Does the pump require external priming?

The integrated 1/3 HP spur gear pump is not self-priming. The system and all suction-side plumbing must be completely filled with fuel prior to initial startup to ensure the pump gears are fully wetted for safe operation.

STS 6000 SX-F Automated Fuel Polishing System with Smart Controller

Programmable Fuel Maintenance System

2.5 GPM Continuous Flow | 120/230 VAC Input | LG-X 500 Magnetic Conditioner

Fuel Polishing Systems · Automated Diesel Tank Cleaning · Compact Fuel Maintenance

STS 6000 SX-F Automated Fuel Polishing System (2.5 GPM)

Ensure the integrity of your stored diesel and bio-fuels with the STS 6000 SX-F, a compact, fully automated fuel maintenance system. Once installed and programmed, it operates independently, performing routine fuel polishing cycles to stabilize diesel and bio-fuels. By eliminating free water, microbial contamination (diesel bug), and solid particulates, the system extends equipment life and guarantees fuel readiness for mission-critical applications.

2.5 GPM Continuous Flow Rate

120/230 VAC AC Power Input

10μ / 30μ / 60μ SS Filter Options

Leak + Vacuum Alarm Auto Safety Shutdown

The STS 6000 SX-F is a programmed, closed-loop fuel maintenance solution designed to combat fuel degradation, microbial contamination, and water accumulation in storage tanks. Utilizing a multi-stage filtration process, the system draws fuel from the tank, passes it through a centrifugal water separator and magnetic conditioner, before returning clean, polished fuel. Its NEMA 3R-rated powder-coated enclosure allows for versatile installation in generator enclosures, engine rooms, or external tank farms. By automating filtration cycles, the system reduces manual maintenance, extends fuel storage life, and ensures generators and diesel engines have access to contaminant-free fuel during critical operations.

Key Features

The STS 6000 SX-F is purpose-engineered for facilities requiring autonomous diesel polishing with a reliable 2.5 GPM flow rate. Its hardware combination—a Smart Filtration Controller, continuous-duty 1/3 HP spur gear pump, centrifugal water separator, and LG-X 500 magnetic conditioner—delivers a robust system for maintaining bulk fuel quality. The programmable automation reduces manual oversight while the integrated alarm system ensures operators are alerted to leaks, clogs, or water accumulation.

Smart Filtration Controller (SFC50): The system is equipped with a programmable controller that allows operators to set up to three ON/OFF cycles per day for each day of the week. This fully autonomous operation ensures fuel is polished routinely without manual intervention, while the intuitive user interface and external monitoring integration provide complete status awareness.
Continuous-Duty 1/3 HP Spur Gear Pump with Viton Seals: The pump is designed for extended runtimes, moving fuel at 2.5 GPM across a viscosity range of 1–10 cSt. Viton seals ensure chemical compatibility with diesel and bio-fuels, while the coupled motor and pump assembly offers reliable performance and a long operational lifespan.
Primary Filter/Water Separator (Hydrophobic Media): The primary stage combines a centrifugal water separator and a hydrophobic filter element. Incoming fuel is spun around the vessel, forcing free water to drop into a collection sump, while the hydrophobic media repels entrained water to prevent it from reaching the pump. Available in 10μ, 30μ, or 60μ stainless steel screen configurations.
LG-X 500 Inline Magnetic Fuel Conditioner: Fuel passes through a powerful magnetic field which helps break down and de-cluster paraffin, asphaltene, and other contaminant molecules. This passive process stabilizes the fuel, improves combustion efficiency, and enhances the effectiveness of downstream water separation and particulate filtration.
Comprehensive Safety & Alarm Suite: The system integrates multiple sensors to prevent damage and ensure operator safety. A vacuum switch (setpoint 16″ Hg) protects the pump from running dry. A pressure switch (setpoint 22 PSI) prevents over-pressurization. A leak detection sensor and water detection probe provide immediate status feedback via the integrated alarm stack light.
Durable NEMA 3R Enclosure: The system is housed in a NEMA 3R-rated, powder-coated enclosure that withstands rain, sleet, snow, and ice. This rugged construction allows the STS 6000 SX-F to be confidently installed outdoors, in mechanical rooms, or within generator enclosures without risk of weather-related damage or component failure.

