Mercedes Mullins
There is no standard fuel tank size for a school bus, as the capacity depends on the manufacturer and the purchaser's specifications. Fuel tanks on school buses can range from less than 30 gallons to over 200 gallons. Some common fuel tank capacities for school buses include 50 gallons and 60 gallons, with some buses having even larger tanks of up to 250 litres. The location of the fuel tank can vary as well, with some buses having the tank mounted behind the stairs on the passenger side, while others have it placed behind the rear axle between the frame rails.
| Characteristics | Values |
|---|---|
| Standard fuel tank size | There is no standard size for a school bus fuel tank. It could be anywhere from less than 30 gallons to over 200 gallons, depending on what the original purchaser ordered from the factory. Some states, like Washington, require a minimum number of gallons. |
| Fuel tank capacity examples | Examples of fuel tank capacities for school buses include: 25 gallons, 30 gallons, 50 gallons, 60 gallons, 65 gallons |
| Fuel type | Diesel, gasoline |
| Fuel tank location | Behind the stairs on the passenger side, behind the rear axle between the frame rails |
| Factors affecting fuel mileage | Engine type, transmissions, rear end gearing, speed |
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What You'll Learn
School bus fuel tank sizes vary
The fuel tank capacity of a school bus can vary depending on several factors, including the model, make, and year of the bus. For instance, a 1993 Amtran Genesis school bus typically has a 25-gallon fuel tank, while a newer Bluebird bus may have a 30-gallon tank. Some bus models, such as the International, Thomas, and Bluebird, are designed to accommodate 65-gallon fuel tanks.
The location of the fuel tank on a school bus can also vary. Traditionally, fuel tanks were often mounted just behind the stairs on the passenger side. However, newer buses may have the fuel tanks mounted behind the rear axle between the frame rails, providing additional protection in the event of a side collision.
The choice of fuel type can also influence the size of the fuel tank. Some school buses run on gasoline, while others use diesel fuel. Gasoline tanks on buses usually range from 30 to 60 gallons. Diesel fuel tanks can vary as well, with some buses equipped with 50-gallon tanks and others offering larger capacities.
It's worth noting that factors such as engine type, transmissions, rear end gearing, and speed can impact fuel mileage. Additionally, removing seats and floors, as well as maintaining optimal speeds, can contribute to achieving better fuel mileage in school buses.
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Factors impacting fuel mileage
The fuel tank capacity of a school bus can vary, typically ranging from less than 30 gallons to over 200 gallons, depending on the specific orders placed by the original purchaser. Some states mandate a minimum fuel capacity for school buses; for instance, Washington requires a minimum capacity of 60 gallons for full-size buses.
Several factors influence the fuel mileage of a school bus, and understanding these factors is crucial for optimizing fuel efficiency and reducing operational costs. Here are some key considerations:
Engine and Transmission: Different engines offer varying fuel mileage. Transmissions and rear-end gearing also play a role in fuel efficiency. For instance, higher gears generally provide better fuel efficiency, and smooth gear shifts help maintain peak engine performance.
Speed and Acceleration: Speed has a significant impact on fuel mileage. Maintaining a steady speed and avoiding excessive speeds can improve fuel efficiency. Additionally, slow and smooth acceleration contributes to better fuel economy.
Braking: Frequent and sudden braking can reduce fuel economy. Instead, employing engine braking and downshifting techniques allow for a gentler stop, reducing the need for sudden acceleration afterward.
Route Planning: The type of route a bus takes can affect its fuel efficiency. Buses operating in urban areas with frequent stops and starts tend to have lower MPG ratings compared to those traveling on highways with fewer stops. Route optimization to minimize stops and congested routes can improve fuel mileage.
Vehicle Size and Weight: Larger and heavier buses tend to have lower fuel efficiency compared to smaller ones. The size and weight of a school bus, along with the number of passengers, contribute to increased fuel consumption.
Vehicle Maintenance: Proper maintenance of school buses is essential for optimal fuel efficiency. Regular fleet maintenance, including oil changes, tune-ups, and tire replacements, can improve the efficiency of older buses.
Driver Training: Proper driver training in fuel-efficient practices can significantly impact fuel mileage. This includes techniques such as smooth acceleration, efficient route planning, and understanding when to shift gears or employ engine braking.
Idle Time: Excessive idling wastes fuel. Implementing intelligent idling technology, such as vehicle idle shutdown timers, can help reduce unnecessary fuel consumption when the bus is stationary for extended periods.
By considering these factors and adopting fuel-efficient practices, school bus operators can enhance fuel mileage, reduce fuel costs, and contribute to more sustainable transportation solutions.
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Gas vs diesel tanks
School buses have traditionally used diesel as their fuel, but gasoline, electric, and propane school buses are now also available. There is no standard size for a school bus fuel tank, and its capacity can range from less than 30 gallons to over 200 gallons, depending on the original order from the factory. Some states, like Washington, mandate a minimum number of gallons.
Diesel Tanks
Diesel school buses are time-honored classics that have served well for many years. They are widely available, and there is no shortage of diesel school buses for sale. However, diesel engines are known for their loud noise and high emissions of harmful pollutants, such as nitrogen oxide (NOx). Diesel buses also require additional time for startup in cold weather and need to be plugged into block heaters.
Gas Tanks
Gasoline school buses are another option, but the focus of the discussion is often on alternative fuels like propane.
