Using Fuel Treatment FT-10™ in Oil Furnaces, Boilers and Bulk Fuel Storage Tanks
Managing Moisture, Sludge and Deposits in Heating Oil and Bulk Fuel Storage
Originally published August 27, 2019. Updated September 15, 2026.
Fuel quality matters long before it reaches a burner, injector, or combustion chamber.
Heating oil, diesel fuel, and other petroleum fuels kept in storage for extended periods of time can accumulate moisture, sediment, oxidation products, gums, and other contaminants in the tank and fuel-delivery system. These conditions can contribute to restricted fuel flow, plugged filters, deposits, corrosion, and unreliable equipment operation.
Fuel Treatment FT-10™ is designed for use in petroleum fuel systems, including oil-fired furnaces and boilers and bulk fuel storage tanks. When added directly to the fuel, FT-10 helps maintain cleaner fuel-delivery components, disperses moisture, and adds lubricity as the treated fuel moves through the system.
Key Takeaways
Fuel Treatment FT-10™ can be used in oil-fired furnaces and boilers, as well as bulk fuel storage tanks.
Water, sediment, gums, sludge, and other contaminants can accumulate during fuel storage and interfere with reliable fuel delivery.
Bulk diesel storage is common for municipalities, fleets, farms, construction operations, emergency generators, and industrial equipment.
FT-10 helps clean and maintain the fuel system, disperses moisture, and provides added lubricity.
By controlling moisture in the fuel, FT-10 helps prevent the conditions that support fungi and bacteria growth.
Adding FT-10 before refueling or fuel delivery allows incoming fuel to blend easily throughout the tank.
Treating your fuel complements proper tank inspection, filtration, water removal, and equipment maintenance. It does not replace them.
Why Problems Develop in Stored Petroleum Fuel
Fuel doesn’t remain unchanged just because it’s stored in a closed tank. Storage conditions, temperature changes, tank condition, fuel turnover, and contamination all affect fuel quality.
Water, Condensation, Fungi, and Bacteria
Water is one of the primary conditions that allows microbial contamination to develop in stored petroleum fuel. Small quantities of bacteria, fungi, or fungal spores can be present in a fuel system, but active growth usually happens when free water is present, especially where the fuel and accumulated water meet at the bottom of a storage tank.
Once established, microbial growth can form slime and other deposits that contribute to sludge, filter plugging, corrosion, and restricted fuel flow.
Fuel Treatment FT-10™ helps prevent these conditions by dispersing moisture within the fuel instead of allowing free water to accumulate and create the environment that encourages fungi and bacteria growth. FT-10 is not a biocide; it works by helping control the moisture that allows microbial growth to develop.
This is especially important in bulk fuel tanks where diesel fuel or heating oil remain in storage for long periods of time.
Sediment and Tank-Bottom Contamination
Rust particles, dirt, degraded fuel, oxidation products, and other contaminants often settle at the bottom of a storage tank.
If this settlement is disturbed or drawn into the fuel delivery system, it can increase filter loading and restrict fuel flow.
Bulk tanks with long fuel storage periods or low turnover are particularly vulnerable because contamination can accumulate gradually without being noticed right away.
Gums, Resins, and Other Fuel Deposits
Petroleum fuels can form oxidation products and deposits during long storage periods, temperature changes, and repeated filling and emptying. These compounds can react further and form heavier materials, such as gums, varnish-like deposits, and insoluble sediment, which can collect in fuel lines, pumps, nozzles, injectors, and other fuel-system components.
Keeping these fuel delivery components cleaner maintains reliable fuel delivery.
Extended Storage and Low Fuel Turnover
Some stored fuel is consumed quickly. Other fuel might remain in a tank for weeks or months. Examples include fuel stored for:
Municipal road and public-works equipment
Seasonal equipment
Agricultural machinery
Construction equipment
Fleet vehicles
Standby and emergency generators
Industrial equipment
Oil-fired heating systems
The longer fuel remains in storage, the more important good tank housekeeping and fuel-system maintenance become.
Using FT-10 in Oil Furnaces and Boilers
Oil-burning heating systems depend on a consistent supply of clean fuel from the tank to the burner. A typical system moves fuel through the storage tank, fuel line, filter, pump, and burner nozzle before combustion occurs. Contamination anywhere along that path can interfere with reliable fuel delivery.
Here’s an illustration that shows the main components of an oil-burning furnace in the general order fuel, combustion, and heat transfer occur. It also identifies the blower compartment, where separate lubrication might be required for serviceable blower bearings.
Heating Oil Storage Tank
The fuel oil storage tank is the starting point for the entire fuel system.
Moisture, sediment, and sludge that accumulate in the tank can eventually be drawn toward the filter and burner system. Treating the fuel with Fuel Treatment FT-10™ helps maintain cleanliness and moisture control.
Significant free water or heavy sludge should be addressed through proper tank maintenance.