Applications

Standby Generator Set Enclosures: Long idle periods lead to water condensation and sludge accumulation. The STS 6000 SX-F installs directly inside the generator housing, running automated polishing cycles to ensure the engine receives clean fuel the moment a power outage occurs.
Industrial Fuel Storage Farms: For facilities storing bulk diesel for heavy equipment or boilers, the system provides continuous fuel conditioning. It reduces maintenance costs associated with emergency fuel replacement, filter changes, and unscheduled downtime due to contaminated fuel.
Marine Engine Rooms: The NEMA-rated enclosure protects against the high-humidity environments typical on vessels. The fuel polisher removes emulsified water and suspended solids that accumulate from condensation, preventing filter blockages and injector damage.
Remote Telecommunications & Off-Grid Power: For sites with limited maintenance access, the programmable automation eliminates the need for frequent inspections. The alarm stack light and external integration capability allow remote monitoring of system status, providing early warnings of contamination or clogged filters.
Airport & Municipal Refueling Depots: Fuel stored for seasonal or emergency use often sits idle for extended periods. The STS 6000 SX-F maintains fuel quality in holding tanks, reducing the risk of engine stalls and ensuring that refueling trucks, generators, and other fleet assets receive clean fuel.

Technical Specifications

Specifications apply to the standard STS 6000 SX-F fuel maintenance system. Primary filter cartridges are interchangeable. The standard-issue element is the 30μ particulate filter unless otherwise requested. At 50 Hz, nominal flow rate decreases from 2.5 GPM to 2 GPM.

Parameter	Specification
Nominal Flow Rate	2.5 GPM / 150 GPH (9.5 LPM / 567.8 LPH) (2 GPM / 120 GPH at 50 Hz)
Throughput — 8 Hours	Approx. 1,200 gallons (4,540 liters)
Throughput — 24 Hours	Approx. 3,600 gallons (13,627 liters)
Primary Filter Options	10μ or 30μ Particulate / 60μ Stainless Steel Screen with Centrifugal Water Separator
Secondary Filter Options	1μ, 3μ, 10μ, or 25μ Fine Filter / 3μ or 10μ Water Block Filter
Fuel Conditioner	LG-X 500 Inline Magnetic Conditioner
Pump Type	1/3 HP Spur Gear Pump (Continuous-Duty, Viton Seals)
System Controller	SFC50 Smart Filtration Controller (Programmable with Safety & Alarm Features)
Power Supply	120V / 60Hz / 1Ph or 230V / 50Hz / 1Ph
Plumbing Material	Black Iron with Anti-Corrosion Coating
Inlet/Outlet Ports	1/2″ NPT
Primed Suction Capability	15 ft. vertical lift or 100 ft. horizontal run
Fluid Viscosity Range	1 – 10 cSt
Operating Temperature Range	50 – 140°F (10 – 60°C)
Safety Alarms & Shutdowns	Leak Detection, High Vacuum (16″ Hg), High Pressure (22 PSI), High Water
System Enclosure	NEMA 3R Rated, Powder Coated
Controller Enclosure	NEMA 4 and UL508a Rated
Dimensions (H × W × D)	≈ 30″ × 24″ × 10″ (76 × 61 × 25 cm)
Weight	≈ 190 lbs (86.2 kg)
WARNING: Not for use with fluids having a flash point below 100°F (37.8°C).

Technical FAQ

Common Questions Answered

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The system operates at a nominal flow rate of 2.5 gallons per minute (GPM) or 150 gallons per hour (GPH) at 60Hz. At 50Hz, the flow rate adjusts to 2 GPM.

Yes. The system features a NEMA 3R-rated enclosure, providing protection against falling rain, sleet, snow, and external ice formation, making it ideal for both indoor and outdoor installations.

The STS 6000 SX-F removes free water, sludge, and solid particulate contaminants. The primary stage features a centrifugal water separator and hydrophobic filter, while the secondary stage utilizes a fine filter to ensure the fuel is polished and ready for use.

The LG-X 500 is an inline magnetic fuel conditioner that stabilizes diesel and bio-fuels. It helps break down natural fuel degradation compounds, improving filterability and combustion characteristics.

When primed, the system is capable of a vertical lift of 15 feet or a horizontal run of 100 feet of plumbing using the minimum recommended piping size with no additional restrictions. Any combination of vertical and horizontal runs will reduce the suction capability proportionally.

Regular maintenance includes checking and replacing the primary and secondary filter elements, draining collected water from the water separator, and inspecting the LG-X 500 fuel conditioner for debris. The system's smart controller provides visual alarms to indicate when service is needed, such as a high vacuum alarm signaling a clogged filter.