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Diesel does not stay clean in storage. Water condenses inside the tank, bacteria and fungi grow at the fuel–water boundary, and the fuel slowly forms sludge and sediment. When a standby generator, fire pump or vessel finally needs that fuel, the result can be blocked filters, damaged injectors or an engine that will not start. A fuel polishing system circulates the stored diesel, removes water and particles, and keeps the fuel ready to use. Less water in the tank also means less corrosion and fewer tank cleanings.
Why is Fuel Polishing Mandatory?
Think of the moments when stored fuel matters most: a generator starting during a grid failure, a boat engine after the winter, an excavator on a remote site. If the tank has collected water and sludge, that is exactly when the problem shows up. Polishing the fuel on a schedule protects the equipment and saves fuel that would otherwise have to be pumped out and disposed of.
Neftgen fuel polishing systems are sized to your tank volume and run automatically. Once set up, they start, circulate and stop on their own timer or on a signal from your control system, so no one has to remember to do it.
GALLERY
What Do We Offer?
We supply complete fuel polishing systems for generator tanks, bulk storage, day tanks and marine fuel tanks: pump, multi-stage filtration, water separation, automatic control and, where needed, tank connections and installation. The process works without biocides or chemical additives.
Application Video
Diesel Fuel Polishing Systems
Engineering-grade fuel conditioning for generators, critical power infrastructure, storage tanks and industrial fuel systems. Neftgen fuel polishing systems are designed for procurement and engineering decision-makers who cannot afford fuel-related downtime — hospitals, data centres, telecoms, ports, mining operations and energy companies across 20+ countries.
Why Stored Diesel Fuel Requires Active Conditioning
1. Ultra-Low Sulphur Formulations (EN 590)
Regulatory pressure to reduce emissions has driven sulphur content in diesel to ultra-low levels. Sulphur historically acted as a natural lubricant and biocide. Today's EN 590-compliant diesel is significantly more susceptible to microbial growth and oxidation in storage — making active fuel maintenance mandatory, not advisory.
2. Biodiesel Blending (B5, B7, B20)
Biodiesel blends introduce hygroscopic fatty acid methyl esters into the fuel matrix. They attract moisture. In long-term storage, this accelerates water accumulation, emulsification and biological degradation — a fundamentally different maintenance challenge than pure petroleum diesel.
3. High-Precision Injection Systems
Tier IV and Tier V diesel engines operate at injection pressures and tolerances measured in microns. Contaminated fuel that a previous-generation engine would tolerate now causes catastrophic injector failure, hard starting and power de-rating on modern critical standby generators. The cost of one injector rebuild exceeds years of fuel polishing maintenance.
How Neftgen Fuel Polishing Systems Work
A Neftgen fuel polishing system continuously circulates stored diesel through a multi-stage conditioning circuit, addressing three contamination categories simultaneously:
- Physical contamination removal: Centrifugal pre-filtration and depth filtration capture solid particles, rust, sand and sediment to sub-micron levels — achieving ISO 4406 cleanliness targets for modern injection equipment.
- Water separation: Free and emulsified water is separated and drained automatically via a dedicated Free Water in Fuel Sensor. No manual intervention required.
- Magnetic Fuel Conditioning: A magnetic stage disrupts the cellular structure of anaerobic and aerobic bacteria and fungi — preventing colony formation and sludge build-up without biocide chemicals. Combustion chemistry is fully preserved.
All models operate in Manual, Automatic and BMS-integrated modes. Control is via an LCD 7" touch screen. Data logging, trend monitoring and Ethernet remote access are standard across the full range.