Fuel Filter and Lines
The fuel filter protects downstream components from contamination.
As dirt, sediment, and sludge accumulate, filter restriction can increase and fuel flow can be reduced. Fuel lines should also remain clean and free of water, sludge, and other restrictions.
Fuel Treatment FT-10™ helps dissolve and remove fuel gums and resins while maintaining cleaner fuel flow through the system.
Fuel Pump
The fuel pump must move fuel consistently to the burner.
Fuel Treatment FT-10™ cleans the pump and contains Muscle Metal Treatment MT-10® for added lubricity while the treatment circulates with the fuel. This can create higher efficiency and extend fuel pump life.
Burner Nozzle
The burner nozzle delivers the right amount and correct spray pattern of fuel for combustion. Deposits or contamination can interfere with proper fuel delivery and atomization. Keeping the fuel system cleaner supports the operating conditions the burner was designed to maintain.
Fuel Treatment FT-10™ circulates through the fuel system during operation and cleans deposits from burner-system surfaces, improving combustion and efficiency.
Combustion Chamber and Heat Exchanger
Consistent fuel delivery and proper atomization mean efficient combustion. A clean fuel system operating as it should and can reduce excessive oil soot and carbon accumulation, which helps keep the combustion chamber cleaner.
A clean fuel system can also provide a higher heat exchange, improving operation and BTU’s.
Blower Compartment
While FT-10 doesn’t treat the blower compartment, we do recommend Muscle Penetrating Oil SL-10™ to lubricate any serviceable bearings during maintenance.
Keep in mind, Fuel Treatment FT-10™ should be viewed as part of an overall fuel-system maintenance plan rather than a replacement for proper burner adjustment, nozzle service, filter replacement, or combustion testing.
Using FT-10 in Bulk Fuel Storage Tanks
Bulk fuel tanks are often used by municipalities, fleets, farms, contractors, industrial facilities, and other organizations that keep fuel on site for vehicles and equipment. A bulk storage tank might hold hundreds or thousands of gallons of fuel and can experience periods of low fuel turnover.
Diesel Fuel Storage
Diesel fuel stored in bulk tanks can be exposed to moisture, sediment, rust, oxidation products, and other contamination before it’s ever transferred to a vehicle or piece of equipment.
Once dispensed, contaminated fuel can move through the equipment's:
Fuel tank
Fuel filter
Transfer or high-pressure pump
Injectors
Combustion system
Treating the fuel at the bulk-storage level allows Fuel Treatment FT-10™ to travel with the fuel from the storage tank into the equipment using it.
Municipal and Fleet Fuel Storage
Municipalities and fleet operators often keep diesel fuel on site for trucks, road-maintenance equipment, loaders, excavators, generators, and other machinery.
This can be especially important for equipment that has to remain dependable during demanding operating periods, including winter road maintenance and emergency response.
FT-10 can be added directly to the bulk tank to help maintain fuel cleanliness, disperse moisture, and provide added lubricity throughout the downstream fuel system.
Agricultural and Construction Fuel Storage
Some farms and construction operations maintain on-site fuel tanks because equipment can be operated far from public fueling locations.
Seasonal use, outdoor tank placement, changing temperatures, and varying fuel turnover can all affect stored fuel.
Good fuel-management practices should include regular tank inspection, filtration, water monitoring, and treatment with FT-10.
Emergency and Standby Generator Fuel
Fuel for emergency generators can be stored for long periods of time between uses. Because the equipment is expected to operate immediately when needed, checking the stored fuel’s condition should be included in routine generator maintenance.
FT-10 can be one part of that maintenance program, along with tank inspection, filtration, water control, and periodic fuel quality evaluation.
How Stored Fuel Contamination Can Affect Equipment
Problems that begin in the storage tank don’t necessarily stay there.
Fuel Filters
Sediment and suspended contamination can increase filter loading and eventually restrict fuel flow.
Fuel Pumps
Diesel fuel pumps depend on clean fuel and adequate lubricity. Contaminants and poor fuel condition can contribute to wear and operating problems.
Fuel Injectors
Modern diesel injectors operate with precise clearances and spray patterns. Deposits or contamination can interfere with fuel delivery and atomization.
Combustion
Proper combustion depends partly on an accurate amount of fuel being delivered at the right time and in the correct spray pattern. Maintaining cleaner fuel and fuel-system components helps support consistent combustion performance.
How Fuel Treatment FT-10™ Works
FT-10 is added directly to the fuel. As treated fuel travels through the system, FT-10:
Disperses moisture
Prevents fungi and bacteria growth by dispersing the moisture they require to proliferate.
Dissolves and remove gums and fuel deposits
Keeps fuel lines, pumps, nozzles, and other components cleaner
Provides added lubricity
Maintains dependable fuel flow
Reduces conditions that contribute to fuel-system deposits
For oil-fired heating systems, FT-10 travels with the heating oil from the tank through the burner system.
