On-road diesel is either clear or somewhat green in appearance. When diesel fuel is freshly dispensed into a bottle to observe its color, refineries add a green dye, which is visible. This dye fades to yellow or darker colors as the fuel ages. Checking the fuel for a “bright” appearance, with the faint green dye being a giveaway that the diesel is new and in good condition, is part of a visual inspection to assess diesel fuel quality.
What is dyed diesel?
Diesel contains dye in almost all of it. When we talk about dyed diesel, we usually mean a red dye applied to off-road diesel. Off-road diesel is typically used for heating oil, construction fueling, agricultural use, and other off-road equipment not needed to pay fuel taxes on the highway system.
What is farm diesel?
Off-road diesel, often known as farm diesel or diesel for agricultural purposes, is diesel that is not subject to on-road fuel taxes. Diesel fuel used for agricultural purposes is tax-free. Taxes can be avoided if diesel is burned on a farm and can be tracked. In Oregon, farms are able to obtain clear diesel without paying any road fees. It is frequently coloured red to indicate that it is tax-free. Some farms may track their use of clear diesel so they can submit for Federal road taxes for off-road usage in Oregon, where P.U.C. for trucks over 26,000 GVW pay a weight mile tax instead of a per gallon state road tax.
What color is dyed diesel?
Every gallon of fuel sold in the United States contains some color. Diesel for on-road use usually has a slight green hue. This is a dye that is mixed into the fuel by either the refiner or the terminal supplier. Off-road diesels are coloured red to indicate that the fuel is tax-free and intended only for off-road use.
Why is diesel dyed?
Diesel is coloured to indicate whether or not it has paid road tax. In the United States, on-road diesel usually has a faint green hue. Off-road diesel is dyed red to indicate that it has not paid the required road taxes in all states and by the federal government.
What is off-road diesel?
Off-road diesel is diesel fuel that has been dyed red to indicate that it is tax-free and only available for off-road fuel uses such as construction fueling, equipment that is never used on a public road, agricultural use, heating oil, boiler fuel, and other non-taxed diesel fuel uses as defined by state and federal fuel tax laws. Some off-road users in Oregon can use the Oregon state tax exemption to buy on-road fuel if they have the correct papers.
Is dyed or off-road diesel flammable?
The National Fire Code classifies off-road diesel as a Class II combustible liquid. A flammable fuel has a flash point below 100 degrees Fahrenheit. The flash point of diesel ranges between 126 and 205 degrees Fahrenheit (typically assumed to be about 160 degrees F). As a result, it’s classified as a Class II combustible.
Is off-road diesel or dyed diesel high sulfur diesel?
Dyed diesel (also known as off-road diesel) contains a lot of sulfur. Diesel fuel having a sulfur level of more than 500 parts per million is known as high sulfur diesel.
Is off-road diesel or dyed diesel ultra-low sulfur diesel?
Off-road and colored diesel fuels may have ultra-low sulfur, however this is not always the case. In the United States, there has been a persistent campaign to reduce sulfur in all fuels, led by EPA regulation. Off-road construction and agricultural equipment have been required by EPA rules in recent years to have an emissions system that allows ultra-low sulfur to function without serious difficulties. As a result, today’s off-road diesel is ultra-low sulfur. If you have a tank with old dyed red diesel fuel in it, you can infer it has a sulfur concentration that is higher than ultra-low.
What is dyed ULSD fuel?
Dyed ULSD fuel is ultra-low sulfur diesel that has been dyed red to indicate that it is only intended for off-road or untaxed use. Heating oil, construction fuel, agricultural fuel, generator fuel, and other off-road uses are common uses for this type of fuel. The abbreviation “ULSD” stands for ultra-low sulfur diesel.
Is dyed diesel #1 or # 2 diesel?
Diesel that has been dyed can be either #1 or #2 diesel. Both fuels must include a red dye to prove that they are untaxed and cannot be utilized as on-road fuels.
Why does the government require diesel be dyed red?
“For two reasons, the federal government demands dyeing of untaxed diesel fuel and kerosene. To aid in the reduction of tax fraud by recognizing fuel that hasn’t paid excise taxes and to aid in the reduction of air pollution by identifying fuel that isn’t acceptable for use in highway vehicles.”
Is dyed diesel and off-road diesel kerosene?