Propane Tanks
Propane school buses are gaining popularity and are the fastest-growing alternative fuel option for school districts. They offer several advantages over diesel buses:
- Reduced emissions: Propane engines emit fewer greenhouse gases, hydrocarbons, and particulate matter, improving local air quality.
- Lower harmful pollutants: Propane buses produce significantly lower levels of nitrogen oxide (NOx), which can aggravate asthma and harm the environment.
- Non-toxic: Propane is non-toxic and will not harm soil or water if accidentally released.
- Fuel cost savings: Propane can cost up to 50% less than diesel, leading to significant fuel savings over the life of the bus.
- Lower maintenance costs: Propane burns cleaner, extending engine life, reducing maintenance needs, and decreasing oil change frequency.
- Reduced refueling time: Propane refueling infrastructure is often simpler and faster than diesel refueling.
- Quiet operation: Propane buses operate more quietly than diesel buses, reducing noise pollution and creating a more pleasant environment for students and drivers.
- Immediate startup: Propane buses start up right away, even in harsh weather conditions, without needing additional heating measures.
- Safety features: Modern propane tanks have built-in safety features, including shut-off valves and protective structures, and propane has a higher ignition point than gasoline.
- Domestic production: Propane used in the US is often produced domestically, reducing dependence on foreign oil and contributing to energy security.
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Fuel tank locations
The fuel tank capacity of a school bus can vary depending on the model and the options chosen by the original purchaser. There is no standard size for a school bus fuel tank, and its capacity can range from less than 30 gallons to over 200 gallons. For example, a 1993 Amtran Genesis school bus with a mechanical DT466 and MT643 Allison transmission has a fuel tank capacity of 25 gallons, while a Bluebird school bus has a 30-gallon tank.
Some states, like Washington, require a minimum fuel tank capacity for full-size buses, which is 60 gallons. The fuel tank capacity can also depend on the engine type, transmissions, rear end gearing, and speed of the bus. For instance, a bus with a DT466 engine and a FL60 or 70 model rear end gearing may have a 50-gallon fuel tank and average 8.2 mpg.
Now, let's discuss the location of the fuel tank in a school bus. Typically, the fuel tank in a school bus is located underneath the bus, towards the rear end. This placement ensures that the weight of the fuel is distributed evenly and helps with the stability and balance of the bus when it is loaded with passengers.
The fuel tank is usually rectangular or oval-shaped and runs along the width of the bus. In some cases, there may be multiple fuel tanks located on either side of the bus. The fuel filler cap, which is used to refill the tank, is typically located on the side of the bus, towards the rear. This makes it accessible for refueling at gas stations.
To locate the exact position of the fuel tank on a particular school bus, you can refer to the bus's technical specifications or consult a mechanic familiar with school bus models. Each bus may have slight variations in fuel tank location and design, depending on the manufacturer and the specific model. Additionally, when inspecting the fuel tank, look for a tag that indicates the tank's size. This tag is usually located somewhere on the tank itself, although it may not be in a convenient place to read.
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Fuel tank weight and capacity
The weight and capacity of a school bus fuel tank vary depending on several factors, including the type of bus, the engine specifications, and the requirements of the purchaser. While there is no standard size for a school bus fuel tank, it typically ranges from less than 30 gallons to over 200 gallons in capacity.
The weight of a fuel tank is influenced by its size, material, and construction. Steel is a common material used for fuel tanks in vehicles such as school buses, and the weight of a steel fuel tank can range from around 145 lbs for a 65-gallon tank to potentially much heavier for larger tanks.
The capacity of a school bus fuel tank is determined by the bus manufacturer and the purchaser's requirements. Some states, like Washington, mandate a minimum fuel capacity for full-size buses, which is typically around 60 gallons. However, the actual capacity can vary significantly, with some buses having fuel tanks as small as 25 gallons or even less, while others may have tanks exceeding 200 gallons.
The engine type and transmission also impact fuel capacity and mileage. Engines like the DT466 and transmissions like the MT643 Allison can influence fuel efficiency, with some buses achieving 12 miles per gallon or more under certain conditions. Additionally, speed plays a significant role in fuel mileage, with slower speeds generally resulting in better fuel economy.
The placement of the fuel tank in a school bus can vary. Traditional locations include behind the stairs on the passenger side, while newer buses may have the fuel tanks mounted behind the rear axle between the frame rails for added safety in side collisions.
In summary, the weight and capacity of a school bus fuel tank can vary widely depending on the specific bus, engine specifications, purchaser requirements, and other factors. While there is no standard size, most school bus fuel tanks range from 30 to 200 gallons in capacity, with corresponding weights depending on the material and construction of the tank.
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Frequently asked questions
There is no standard size for a school bus fuel tank. It could be anywhere from less than 30 gallons to over 200 gallons, depending on what the original purchaser ordered from the factory.
Yes, some states like Washington require a minimum number of gallons for school bus fuel tanks. In Washington, the minimum is 60 gallons for full-size buses.
The fuel tank on a school bus is typically located behind the rear axle, between the frame rails. On older buses, the fuel tank may be mounted just behind the stairs on the passenger side.
School buses typically use diesel fuel, but some may be converted to run on gasoline or propane.
Speed has a significant impact on fuel mileage. For example, a Bluebird school bus with a 30-gallon tank gets 10-11 mpg at 60 mph, but the mpg decreases to 9-9.5 mpg at 65 mph.