Technical Specifications — Compact Series (DC & AC)
| Specification | EVG-PFS-010-24V DC | EVG-PFS-026-24V DC | EVG-PFS-010-220V AC | EVG-PFS-026-220V AC |
|---|---|---|---|---|
| Flow Rate | 10 L/min | 26 L/min | 10 L/min | 26 L/min |
| Voltage | 24V DC | 24V DC | 220V 50Hz 1ph | 220V 50Hz 1ph |
| Current Draw | 3A | 7A | 4A | 2.5A |
| Chassis | Polymer | Polymer | Polymer | Polymer |
| Dimensions | 700×650×300 mm | 1080×800×400 mm | 700×650×300 mm | 1080×800×400 mm |
| Pump Type | Gear | Gear | Gear | Gear |
| Weight | 25 kg | 42 kg | 25 kg | 42 kg |
Technical Specifications — Industrial Series (220V AC)
| Specification | EVG-PFS-040-220V AC | EVG-PFS-060-220V AC | EVG-PFS-120-220V AC | EVG-PFS-240-220V AC |
|---|---|---|---|---|
| Flow Rate | 40 L/min | 60 L/min | 120 L/min | 240 L/min |
| Voltage | 220V 50Hz 1ph | 220V 50Hz 1ph | 220V 50Hz 1ph | 220V 50Hz 1ph |
| Current Draw | 5A | 6A | 12A | 13A |
| Chassis | Polymer | Polymer | Stainless Steel Frame | Stainless Steel Frame |
| Dimensions | 1100×1000×400 mm | 1100×990×400 mm | 1750×1500×1200 mm | 2500×1500×1500 mm |
| Pump Type | Vane | Vane | Vane | Vane |
| Weight | 65 kg | 65 kg | 110 kg | 175 kg |
Standard Features — All Models
Available Options
Operational Benefits
Zero Unplanned Downtime
Clean fuel eliminates contamination-induced injector blockage — the leading cause of emergency generator failure at the critical moment.
Extended Engine & Injector Life
Reduced particulate load and zero water contamination dramatically lowers wear on high-pressure injection components rated to micron tolerances.
Lower Maintenance Costs
Proactive conditioning reduces emergency filter replacements, injector servicing intervals and tank cleaning frequency across the asset lifecycle.
Improved Combustion Efficiency
Fuel at ISO 4406 cleanliness burns more completely — lower black smoke, better fuel economy and stable power under full load.
Automatic Water Removal
Water is the primary driver of microbial growth. Continuous automated separation and drain cycles eliminate the contamination cycle at its source.
Full BMS / SCADA Integration
Native Modbus, Profibus, DeviceNet and CanBus communication minimises manual intervention and operator-induced errors.
No Biocides or Chemicals
Magnetic conditioning preserves cetane number, viscosity and calorific value — no additives, no chemical handling requirements on site.
Fire Pump Reliability
Fire suppression diesel pump units must start at maximum load instantly. Fuel polishing is a mandatory safeguard — not an optional upgrade.
Environmental Compliance
High cleanliness standards reduce contaminated fuel disposal risk — a regulated waste stream with significant compliance implications.
How to size a fuel polishing system
The main question is how long it takes to circulate the full tank volume through the system. A simple example: a 20,000 litre generator tank with a 60 L/min system needs about 20,000 ÷ 60 ≈ 330 minutes, or roughly 5.5 hours, for one full turnover. Larger tanks, fuel that sits for a long time, or tanks with a known water problem usually need a higher flow rate or longer run times.
To recommend the right model we ask for:
- Tank volume, number of tanks and whether they are above or below ground
- Fuel type (diesel, biodiesel blend, marine gas oil) and how long it is usually stored
- Where the suction and return connections can be made, and the distance to the system
- Power supply available on site (24V DC or 220V AC)
- Whether you need remote monitoring through your BMS or SCADA
- Whether the system will stand in a hazardous area
Frequently asked questions
How often should stored diesel be polished?
For standby generators and fire pumps, most sites polish on a regular schedule, for example a few hours every week, and test the fuel at least once a year. The right schedule depends on tank size, climate and how quickly the fuel is used.
Is fuel polishing the same as tank cleaning?
No. Polishing cleans the fuel while it stays in the tank. Tank cleaning removes sludge and sediment from the tank itself, usually with the tank emptied or nearly empty. A polishing system reduces how often a full tank cleaning is needed.
Can a fuel polishing system be installed on an existing tank?
Yes. Most systems are added to existing tanks using spare connections or a new suction and return line. We check the tank drawings or site photos before proposing a layout.
Do you also supply the tanks and generator fuel system?
Yes. Neftgen designs complete generator fuel tanks, day tank systems and tanker unloading units, so the polishing system can be part of one coordinated package.
Request a quote for a fuel polishing system
Send us your tank volume, fuel type and site location. Our team, which has delivered fuel polishing projects in several countries including Singapore, will reply with a recommended model and price. You can also write to info@neftgen.com or message us on WhatsApp.