For bulk storage applications, it travels with the fuel from the storage tank into vehicles and equipment.
Moisture Control in Fuel Storage Tanks
Moisture and significant quantities of free water should not be treated as the same problem. Fuel Treatment FT-10™ disperses moisture within the fuel so that it moves more uniformly through the system.
However, a fuel additive should not be used as a substitute for removing substantial quantities of free water from a tank. If inspection discovers significant water accumulation, heavy sludge, severe corrosion, or substantial tank-bottom contamination, the tank should be evaluated and serviced.
Cold Weather and Stored Fuel
Cold temperatures create additional challenges for heating oil and diesel fuel. As fuel temperature drops, viscosity increases and wax-related cold-flow problems can become more significant. This effects outdoor storage tanks, exposed fuel lines, and equipment used during winter weather.
This is especially relevant for:
Heating oil systems
Municipal snow removal equipment
Diesel fleets
Outdoor storage tanks
Emergency generators
Because FT-10 disperses moisture in the fuel, it helps reduce fuel-line freeze ups and rough operation caused by cold weather.
How Much FT-10 Should Be Added?
For oil furnaces, boilers, and fuel-storage tanks, the recommended treatment rate is:
Add 2 ounces of Fuel Treatment FT-10™ for every 10 gallons of fuel.
Whenever practical, add FT-10 to the storage tank before refueling or receiving a new fuel delivery. The incoming fuel blends and distributes FT-10 throughout the tank.
When a Fuel Treatment Is Not Enough
Fuel additives are useful maintenance tools, but they can’t correct every fuel-related problem.
A tank might need maintenance if it contains:
Significant quantities of free water
Heavy sludge
Extensive rust or corrosion
Severely degraded fuel
Excessive sediment
Repeated filter plugging
Depending on the condition, the work can include water removal, tank cleaning, filtration, fuel polishing, component replacement, or other professional services.
Treating a severely contaminated tank without first understanding its condition can move accumulated contamination downstream into filters and equipment.
Fuel Treatment FT-10™ Does Not Replace Regular Maintenance
FT-10 works best as part of a preventive maintenance program.
For oil-burning furnaces and boilers, regular maintenance should still include inspection and servicing of fuel filters, strainers, burner nozzles, fuel lines, and combustion components. Burner manufacturers specifically recommend checking for water, sludge, and restrictions during routine service.
Bulk fuel storage systems should also be inspected for water, sediment, corrosion, filter condition, and other signs of contamination.
Final Takeaway
Fuel quality affects the entire system that depends on it.
In an oil-fired furnace or boiler, problems in the storage tank will eventually affect filters, pumps, burner nozzles, and combustion. In a municipal, fleet, agricultural, industrial, or generator application, contamination in a bulk diesel tank can be carried downstream into the vehicles and equipment being fueled.
Fuel Treatment FT-10™ provides a way to treat the fuel at its source. By helping disperse moisture, clean fuel-related deposits, and provide added lubricity, FT-10 can be used as part of an ongoing program to maintain cleaner fuel and fuel-system components.
Recommended application: Add 2 ounces of Fuel Treatment FT-10™ for every 10 gallons of fuel in oil furnaces, boilers, and fuel-storage tanks.
Frequently Asked Questions
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Tank sludge can contain sediment, rust, oxidation products, fuel degradation products, water-related contamination, and other material that accumulates over time. Low fuel turnover and long storage periods allow these materials to build up and settle at the bottom of the tank.
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Water can enter through condensation, leaks, damaged fittings, tank vents, poor handling practices, or even contaminated fuel. Temperature changes also contribute to condensation inside partially filled tanks.
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Fuel Treatment FT-10™ disperses moisture in the fuel so it can move uniformly through the system. It should not be used as a substitute for physically removing significant quantities of free water that have accumulated at the bottom of a tank.
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Free water has separated from the fuel and collected at the bottom of the tank where it contributes to corrosion, sludge, microbial growth, and fuel-delivery problems.
Moisture is present as small droplets distributed throughout the fuel instead of forming a separate water layer. Fuel Treatment FT-10™ disperses moisture, but significant free water should be removed from the tank instead of relying on a fuel additive alone.
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Yes. Contamination originating from a bulk storage tank can travel downstream into equipment fuel systems. Filters normally capture a lot of this material, but excessive contamination can increase filter loading and eventually affect pumps, injectors, and fuel delivery.
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When practical, add Fuel Treatment FT-10™ before the tank is refilled. The incoming fuel blends with FT-10 easily.
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Fuel Treatment FT-10™ helps dissolve and disperse fuel-related deposits, but a heavily contaminated tank might need professional cleaning, water removal, filtration, or fuel polishing. An additive should not be expected to correct severe tank contamination by itself.
Related Links
Fuel Treatment FT-10™ Product details, uses, technical data, and application information.
Fuel Treatment FT-10™ Product data sheet
Contact Muscle Products Corp.