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Your Position: Home - Energy - 5 Things to Know Before Buying diesel engine fuel system

5 Things to Know Before Buying diesel engine fuel system

Author: Liang

Mar. 07, 2024

As a tractor-trailer owner/operator it’s inevitable that you’ll need to take your diesel engine to be serviced. While having a certified diesel engine technician perform regular maintenance can help your truck run longer and more efficiently, it’s commonplace to experience diesel engine problems resulting from normal operation of the vehicle. The positive news is that your diesel service company should be able to easily fix several common diesel engine problems. Knowing the signs of these common issues can help you and your technician more easily identify and diagnose the diesel engine problem and find a fast and affordable solution.

Diesel Fuel Injector Issues

Because newer diesel engines utilize common-rail fuel injectors, which fire more often than older diesel engines, your newer rig is more likely to have worse wear and tear on injectors over time. A fuel injector that is worn out or tired can be difficult to diagnose, as your engine may still run fine. A common way to pinpoint a worn or cracked fuel injector is an extended period to crank your engine caused by weaker combustion. Additionally, some customers with bad fuel injectors may notice fuel dilution in their oil represented by a rise in oil levels. This derives from fuel draining from the fuel lines and rails back to the tank after engine shutdown.

Decrease in Power

Experiencing issues with decreased power at start-up or when accelerating is a common diesel engine problem. A lack of power can be caused by several issues such as a loose throttle linkage, dirty fuel filters, or fuel injector problems.

Bad Glow Plugs

Your diesel engine relies on glow plugs to ignite the fuel-air mixture, but if they go bad or you happen to install a defective on—your engine will have difficulty starting, especially when it’s cold outside. Outside of hard starting, having more than one glow plug go bad will make it even harder to start and cause extremely rough operation. Ensure that you buy premium glow plugs when replacing them, as the cheaper aftermarket glow plugs have been known to swell or even break causing costly piston-cylinder valve and/or head damage.

Fuel Contamination

Diesel fuel can become contaminated far more easily than gasoline due to its higher viscosity. Common fuel contaminates include water, soot, dilution, glycol, debris, and even microorganisms. Contaminants can find their way into your fuel through damaged caps, seals, or gaskets. Storing your diesel engine for long periods of time can also cause contamination, as will the weather. When contaminants penetrate your fuel system, it can lead to major engine problems and should be fixed as soon as possible.

Black Smoke

Heavy-duty, diesel engines are almost synonymous with smoke, as anyone who has driven by a diesel truck on the interstate can attest. While your diesel engine emanating black smoke can be simply a sign of over fueling, it can also be signs of more serious problems. If your diesel engine is continuously emitting black smoke, you should have your fuel injectors, air filters, valves, valve stem seals, and cylinder liners all checked to make sure there isn’t excessive wear and tear to these components. Having a technician perform regular preventative maintenance on your diesel engine will typically prevent these parts from failing.

Diesel Engine Repair and Maintenance

These are only a handful of the more common diesel engine problems that an owner-operator can experience while keeping a fleet on the road. At Certified Diesel Solutions, we service all makes and models of tractor-trailers from engine overhauls to drivetrain services and everything in between. If you experience any diesel engine problems, contact us today to schedule a certified diesel engine technician to diagnose and fix the problem. Give us a call at 865-964-6598 or contact us online HERE.

Inventor of the diesel engine, Rudolf Diesel, would be proud of the leaps and bounds technology has made in the last century. Diesel engines were engineered to take advantage of the high energy content and relatively low cost of diesel fuels. While diesel fuel can be very efficient and powerful, it has various properties that must be maintained in order for it to perform effectively in today’s modern diesel engines.

This blog post talks about the first seven characteristics in this list of fourteen. As we talk about these various properties it will become clear as to why you need to ensure your diesel fuel is safe and reliable for your engine:

  1. Heat Value
  2. Ignition quality/cetane rating
  3. Viscosity
  4. Sulfur content
  5. Water and sediment content
  6. Carbon residue
  7. Flash point
  8. Pour point
  9. Cloud point
  10. Active sulfur copper strip corrosion content
  11. Ash
  12. Distillation
  13. Specific gravity
  14. Winter Fuel issues

1. Heat Value

The calorimeter is a device used to measure how much energy a fuel provides when it is burned. Essentially, when a specific amount of fuel is burned you can measure the amount of heat generated in British Thermal Units or BTUs.