Kerosene (which crosses as #1 diesel fuel) can be found in dyed diesel and off-road diesel, but it is not always the case. Do not mistake a dyed fuel for kerosene, which is a more uncommon fuel. Kerosene differs from #1 diesel in one way: it has been proven that it may be absorbed and taken up by a wick. All kerosene is classified as #1 diesel. Kerosene isn’t found in all #1 diesel fuels. Diesels that have been colored and off-road fuels are in the same boat. All coloured kerosene and off-road diesel are dyed. Kerosene isn’t the only coloured fuel.
Is dyed diesel and off-road diesel stove oil?
Stove oil is coloured diesel and off-road diesel. Similar to diesel, it’s usually a #1 or #2 stove oil. Stove oils, as opposed to diesel, had a slightly distinct set of specification problems in the past, which is why they were named “stove oils.” It was less precise when petroleum refineries distilled crude oils to make diesel range fuels than it is now with hydrocracking technology. The number of distillate range fuel requirements is significantly more concentrated today, thanks to both oil refinery technologies and EPA emission standards, in order to assure compliance with EPA and state rules. If your heating appliance requires stove oil, it will most likely require #1 stove oil or #1 kerosene. This product is supposed to produce less soot, making it better suited for use in a pot stove. Monitor and Toyostove thermostatically controlled direct vent heaters are the most current stove oil appliances in the United States.
Is off-road diesel bad for my truck?
It depends on the year of your truck, and we’re assuming you’re talking about red diesel fuel. To begin, it is illegal to use dyed diesel, off-road diesel, or heating oil in an on-road vehicle. If you are found in Oregon, you might face a punishment of up to $10,000, and the state is very aggressive in pursuing tax evasion. Beyond the usage of off-road fuel, which is legal. On the west coast, coloured diesel is often ultra low sulfur fuel. This means that if it’s burned in your engine, it won’t cause any problems. It may be high sulfur or low sulfur fuel, depending on the age of the colored fuel or whether it is genuinely a heating oil. If you use that fuel in a post-2007 engine with a particle trap, you’ll have major maintenance problems.
Is dyed diesel or off-road diesel heating oil?
Yes, colored diesel and off-road fuel can be used to heat your home. These days, most dyed diesel and off-road diesel is ultra-low sulfur diesel. According to the EPA and most state rules, heating oil can have a low or high sulfur concentration. So, while heating oil cannot always be colored diesel (when used for off-road machinery or agricultural purposes), dyed/off-road diesel can always be used for heating oil and meet the requirements of heating oil furnaces.
Does off-road diesel freeze?
At low temperatures, off-road diesel gels. Wax crystals form and fall out of the diesel at lower temperatures, clogging filters and gelling the fuel. Water and naturally held-in diesel will also ice up, clogging filters. Diesel gelling is the term for this phenomena.
Does off-road diesel gel in cold weather?
If it gets cold enough, all diesel fuels will gel. Wax crystals and ice accumulating in your fuel will clog filters and cause your equipment to shut down. As a rule of thumb, if you don’t treat your diesel fuel, it should work OK above 20 degrees F. If the temperature drops below 20 degrees Fahrenheit, make sure your vendor treats the fuel for winter use so it can operate at -20 degrees Fahrenheit. If you’re going to be operating in temps below that, check with your vendor to see if they’ve tested the fuel to work in temperatures below -20 degrees F.
Does off-road diesel go bad?
Off-road and dyed diesel might deteriorate with time. All ASTM-compliant diesel fuels should be safe to store for up to a year without extra treatment or testing. If you’re storing diesel for a long time, it’s a good idea to treat it with a biocide and an oxidative stabilizer to guarantee that it stays within specifications and that nothing grows in your fuel tank. Water and dirt entering the fuel through a tank vent is the worst opponent of long-term diesel storage. A tank will breathe when the temperature changes, bringing in air and moisture from the outside. Keeping your gasoline within specification means making sure there’s no water in the tank and that no outside impurities can get in.
How long can I store off-road or dyed diesel in a fuel tank?
Diesel fuel has a one-year shelf life if left untreated. You can anticipate diesel to last two to three years if it is treated with a biocide to prevent biological development in the tank. When diesel is sampled after two to three years, it loses its brightness and begins to exhibit signs of age. After three years, you’ll want to sample and test the fuel to make sure it’s up to code and safe to use.
