks, which ran on gasoline, were outpaced by Soviet tanks, which ran on diesel. German driving schools used vehicles equipped with Stadtgas (city gas) in the form of LPG compressed gas bottles, while some tanks were powered by wood gas burners. The British used the Autovac system to fuel their tanks, which used reduced air pressure to pump fuel.
| Characteristics | Values |
|---|---|
| Fuel type | Petrol |
| Exceptions | Soviet tanks |
| US tanks | M2, M3, M4, M24, M26 Pershing |
| British tanks | M3 (Stuart), M4 (Sherman) |
| German tanks | Panzer III, Panzer IV, Panther, Tiger I, various self-propelled guns |
| Romanian tanks | R-2, Panzer III, Panzer IV, StuG III, R-3 |
| Japanese tanks | Inspired by European designs |
| Drop tanks | Used as bombs by American pilots |
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What You'll Learn
Petrol was manually poured into the tank by the crew
During World War II, the process of fuelling tanks was a manual one, with crew members physically pouring petrol into the tank. This was a laborious and time-consuming task, requiring a dedicated team of personnel to ensure that the tanks were adequately fuelled and ready for combat. The process would have been hazardous, with the risk of spillage and the ever-present danger of fire or explosion, always a concern.
The crew would have to locate the tank's fuel inlet, typically located on the vehicle's exterior, and carefully open the cap or cover. Using jerrycans, funnels, and hoses, they would carefully pour the petrol into the tank, being mindful of any spills or leaks. It was a slow process, and the amount of fuel needed meant that multiple crew members would be involved, working together to ensure a steady and controlled flow of petrol into the tank.
The crew had to be cautious, as the fumes from the petrol could be dangerous, and any spillage could result in a fire or explosion. Once the tank was full, the fuel inlet would be securely closed, and the crew would move on to the next tank, repeating the process until all vehicles were fuelled. This manual process would have been physically demanding and required a high level of concentration and teamwork.
The fuelling process would have been a regular and essential task for the crew, ensuring that the tanks were ready for combat operations. It is likely that the crew developed efficient methods and routines to complete this vital task, working together to overcome the challenges of manually fuelling these powerful machines.
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The fuel tank's location posed a fire risk
During World War II, the British invented the tank, which ran on petrol. The Mark I tanks had a fuel tank capacity of 50 gallons, with 25 gallons in each horn at the front of the tank. This fuel supply worked well for normal driving, but it posed a major drawback when the tank was nose down, as it often was when crossing trenches or shell holes on the battlefield. If the tank was nose down, the fuel supply would be cut off, immobilizing the vehicle. Additionally, if the tank came under fire from the front, the petrol in the unprotected tanks posed a serious fire risk, especially since the fuel filler was located next to the commander and driver's seats.
The Mark IV tank improved upon the fuel tank design by placing the petrol tank at the back of the vehicle, which was also larger, holding 70 gallons of fuel. This improved the range of the tank and made fuelling more accessible. However, putting the petrol tank below the engine presented a new problem: the fuel now needed to flow uphill, requiring a pump. Initially, an air pressure system was used, but it was unreliable as any air leaks or loss of pressure would cause the system to break down. The Autovac system was then introduced, which used reduced air pressure to pump the fuel, and this system was reused on all British tanks for the rest of the war.
While the Mark IV's fuel tank location reduced the fire risk compared to the Mark I, it still posed some dangers. The petrol tank was armoured, but if the tank's armour was penetrated, the petrol could catch fire, endangering the commander and driver seated nearby. Furthermore, the process of fuelling the tank was labour-intensive and awkward, with the fillers located at shoulder height next to the seats.
During World War II, fuel shortages and the need for alternative energy sources drove the German Army to experiment with gas-powered tanks. They converted half-tracks to run on wood gas burners, technically making them dual-fuel vehicles. However, these gas-powered tanks were not widely adopted due to economic and efficiency concerns. Overall, the fuel tank location in World War II tanks, such as the British Mark I and Mark IV, presented both advantages and drawbacks in terms of fire risk, and continued to evolve to improve safety and functionality.
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The Autovac system used air pressure to pump fuel
The Autovac system is a vacuum-operated fuel system that uses air pressure to pump fuel. It employs a small auxiliary tank, typically mounted on the engine side of the dashboard, with its base above the carburettor float chamber. The system is divided into two chambers: the inner or vacuum chamber, and the lower or reserve chamber. The vacuum chamber is connected to the induction pipe and the main petrol tank, while the reserve chamber is connected to the carburettor.
Communication between the two chambers is facilitated by the drop valve at the base of the inner chamber. The engine suction creates a partial vacuum in the upper chamber, causing the drop valve to close and drawing fuel from the main tank. As fuel flows in, the float rises, and once it reaches a certain height, two valves are activated. One valve cuts off the suction, while the other admits air, releasing the vacuum and allowing fuel to flow into the outer chamber.
