Sylvie Willis
The type of diesel fuel used in tractors has evolved over time. Gasoline was the primary fuel for tractors until the 1960s, when diesel began to replace it. By the 1970s, nearly all farm tractors used diesel engines. Today, gasoline is typically only used in lawn tractors or other small equipment. Diesel fuel is now the standard for tractors, but there are variations to be aware of. For example, “off-road” diesel is intended for tractors and other heavy equipment and is typically dyed red and taxed differently from on-road diesel. Additionally, some tractors may require additives to compensate for the reduced lubricity of ultra-low-sulfur diesel fuels.
| Characteristics | Values |
|---|---|
| Use of standard diesel fuel in tractors | Standard diesel fuel can be used in tractors, but it is typically reserved for on-road use and may be taxed differently than off-road diesel fuel. |
| Off-road diesel fuel | Off-road diesel fuel is often dyed red and has no road tax. It is intended for use in heavy equipment, machinery, and vehicles used for off-road applications, such as tractors, farm trucks, and generators. |
| On-road diesel fuel | On-road diesel fuel is sometimes referred to as "premium" or "blue" diesel and is used for vehicles operating on public roads. |
| Tractor fuel types | Tractors have historically used various fuel types, including gasoline, liquified propane (LP), tractor vapourising oil or distillate, and kerosene. |
| Additives | Diesel additives or treatments are sometimes used to improve performance, especially in cold weather, and to compensate for the lower sulphur content in modern diesel fuels. |
| Biodiesel | Biodiesel can be used in tractors, but it may require more frequent fuel filter changes due to its tendency to absorb impurities in the fuel system. |
| Climate considerations | Diesel fuel is typically blended according to the season to ensure optimal performance in different climates. Winter diesel is thinner to prevent gelling at low temperatures. |
| Sulphur content | Ultra-low sulphur diesel (ULSD) is now standard across on-road and off-road diesel fuels due to government regulations. Older tractors may require additives or modifications to run on ULSD. |
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What You'll Learn
- Diesel fuel has been used in tractors since the 1930s, becoming the primary fuel source in the 1950s
- Kerosene was used as tractor fuel in the early 20th century but is now obsolete
- Modern gasoline is better quality than the highest-grade gasoline available when tractors were first built
- Off-road diesel is dyed red and has no road tax, but using it on the road can result in a fine
- Additives can be used to compensate for lubricity loss in ultra-low-sulphur diesel
Diesel fuel has been used in tractors since the 1930s, becoming the primary fuel source in the 1950s
Diesel fuel has been used in tractors since the 1930s, when it first appeared in large agricultural crawlers. However, it wasn't until the 1950s that diesel became the primary fuel source for farm tractors. Early diesel engines were difficult to start, which limited their use. Some manufacturers built spark-ignition diesel engines, while others used small gasoline "pony motors" to warm and start the diesel main engine.
During the early 20th century, kerosene was a common tractor fuel. Like tractor fuel, it was used in ""all fuel" engines after the engine had warmed enough to allow efficient combustion. However, with the advent of cheaper gasoline after World War II and the emergence of diesel engines, kerosene fell out of use as a tractor fuel.
By the 1960s, diesel was rapidly replacing gasoline as the primary fuel for tractors, although gasoline remained an option into the 1970s. By the 1970s, nearly all farm tractors had transitioned to diesel engines. The lowest grade of gasoline available today is often better than the highest grade available when these engines were first built.
Today, diesel fuel is the standard for tractors, with gasoline only being used in lawn tractors or other small equipment. Diesel fuel is available in different varieties, such as "off-road" and "on-road" diesel, which differ primarily in their taxation and intended use. "Off-road" diesel, also known as "tractor diesel," is meant for use in heavy equipment and machinery and is taxed differently from "on-road" diesel, which is used in regular vehicles.
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Kerosene was used as tractor fuel in the early 20th century but is now obsolete
Kerosene was a popular fuel for tractors in the early 20th century. It was used in "'all fuel'" engines after the engine had warmed enough to allow efficient combustion of the kerosene. Kerosene was also a popular fuel for space heaters, which were often built into kitchen ranges and kept many farm and fishing families warm and dry through the winter.
However, several factors contributed to the decline of kerosene as a tractor fuel. Firstly, the rise of the gasoline-powered automobile in the early 20th century led to a demand for lighter hydrocarbon fractions. This prompted refiners to increase their output of gasoline while decreasing their output of kerosene. Additionally, some of the heavier hydrocarbons that were previously used in kerosene were incorporated into diesel fuel.
Another factor was the development of refining techniques during and after World War II, which made it possible to convert tractor fuel into more useful fuels, such as gasoline and diesel. Cheaper gasoline, along with the increasing popularity of diesel engines, caused kerosene to become obsolete as a tractor fuel.
Today, kerosene is still widely used in aviation and households, particularly in portable heaters and stoves. However, its use as a tractor fuel is no longer common, with most tractors now powered by diesel or gasoline engines.
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Modern gasoline is better quality than the highest-grade gasoline available when tractors were first built
The use of diesel fuel in large agricultural tractors began in the 1930s, but it wasn't until the 1950s that diesel became the primary fuel source for these vehicles, with nearly all farm tractors using diesel engines by the 1970s. Before this, gasoline was the primary fuel for tractors, with some engines starting on gasoline and then switching to diesel.
Today, gasoline is only used in lawn tractors or other small equipment. Modern gasoline is of better quality than the highest-grade gasoline available when tractors were first built. This is due to various factors, including improved refining techniques and a better understanding of fuel chemistry.