What is the difference between off-road diesel and on-road diesel?
The significant difference between the two fuels is the amount of gasoline taxes levied. To indicate that it is both ultra-low sulfur diesel and that the on-road fuel taxes associated with using it to power a highway vehicle have been paid, all on-road diesel is transparent or greenish in color. Fuel that has been dyed has not been taxed and cannot be used to power a vehicle on a public road.
Do you pay sales tax on dyed diesel or off-road diesel in Washington state?
Yes. The sales tax is assessed if you consume colored diesel and do not pay the on-road fuel taxes in Washington state. The sales tax is not paid if you use clear fuel with road taxes connected to it. The Washington Department of Revenue has more information about Washington gasoline taxes.
What are the taxes on dyed diesel or off-road diesel in Oregon state?
Your gasoline distributor pays a modest tax (less than $.01) on the fuel they purchase at the wholesale terminal. The US EPA Superfund cleanup and the “LUST” (Leaking Underground Storage Tank Cleanup Fund) are two of the taxes. Aside from that, there are no taxes on off-road diesel fuel in Oregon (federal, state, or local municipality).
Is there a way to buy clear diesel without a road tax on it?
In Oregon, you can purchase clear fuel that is exempt from state road charges. The following are the requirements for using clear diesel in Oregon without paying state taxes:
- cars with a legal Oregon “E” plate and registered to a US government agency, an Oregon state agency, or an Oregon county or city
- Vehicles or farm tractors/equipment that are only used on the roadway inadvertently, as specified in ORS 319.520
- Unlicensed vehicles or equipment that are utilized exclusively on privately owned property
What happens if I use dyed diesel in an on-road vehicle?
If you are caught in Oregon, you might be fined $10,000 each day. We’ve seen fuel tax evaders nabbed before, so be advised that Oregon is looking for any amount of dye in an on-road vehicle’s saddle tank. You will have maintenance concerns with your vehicle’s emission system if you use low sulfur or high sulfur fuel and your vehicle has a particulate trap.
Can you use dyed diesel in a diesel pickup truck?
Only if the pickup is solely for off-roading. If you plan to utilize that truck on a public road (even to cross a street) and colored fuel is discovered in it, state regulators can (and do) levy fines of up to $10,000 per occurrence. You can use off-road diesel as the vehicle’s fuel if you have a closed facility or a large farm and are not registering the vehicle for on-road use (thus the pickup must not leave the site). Any regulator observing dyed fuel in your vehicle will assume it’s an on-road pickup if you have license plates and it’s approved for on-road use.
How does the government test if someone used dyed diesel?
Typically, regulators may take a sample from the tank or spin the gasoline filter to look for obvious dyed fuel when checking for illegal usage of dyed fuel. If the fuel is clear (or even slightly pink) and they suspect dyed fuel was used in the car, they can use a special black light to show that dyed fuel was in touch with the vehicle. They’ll beam the light on the gasoline filter, the fuel tanks, and other portions of the engine compartment that may have come into contact with the fuel. They will cite the vehicle operator if they detect even a minor trace of the red-dye used in off-road fuel in specific regions. On the internet, there are kits for filtering dye out of gasoline to eliminate the color. Those kits won’t be able to remove enough dye to keep these lights from detecting it.
Why is off road diesel illegal for pick up trucks to use?
Off-road diesel is painted red to indicate that on-road fuel taxes have not been paid or that the fuel is tax-free. Fuel taxes for on-road fuel usage are levied by the federal government and state governments to help pay for the roads we all use. Fuel taxes are deductible if you use diesel for non-road equipment, machinery, or heating/boiler uses, and the fuel is coloured to make its tax-free status obvious. In a roadside or site level inspection, regulators can also shine a black light on certain parts of a vehicle’s system to see if colored gasoline is being used illegally.
What is the difference between dyed diesel and heating oil?
What’s going on in the Pacific Northwest right now? Typically, nothing. Diesel-colored heating oil is used. To reduce the overall cost of the fuel, most petroleum distributors sell the mainstream colored diesel grade for use as heating oil. Heating oil and dyed diesel have varied ASTM requirements depending on where you acquire it. Because furnaces and boilers can manage dirtier, lower-quality fuels than off-road equipment with a particle trap, heating oil specifications have larger tolerances than diesel criteria. Although heating oil is always a diesel fuel, dyed diesel for off-road machinery may have a distinct specification. In Oregon, for example, any dyed diesel fuel used in off-road equipment must include at least 5% biodiesel or renewable diesel. Heating oil and boilers are excluded from the biofuel mandate. Heating oil, on the other hand, can be free of biodiesel, while off-road diesel for machinery cannot.