The Autovac system was commonly used on commercial vehicles, particularly buses and coaches, and some vintage cars in the 1920s. It was favoured for its ability to eliminate the need for a fuel pump, which was an unreliable component in early automobiles. By utilising air pressure and vacuum principles, the Autovac system provided a more efficient and reliable means of fuel delivery.
While the Autovac system found application in various vehicles, it is unclear if it was specifically employed in tanks during World War II. Most tanks during that period utilised petrol fuel, and faced challenges with fuel supply due to gasoline shortages. However, the Autovac system's role in addressing fuel-related issues within tanks during World War II requires further specific information to establish a direct connection.
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Ventilation was inadequate, leading to dangerous fumes
During World War I, the first tanks were introduced in 1916. They were generally slow and challenging to manoeuvre, and they performed poorly in rugged terrain. The early models were heavily influenced by commercial tractors and were susceptible to heavy machine-gun fire and direct hits from high-explosive artillery rounds. The environment inside the tanks was extremely unpleasant due to inadequate ventilation. The atmosphere inside the tanks was heavy with poisonous carbon monoxide from the engine, fuel and oil vapours, and cordite fumes from the weapons. Temperatures inside could reach 50°C (122°F), causing entire crews to lose consciousness or collapse when exposed to fresh air.
The British Mark I tank, introduced in 1916, had fuel tanks located in the track horns at the front of the vehicle. This design presented a significant drawback when the tank was in a nose-down position, as it could easily occur when crossing trenches or shell holes on the battlefield. If the armour was penetrated, the unprotected fuel tanks posed a serious fire risk, endangering the driver and commander. The improved Mark IV tank addressed this issue by relocating the larger, armoured fuel tank to the rear of the vehicle, improving range and facilitating fuelling.
The French debuted their first tank, the Char d’Assaut Schneider CA1 Heavy Tank, on April 16, 1917. However, they lost seventy-six out of 132 tanks deployed due to poor planning and difficult terrain. The Schneider suffered from a critical design flaw: its fuel tanks were located in the front, making them vulnerable to enemy fire. The most successful French tank was the light Renault FT-17, the first to feature a rotating turret.
The German A7V Sturmpanzerwagen tank, which debuted in early 1918, had a top speed of eight kilometres per hour and a range of only twenty-four kilometres. It was unstable, prone to overheating, and required a crew of eighteen to operate. Germany produced only twenty A7V tanks during the war, as they could not justify the investment due to the tank's poor performance. Instead, they relied on captured British tanks to augment their armoured forces.
While I cannot comment specifically on the ventilation systems of the tanks mentioned, it is clear that inadequate ventilation was a prevalent issue in tanks during World War I and World War II. The presence of toxic fumes and extreme temperatures inside the tanks highlights the importance of improving ventilation systems in armoured vehicles.
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Fuel dumps were created for supply
The use of tanks in World War II built upon the novelty of the idea and the primitive state of the automotive industry during World War I. Tanks in World War I moved at a walking pace and were relatively unreliable. During World War II, nearly all tanks used petrol as fuel, except for Soviet tanks.
The establishment of fuel dumps involved the construction of storage tanks, pipelines, and other infrastructure to store and distribute fuel. Military forces also had to ensure the security of these fuel dumps, as they were critical to the continued operation of their armoured forces. Fuel dumps were vulnerable to enemy attacks, and as such, they were often heavily guarded and camouflaged to avoid detection. Fuel dumps were also mobile, with trucks and other vehicles being used to transport fuel to where it was needed, ensuring a constant supply for tanks and other vehicles.
The creation of fuel dumps played a crucial role in the success of armoured warfare during World War II. The ability to supply tanks with the fuel they needed was essential for the mobility and effectiveness of armoured units. The management of fuel dumps and the distribution of fuel was a complex logistical challenge, requiring coordination between military units and the civilian sector, including oil companies and transport providers.
In addition to the standard supply chain, alternative methods of fuelling tanks were also explored during World War II. For example, German military driving schools converted Sd.Kfz.251 half-tracks to run on wood gas burners, also known as Holzgas burners, as well as compressed Stadtgas. These vehicles were technically dual-fuel, as the gasification process required another fuel to start. The size of the gas storage containers depended on the vehicle, engine, and gasifier size. While these alternative fuel sources were explored, the standard supply chain, facilitated by fuel dumps, remained the primary method of fuelling tanks during the war.
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Frequently asked questions
Most tanks used petrol, except for Soviet tanks, which used diesel. German tanks used gasoline, and some US tanks used high-octane gasoline.
Tanks that were hit by shells could be ignited by the impact, and the fuel used could contribute to the likelihood of fire. For example, diesel fuel will begin to give off vapors at around 144 degrees Fahrenheit, and gasoline is even more flammable. Poor ammunition storage could also lead to tanks catching fire.
Gasoline shortages during the war forced the German Army to devise alternative energy sources for their training tanks. Additionally, the range of tanks was a concern, as larger fuel tanks would result in increased mass and poorer weight-to-power ratios, making them easier targets for enemies. The US Army also faced challenges with a lack of tanks during the early stages of the war, and had to use trucks painted with the word "tank" on their sides during training.
