Learn about diesel fuel tanks, their storage capabilities, and what happens if DEF is added. Discover tips on diesel tank maintenance, storage, and how long diesel lasts in a tank.
Diesel tanks and their maintenance: everything you need to know


Diesel tanks and their maintenance: everything you need to know
What is a diesel tank?
A diesel fuel tank is an essential requirement in many industries. These are robust diesel storage containers designed for safe storage and dispensing of diesel fuel for use in machines and vehicles.

Diesel fuel tanks overview
Diesel tanks have an important role to play in powering vehicles, heavy machinery, and generators. Everyone, including fleet operators, farmers, and industrial businesses, is always looking for ways to save time and improve efficiency. With diesel tank based fuel storage, such operations can ensure their equipment can stay and operate longer at the job site.
Types of diesel tanks
Diesel tanks are available in different types, shapes, and sizes to address different requirements. The common options available on the market include:
- Above-ground tanks
- Underground tanks
- Self-bunded tanks
Every diesel storage tank has its own set of features and benefits.

Underground diesel tanks
When you have large diesel storage needs, especially in industrial settings, you should consider using an industrial diesel fuel tank. As the name suggests, these tanks are installed below ground level. They are available in the following material options:
- Steel
- Concrete
- Fiberglass
An above-ground diesel storage tank finds application in both industrial and commercial settings. Since it is placed on ground level, it is simpler to install compared to its underground counterpart. Common material options include steel and plastic. These tanks are also easier to maintain and repair due to their easy accessibility.

Self-bunded tanks
These diesel storage tanks, besides their industrial and commercial applications, are also used in the mining industry. These are self-contained and double-walled and designed for easy transportation. Common application scenarios include:
- Construction sites
- Agriculture operations
- Mine sites
- Emergency fuel needs

How long does diesel last in a tank?
It is a commonly asked question, how long does diesel last in a tank? If left to itself, diesel tends to get contaminated and degrade. If you can provide it with the ideal conditions, you can store it in a diesel tank for a period ranging from 6 to 12 months. Ideal conditions refer to the following:
- Following the NFPA 110 Standard
- Maintaining a cool temperature in the vicinity of 70°F
- Using stabilizers and biocides
Factors affecting diesel shelf life in tanks
Here is a list of factors that affect diesel fuel in a diesel tank for truck or diesel storage tank:
- Temperature: If the temperatures fluctuate at a fast rate, the stored diesel can degrade faster. Exposure to extreme temperatures also affects it. For example, the lighter components in diesel can evaporate in extreme heat and paraffin wax can crystalize in extremely low temperatures.
- Oxidation: Diesel can easily oxidize when exposed to air. Oxidation results in creating deposits within diesel, affecting its quality.
- Use of additives: When additives are added to a diesel fuel tank, they can reduce the effects of oxidation and microbial growth. Adding stabilizers and biocides can make diesel last longer.
Contamination: Diesel often gets contaminated due to being stored improperly. Moisture, debris, rust, and particulate matter can easily contaminate it and affect its usability. Exposure to moisture can cause microbial growth.

How long will 5 gallons of diesel last in an oil tank?
If you ask how long 5 gallons of diesel last in an oil tank, the answer is it can last from just a single day to a few days. The duration will depend on your home’s heating requirements and the weather. On an extremely cold day, the entire 5 gallons can get consumed.

DEF in diesel tank: what happens?
If you regularly deal with diesel fuel, you should know what happens if you put DEF in diesel tank. If you ever face a scenario with DEF in diesel tank, you should know what to do.
Understanding DEF (Diesel Exhaust Fluid)
Diesel exhaust fluid (DEF) is used in trucks to reduce emissions without affecting the vehicle’s power. It works on the principle of selective catalytic reduction or SCR to achieve this. DEF works by breaking down nitrogen oxide into nitrogen and water.
Besides being beneficial for the environment DEF also offers the following benefits for your vehicle:
- Improving fuel efficiency by promoting more efficient combustion
- Increasing your trucks’ power output
- Reducing maintenance needs by helping the engine run more efficiently. A more efficiently running engine experiences less wear and tear.