As a reference point:

  • The heat value of Number 2 diesel fuel is 139,500 BTUs per gallon.
  • The heat value of Number 1 diesel fuel is 125,500 BTUs per gallon, approximately 10% lower than that of Number 2.
  • By comparison, the heat value of gasoline is 124,500 BTUs per gallon.

A higher heat value equals more power generated by the engine which means it takes less fuel to do the same amount of work.

2. Ignition Quality and Cetane Rating

The cetane rating is a method to measure the ignition quality of a fuel. The more easily a diesel fuel ignites, and the manner in which it burns, impacts how an engine starts as well as its combustion roughness. Pure cetane, a colourless liquid hydrocarbon, has excellent ignition qualities and is rated at 100. The higher the cetane rating in diesel fuel, the shorter the delay is between the time the fuel enters the combustion chamber and when it begins to burn. Good quality diesel fuel with a high cetane rating has a lag time of approximately 0.001 seconds.

The rating requirements of cetane depend on several things including the engine size, design, load and atmospheric conditions. For example, engines that operate at higher altitudes or in a colder climate, demand a higher cetane fuel to start and operate efficiently. The typical cetane rating for No. 2 diesel would be 46 – 48 with No. 1 diesel typically between 51 – 53.

Note: Most filling stations do not provide the cetane rating for their customers. This is why it is so important or diesel owners to purchase their fuel from a reputable, busy station to ensure the quality and freshness of the fuel.

Note: While the recommended minimum cetane rating for modern diesel engines is 40, it is important to note that increasing the cetane rating above 48 is not recommended. It will not increase engine performance and could cause fuel knocking.

3. Viscosity

Viscosity is, simply stated, a way to measure resistance to flow. As the temperature increase, viscosity decreases. This is an important factor in the operation in modern High-Pressure Common-Rail (HPCR) fuel system equipped engines.

Low viscosity fuel produces a fine, atomized mist which improves its ability to mix with incoming air, encouraging a complete combustion for better power and lower emissions.

High viscosity fuel typically results in a heavier mist which can lead to hard starting and white smoke issues.

4. Sulfur Content

The sulfur content of diesel fuel has recently drawn a great deal of attention because of increased wear on the following components: pistons, rings, valves, and cylinders.

This increased wear is the result of the corrosive effects of hydrogen sulfide in the fuel, combined with sulfur dioxide (or sulfur trioxide), formed during the combustion process. The wear and tear is less serious under constant loads and during high–temperature operation.

Several after-market companies offer fuel additives to compensate for the lubrication lost by the reduced sulfur content (reduced lubricity) of the diesel fuel. If the quality of the fuel is questionable we suggest replacing it with fuel from a reputable source to ensure the fuel system components are not at fault.

5. Water and Sediment Content

Water and sediment in the fuel can also cause rusting and damage to fuel system components. High water content in diesel fuel may lead to iron oxide particles forming inside the fuel tank. This causes internal rusting of fuel lines, pumps and injection components, particularly when the engine is not in use.

This is especially noticeable with engines that have been stored for an extended period of time. Owners will say they engine ran great all season, yet when they took it out of storage in the spring they had to replace fuel system components because of rust and contamination issues.

6. Carbon Residue

Carbon residue is the black, sooty material that is left behind after diesel fuel is burned. The acceptable amount of carbon residue deposits depends on the engine manufacturer as well as the running conditions of the engine.

7. Flash Point

The flash point of diesel fuel is the minimum temperature at which the fuel must be heated before flammable vapour is produced, allowing ignition to take place. The lower the flash point, the higher the risk of explosion.

5 Things to Know Before Buying diesel engine fuel system

Part 1: 14 Characteristics of Well Maintained Diesel Fuel






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