Can refrigerated trailers or “reefers use dyed diesel even if they are attached to a truck moving it on the highway?
Refrigerated trailers are, in fact, off-road vehicles. Because its engine is not pushing something along the road, the diesel-fueled refrigeration trailer is considered off-road equipment. Any ultra-low sulfur diesel fuel can be used in these trailers (dyed or clear). If you use on-road clear fuel in a refrigerated trailer and keep track and verification of the on-road fuel used in the off-road piece of equipment, you can get your fuel taxes returned. However, proof is required, so speak with your CPA or accountant.
Is #2 diesel the same as off-road diesel?
Off-road diesel is less expensive than on-road diesel since it is not utilized in vehicles that go on roadways. An excise tax is levied on on-road diesel.
Although there is no performance difference between the two forms of diesel, off-road diesel is less expensive for enterprises who operate off-road vehicles. You can use on-road diesel in off-road vehicles, but you’ll be paying state and federal taxes on the gasoline that you don’t need to.
What is #2 diesel?
The most common diesel fuel grade is #2, which is widely available at most gas stations throughout the world. This chemical composition contains the most energy components and lubricating qualities in a single blend and provides the best fuel performance currently available. The majority of scientists agree that #2 diesel fuel will safeguard injection pumps, seals, and other critical engine components.
Because it does not require the same level of refinement to create for sale, #2 is usually less expensive than #1. The disadvantage of #2 diesel is that it has a tendency to thicken into a gel when the temperature drops. During the winter, this frequently leads to sluggish starts and other issues.
What is the difference between #1 and #2 diesel?
The fundamental difference between Diesel #1 and Diesel #2 is the cetane rating, which, like the octane of gasoline, indicates igniting ease. It’s all about fuel efficiency, volatility, and seasonality, really.
Less wear on your engines’ batteries implies a faster and more efficient start. The increased cetane grade also helps diesel engines run more smoothly by lowering maintenance requirements.
The additional lubricants in Premium Diesel assist keep fuel system parts moving easily. The fuel pump’s and other fuel system components’ lives are extended as a result of the reduced friction.
Fuel systems can become clogged with sediments and other particles over time. While the engine is operating, detergents are injected to Diesel #1 to clean injectors and other fuel system components. Not only does a clean fuel system last longer, but it also enhances fuel efficiency and horsepower production.
Diesel #1 contains lubricants and detergents, as well as other fuel additives that improve engine performance and save downtime. Even in a well-sealed fuel system, air moisture can find its way in and cause major engine problems. Demulsifiers in premium Diesel work to separate emulsified water from the fuel so that it can be filtered out; even in a well-sealed fuel system, air moisture can find its way in and cause major engine problems. Corrosion inhibitors keep rust and corrosion at bay, while stabilizers keep blockages and buildup at bay.
Diesel #1 is sometimes known as winter diesel since it operates better in colder conditions than Diesel #2. It has a lower viscosity and does not gel when exposed to cold temperatures. Most stations sell a premium Diesel blend that is tailored to the local climate.
While premium diesel has a number of advantages, such as fewer maintenance and equipment downtime, regular diesel is less expensive at the pump, which is an essential consideration. However, total cost of ownership should take into account not only the cost savings from the fuel, but also the impact on ongoing maintenance costs. The age and size of your fleet may play a role in deciding between Diesel #1 and Diesel #2.
When deciding between Diesel #1 and Diesel #2 for your fleet, keep in mind that premium Diesel quality differs from station to station. If you choose Diesel #1, make sure your drivers get their fuel at reliable high-volume stations.
Do you want to learn more about the effects of diesel choices on fuel systems? To talk with an equipment professional, contact your nearest Papé Kenworth office now.
Is on-road and off-road diesel the same?
On-road and off-road diesel fuels have the same chemical composition. On-road diesel, commonly known as clear diesel, is available at your neighborhood gas station. Off-road diesel is dyed red and supplied in quantity through wholesalers. Color, price, and intended usage are the only differences.
