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Diesel,as a fossil fuel, contains micro-organisms that can reproduce in both oxygenated (aerobic) and oxygen-free (anaerobic) environments, as well as a certain amount of water, due to its structure. It may cause the fuel to become unusable or cause equipment such as the generator fed from this contaminated fuel to not work/damage at the time of use. The Fuel Polishing process disables the microorganisms in the diesel and ensures that the fuel is stored in a clean and ready-to-use condition at any time with full performance. In addition, since it separates the water in the tank from the environment, it prevents oxidation in the tanks and extends tank life, reducing the need for periodic tank cleaning.
Why is Fuel Polishing Mandatory?
When you need to feed your electricity grid by starting your generator in an emergency, when you launch your diesel engine boat again in the summer season, or when you want to use the stored fuel in your truck or excavator, you may encounter an unpleasant and costly surprise. Stored diesel fuel causes sludge to form in the tank over time. and may damage your vehicles as soon as it is wanted to be used. Fuel polishing process not only protects your equipment from such damage, but it also prevents wasted fuel from being wasted.
Fuel polishing system, which can be designed for different storage capacities and does not require external command, and works with fully automation control. We eliminate your concerns about the quality of your stored diesel fuel.
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What Do We Offer?
By eliminating the bacterial content and neutralizing the remaining micro-fine particles, the infection simply cannot return; thus making Fuel Polishing Systems not only the most effective way to maintain fuel quality, but also environmentally friendly as no chemicals or biocides are used in this process.
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.