Firstly, modern gasoline is a highly refined product, with crude oil containing up to 100,000 carbon compounds, while gasoline is a blend of several hundred of these compounds. The blend is carefully formulated to perform across a range of temperatures and altitudes, burn as efficiently and cleanly as possible, and remain stable during transportation and storage. Refining techniques have improved since the early days of gasoline, particularly during World War II, when techniques were developed to convert tractor fuel into more useful fuels.
Secondly, modern gasoline has a longer shelf life than older gasoline. Regular gasoline today has a shelf life of three to six months, while premium or high-octane fuel can last up to nine months. In comparison, the tractor fuel used in the past had a lower grade than modern gasoline and was less stable, with a higher risk of degradation over time.
Additionally, modern gasoline contains additives and fuel stabilizers that enhance its performance and prolong its life. These additives improve lubricity, especially in ultra-low-sulfur diesel fuels, and protect against moisture build-up, corrosion, and fuel breakdown. While some older tractors may require additives to run modern diesel, the fuel itself is of higher quality.
Finally, modern gasoline is designed to work with modern engine technologies, which have improved in efficiency and performance. For example, higher voltage electrical systems, on-demand power steering, and continuously variable transmissions all contribute to more efficient engine breathing and improved overall engine performance.
In summary, modern gasoline is of better quality than the highest-grade gasoline available when tractors were first built due to advancements in refining techniques, fuel chemistry, and engine technologies. These improvements have resulted in a more stable, efficient, and longer-lasting fuel that enhances the performance of modern engines.
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Off-road diesel is dyed red and has no road tax, but using it on the road can result in a fine
Off-road diesel, also known as red diesel, is dyed red to indicate that it is tax-exempt fuel. This type of diesel is intended for non-highway applications, such as tractors, farm trucks, generators, and construction equipment. While it is allowed to be used in tractors for off-road purposes, there are restrictions on its on-road use.
The reason off-road diesel is cheaper is that it is exempt from federal and state highway taxes, which are typically paid at the pump when purchasing regular diesel. These taxes are used for road maintenance. When you use off-road diesel on public roads, you are essentially evading these taxes, which is illegal.
To enforce the proper use of off-road diesel, the US government launched the Dyed Fuel Enforcement Program in 1994. This program, run by the Internal Revenue Service (IRS), imposes fines on those found using dyed diesel illegally. The fine is set at $10 per gallon or $1,000 per violation, whichever amount is greater. For example, if you are caught with 20 gallons of red diesel in your tank, you will be fined $1,000.
To detect the use of off-road diesel on the road, authorities can visually inspect the fuel by shining a flashlight into the gas tank or using a test strip to dip into the fuel. The red dye in the fuel makes it easy for authorities to identify illegal use. In addition to the financial penalty, it is reported that the dye may also stain your fuel tank and subsequent fuel fillings, serving as further evidence of the violation.
It is important to note that there are exemptions to the restrictions on using red diesel on the road. Certain users, such as public school districts, government agencies, and nonprofit educational organizations, can obtain a license from the IRS to use dyed diesel on the road. Additionally, tractors and other farm equipment are permitted to use red diesel within a distance of 25 miles from their registered address. However, for other on-road uses, it is recommended to purchase regular diesel from reputable suppliers to avoid any legal consequences.
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Additives can be used to compensate for lubricity loss in ultra-low-sulphur diesel
The use of standard diesel fuel in tractors is a complex issue, with various factors influencing fuel choice. Tractors have used diesel fuel since the 1930s, and by the 1970s, nearly all farm tractors used diesel engines. However, the type of diesel has evolved over time, with ultra-low-sulphur diesel (ULSD) now being widely used due to environmental regulations. This shift has presented challenges, as sulphur historically acted as a natural lubricant in diesel fuels.
The removal of sulphur from diesel has led to a significant loss of lubricity, which can cause serious issues for engines operating on fine tolerances. Lubricity is vital to engine performance and durability, as it helps protect metal surfaces from wear and failure. Without sufficient lubricity, engine components can experience heightened wear and friction, leading to potential engine failure.
To compensate for the loss of lubricity in ULSD, additives can be used. These additives, such as biodiesel, fatty acid methyl esters, and DieselAid®, work by forming a protective layer on metal surfaces, similar to the function of sulphur. They enhance lubricity, reduce wear, and improve fuel performance. The use of these additives underscores the necessity for standardised testing to ensure diesel fuels meet minimum lubricity requirements, with tools like the High-Frequency Reciprocating Rig (HFRR) being used to evaluate and maintain fuel lubricity standards.
The addition of these lubricity-improving additives has been shown to be effective. For example, a study by Liu et al. (2019) found that adding fatty acid methyl esters to ULSD significantly improved its lubricating properties. Furthermore, biodiesel blends of up to 20% with diesel fuel can effectively reduce wear and friction without negative environmental side effects. These additives provide a renewable, lower-emission alternative, setting aside the threat of environmental pollution posed by chemically derived diesel additives.
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Frequently asked questions
You can use standard diesel fuel in tractors, but it is important to note that diesel with lower sulphur content may need an additive to make up for the lubricity lost with the reduction in sulphur. In addition, diesel with a higher sulphur content is often labelled for off-road use only and may be dyed red. Using this type of diesel fuel on the road may result in a fine.
Tractors built through World War II either used gasoline or could use gasoline in an 'all-fuel' engine. Kerosene was also commonly used as tractor fuel in the early 20th century. Today, gasoline is only used in lawn tractors or other small equipment.
The primary difference between on-road and off-road diesel is the tax applied to the fuel. Off-road diesel is typically dyed red and labelled "off-road" to distinguish it from on-road diesel.
Tractor fuel was a low-grade fuel produced between gasoline and diesel in the traditional distillation of crude oil. New refining techniques developed during World War II made it possible to convert this into more useful fuels, and it began to disappear.