Can you mix off-road diesel with regular diesel?
No, your truck will be alright on this diesel. The main variation is in color, not in the components. It’s strictly for off-road use, as indicated by the red colour. It’s coloured red to make it visible to government officers if you’re using it illegally. Be aware that if you’re discovered driving on US highways, you could face a ticket and a hefty fine.
Off-road diesel will run your automobile if it runs on diesel. However, as previously said, if you use it illegally and are detected, you will be penalized by both the state and federal governments. Because that is sometimes the only fuel available in the event of a natural disaster, you are unlikely to be penalized.
Technically, you can, because the color is the only difference. We’ve heard of cases where someone bought a truck that ran on off-road diesel and then switched to regular diesel. In that situation, the new owner just switched to regular diesel and the vehicle performed admirably.
The distinguishing red dye is the most noticeable variation, and there may also be a difference in sulfur levels. Furthermore, because this agricultural fuel is designed for heavy machinery, it heats up quickly.
Driving until the tank is completely empty is the simplest way to get rid of the red dye. Then pour in a couple gallons of or normal diesel and let it run for a while. Repeat this process numerous times. If you want to be sure it’s gone, have your repair flush the gasoline system.
No, it isn’t possible. Except for the colour, it’s identical as on-road diesel. If you have a diesel engine, you can use farm fuel to power it. Just make sure you’re not breaking any laws when you use it.
Some people believe it is “tax-free,” but depending on the state, it may or may not be. Here’s a list of states with information on gasoline tax exemptions. When you’re permitted to use this type of fuel off-road, you’ll either pay less at the pump or get a refund on your fuel tax.
You could be charged with “Motor Fuel Tax Evasion” if you’re caught and convicted. Is it really worth it to save money on gas? Here’s what the IRS has to say about it:
“What are the Consequences?” In general, no coloured fuel should be used in highway vehicles. The Internal Revenue Code stipulates a penalty of $1,000 or $10 per gallon, whichever is larger, with payment of the tax for each violation. Additional fines may be imposed by states.”
Mixing the two types of diesel fuels is not a problem, however red diesel has a higher sulfur level than green. It’s also known as green fuel because it’s environmentally beneficial. It’s either light green or transparent in appearance.
This is subject to change. If you’re unsure, you can dip a tube in your tank and pull out a sample to see what color it is; there are also manual dipstick kits and black lights available. However, the gas does not remain in your tank; it passes through your fuel system. If you’re worried, take it to your mechanic to have the system flushed.
Is diesel better for off roading?
Off-roading is a sport that is rapidly gaining in popularity! With this gain in traction, concerns about the usage of diesel for off-roading, particularly the discussion comparing diesel and gas cars, have grown louder.
Diesel cars are better overall when it comes to off-roading because of their torque, power, longevity, efficiency, mile range, fuel economy, high weight carrying capacity, and safety features, despite their high cost and upkeep.
While those are the main reasons why diesel is superior for off-roading, there are a few other considerations as well. Let’s dig further into all of the reasons for this in order to get a complete picture of diesel vehicles and their off-roading capabilities.
Is #2 diesel for winter?
The temperature of 2 diesel is around 14 degrees Fahrenheit. Switching to a winter blend 15 degrees above cloud point is a decent rule of thumb. When the overnight temperatures drop below 30 degrees F, it’s time to add No. 1 diesel with winter additives.
Can I use diesel #2?
Diesel#1 (or 1-D) and Diesel #2 are the two types of standard diesel fuel (also known as diesel oil) (or 2-D). Diesel fuel is rated by its cetane, which indicates how easily it is to ignite and how quickly it burns, similar to how gasoline is classified by its octane. The more volatile the gasoline, the higher the cetane number. The majority of diesel cars run on fuel with a grade of 40 to 55 octane. Because all diesel OEMs define Diesel#2 for regular driving conditions, you won’t have to worry about which type to use. Because Diesel #2 is less volatile than Diesel #1 and delivers better fuel economy, truckers utilize it to transport big loads over long distances at constant speeds.
Keep in mind that API (American Petroleum Institute) classifications for oils used to lubricate diesel engines are not to be confused with diesel fuel grade ratings.