What happens if you put def in a diesel tank?
If you end up with DEF in a diesel tank, the fuel will become contaminated. The consequences can include:
- Fuel injector damage
- Fuel system clogs
- Engine failure in extreme cases
DEF fluid in diesel tank can cause the fuel to lose its lubricating properties and this can significantly increase the wear and tear on the engine parts.
Steps to take if DEF is added to a diesel tank
If you accidentally add 1 gallon of DEF in diesel tank or even less, you should immediately take the following actions:
- Do not start the engine
- Turn off the engine if it is already running
- Determine the amount of DEF in diesel tank
- If the engine is run after DEF is added, look for any symptoms of damage. Some of the signs of DEF’s effects can include power loss, warning lights turning on, and an increase in emissions.
- Flush the system, including the diesel tank, lines, and injectors.
It is recommended to have an experienced mechanic handle all these steps if you accidentally put DEF in a diesel tank.

Diesel tanks for trucks
Features of diesel tanks for trucks
Diesel tanks for trucks are designed keeping their placement in mind. They are usually side-mounted with the help of straps, brackets, or a combination of both.
The tank’s shape is affected by the fuel capacity requirements and often aesthetic preferences. The common diesel storage tank designs include:
- Rectangular
- Cylindrical
- D-style
Rectangular designs are usually preferred when there is a need to maximize fuel volume.
When it comes to the choice of materials, you can find a diesel tank option in:
- Stainless steel
- Steel
- Aluminum

Benefits of diesel transfer tanks for commercial use
The following benefits of using a diesel transfer tank can make it easier for you to understand how its use can add value to your operations:
Never get stranded without fuel
The longest stretches between gas stations can range from 100 miles to 200-plus miles. With a diesel transfer tank, you will never be caught in the middle without fuel. These tanks are available in both connected and standalone configurations.
Support remote operations
If your business operates from a remote location, using fuel transfer tanks can support your operations. You can effectively run your operations from where you are instead of having to purchase larger vehicles with larger tanks. Thus, using a diesel storage tank can help make your operations more cost-effective.
More predictable fuel costs
Accessing gas in remote locations usually tends to be more expensive. When you use a diesel transfer tank, you can fill tanks close to your business hub and at known costs. You can fill it out before setting off, which is beneficial for accurate budgeting.

Diesel storage tanks: best practices
When you invest in diesel storage tanks, it is recommended to take a few measures to ensure optimal usage.
Maintenance tips for diesel storage tanks
It is recommended to keep a diesel tank at a cool temperature and away from water. You should further use the following maintenance tips to extend its service life and usability:
- Prevent sludge build-up: Use products with biocide properties to keep the diesel free of bacteria. Left to itself, a diesel storage tank can build up biomass and sludge over time.
- Avoid water buildup: Water buildup can cause bacteria growth and affect fuel quality. Besides using biocides to kill bacteria, it is recommended to use ethanol to disperse water.
- Check fill points: If the diesel storage tank has a flexible line for extracting fuel, make sure to set up a drip tray. It should be stored within a safe, lockable cabinet. If the tank has permanently fixed vent pipes or taps, set them up inside a bund. If any oil escapes, it should land within the bund.

Ensuring long-term storage of diesel fuel
If you are going to store diesel fuel for a long time, you should use the following tips to increase its shelf life:
- Always use a clean diesel fuel tank. If it was previously used for storing oil, make sure to use a solvent to remove any residue after draining the oil.
- Filter old diesel. You can make old diesel last longer by filtering it before usage. This can help clean out any impurities.
- Treat the fuel to maintain its quality. Fuel treatment can stabilize diesel by preventing oxidation.
- Create an air-tight storage. Ensuring air-tight storage prevents additional factors from affecting the diesel’s quality. If the tank is not air-tight, water can enter, bacterial growth can take place, or the stored fuel’s temperature can be affected.
Regularly monitor the tank’s condition. Once you start using a diesel storage tank, make sure to monitor it regularly and clean it out after use.
Conclusion
Thus, there are many ways that you can benefit from the use of a diesel storage tank. The right storage tanks can help streamline your truck, fleet, or industrial operations by bringing greater reliability. When choosing the right tank, you should consider your needs and storage capacity requirements. It is also important to assess the tank manufacturer’s reputation.
Frequently Asked Questions
Diesel can sit in a tank for 6 to 12 months. The duration depends on the measures taken to preserve the fuel.
It is recommended to keep a diesel fuel tank as full as possible. If it is kept empty, when not in use, it should be properly cleaned and any debris should be removed.
It is recommended to clean a diesel storage tank once every year.
You should use the right biocides to prevent bacterial growth, avoid exposure to water, and check the fill points regularly to maintain a fuel tank.
It is recommended to clean a diesel tank with hot water and specialized detergent made to clean petroleum products.