Diesel fuel is also measured by its, which refers to its thickness and flowability. Diesel fuel, like any other oil, thickens and becomes cloudier as it cools. It can turn into a gel under extreme temperatures and refuse to flow at all. Because Diesel #1 flows more easily than Diesel #2 at lower temperatures, it is more efficient. The two types of oil can be mixed, and most service stations offer diesel fuel that has been blended for the local climate.
Tip: If you’re going to drive in really cold weather, use diesel gasoline that’s rated at least 10 degrees colder than the coldest temps you’ll be facing.
For more information, consult your owner’s handbook.
Caution: Because emissions from conventional diesel gasoline have been discovered to be extremely hazardous to people and other living things, avoid inhaling the fumes while pumping it into your fuel tank until safer alternatives are developed. (The same may be said of fuel!)
Tip: Diesel gasoline supplied at truck stops is frequently less expensive than diesel fuel sold at service stations, and the fuel is also fresher. Freshness is vital since diesel fuel can readily become polluted by water vapor that condenses in fuel tanks, and truly dirty fuel can include fungus and other germs that can clog filters and fuel injectors, despite the fact that it’s rarely encountered in North America these days. Look for slimystuff on the nozzle of the fuel pump if you find yourself at a station that raises your suspicions. On a Saturday morning, when commercial trucking activity is low, try to fill up at a truck stop. The worst time to buy is on a weekday evening since cramming a little vehicle into a mob of huge rigs is difficult!
Biodiesel fuels made from agricultural waste have the potential to be a clean-burning alternative to decreasing petroleum supplies.
Rudolph HenryFord envisioned plant-based fuel as the primary fuel for transportation and cooperated with Standard Oil to develop biofuel production and distribution. Diesel’s original engine was built to run on peanut oil, and HenryFord envisioned plant-based fuel as the principal fuel for transportation. However, in the United States and Canada, the only form of biodiesel gasoline that may be used in automobiles without voiding the manufacturer’s warranty is B5, a blend of 5% biodiesel and 95% regulardiesel. Biodiesel blends of up to 30% work great in most diesel engines.
Higher mixes necessitate reprogramming the engine control unit’s (ECU) electronic fuel “mapping” system, which controls timing, fuel/air mixture, and other parameters. The reason for this is that, while a diesel engine that operates on diesel oil and a biodiesel-burning engine have no mechanical differences, biodiesel has somewhat different energy and burning characteristics than ordinary petroleum-based diesel.
Do-it-yourselfers and specialist shops in the United States have modified biodiesel vehicles to allow them to use greater biodiesel mixes and fuels made from a variety of substances. Biodiesel can be created from nearly any crop-based oil, and the news is full of stories of adapted automobiles that operate on biodiesel generated from french-fry oil and other restaurant waste, fresh-pressed cottonseed oil, and so on. However, some of these oils contain chemicals that can chew through gaskets and become rancid if stored for an extended period of time. Biodiesel can also dissolve deposits in fuel lines since it is a superior solvent than normal diesel fuel. While this may appear to be a beneficial thing, the deposits may clog gasoline filters and injectors as they flow through the fuel system. As a result, regulatory rules for biodiesel fuel’s chemical composition must be in place before it can be widely used and before automakers will allow it to be used under warranty in anything other than highly diluted levels. This is something that should happen very soon.
Diesel engines should theoretically be able to run on kerosene, some airline fuels, biodiesel blends ranging from 5% to 100%, and home heating oil, however the crucial word here is “theoretically.” Theseoils should only be used in extreme circumstances in your vehicle. These oils’ refining, filtering, and blending standards vary greatly, and they can harm your engine, violate your warranties, and cause you a lot of headaches. Look for trucking firms, food processing plants, energy plants, hospitals, and farms if you run out of gas in a rural place. These establishments frequently have diesel engines on the premises, and a good Samaritan may be kind enough to give you some. If you can’t find any diesel fuel, borrow some home heating oil or purchase Jet-A fuel at a local airport as a last resort. These alternatives are compared to rottgut whiskey by diesel mechanics: they will get you there, but they aren’t the best for your system! Only drive on these fuels for as long as it takes to reach the nearest supply of appropriate fuel.
What temperature does #2 diesel gel?
This is the problem that diesel users are referring to when they talk about gelling. The cloud point, named after the white haze or “cloud” that emerges as paraffin wax crystalizes, is the temperature at which gelling begins. The cloud point of No. 2 diesel fuel is 14 degrees Fahrenheit.