Fuel polishing is the process of circulating stored diesel fuel through filtration systems to remove water, sediment, and microbial contamination without draining or replacing the fuel. It is typically needed for fuel stored over extended periods — such as backup generators, marine tanks, or reserve fuel systems — or as preventive maintenance before contamination causes engine or filter damage. As Dieselcraft USA’s Strategic Fuel Solutions Partner across the Middle East & GCC, ANKORZ provides access to Dieselcraft’s portable fuel polishing technology alongside its diagnostic test kits (DS-1, W-5, FCT-100), so operators in Saudi Arabia and the UAE can both diagnose fuel condition and act on it through one regional partner.

Fuel polishing can significantly improve fuel quality by removing contamination, sludge, water, and particulates through specialized filtration and water separation equipment. However, severely oxidized fuel may still require partial replacement depending on laboratory test results — fuel polishing restores fuel condition, it does not reverse chemical oxidation that has already progressed too far. The correct sequence is test first (water, sediment, microbial, oxidation stability), then decide between fuel polishing, partial replacement, or full replacement based on actual results — rather than polishing as a default fix without knowing what is actually wrong with the fuel.

Untreated diesel fuel may begin degrading within 6–12 months. Properly stabilized diesel can sometimes last 18–24 months, but fuel older than 2 years should always be tested for oxidation, water contamination, sludge, and microbial growth before use. This timeline is a general baseline; fuel stored in tanks exposed to temperature swings, moisture, or partial fill levels can begin deteriorating sooner — conditions common in Saudi Arabia and the UAE, where standby generators at hospitals, data centers, and industrial facilities often hold fuel for extended periods between activation.

Common symptoms of contaminated diesel fuel include: high fuel temperature alarms, frequent fuel filter plugging, dark or cloudy diesel fuel, black slime inside tanks, hard starting on generators, injector noise, generator shutdown under load, and water separator alarms. Any one of these signs on its own can have multiple causes, but their combination — particularly filter plugging alongside a temperature alarm — points strongly toward fuel-quality contamination rather than a purely mechanical fault. ANKORZ recommends treating any two or more of these symptoms together as a trigger for immediate on-site testing (water, sediment, and microbial checks) rather than waiting for the next scheduled annual test.

Yes. Old diesel fuel can oxidize, form sludge, collect water contamination, and restrict fuel flow. These problems increase injector return fuel temperatures and can trigger high fuel temperature alarms on generators and diesel engines — a warning operators in Saudi Arabia and the UAE should not dismiss as simply “hot weather,” since ambient Gulf heat compounds an underlying fuel-quality problem rather than causing it alone. Restricted fuel flow from clogged filters has the same effect: it forces the fuel system to recirculate heated fuel, further increasing return fuel temperature.

“Diesel bug” is microbial contamination in diesel fuel — bacteria and fungi that grow at the interface between fuel and water inside a tank, producing byproducts that clog filters, corrode tank surfaces, and reduce fuel quality. Since microbial growth cannot establish without water in the fuel, prevention starts with water control. Testing for microbial contamination with Dieselcraft’s DS-1 kit takes 24–36 hours to develop a reliable result. ANKORZ provides the DS-1 Fuel Microbial Contamination Test Kit for on-site sampling in Saudi Arabia and the UAE, combined with proper tank maintenance and periodic fuel polishing for stored fuel.

Match the system to the job size and duty. The FPS-HC15 is a compact, portable system for intermediate polishing jobs (rated 450 gal / 30 min, 65 lb dry weight). The FPS-400 is a modular system for jobs of 50 to 1,200 gallons (420 GPH rated flow). The FPS-30 is a stainless-steel system for 2,000-gallon and larger jobs (over 1,200 GPH). The FPS-400S is a stationary system for diesel storage tanks with a fire-resistant hose. Share your tank size, fuel type and site power with our technical team and we will confirm the right model against the current data sheet.

No. Dieselcraft fuel polishing systems are for diesel fuel only and are not for use with gasoline.

The standard FPS-HC15, FPS-400, FPS-30 and FPS-400S are specified with 115 V motors (the FPS-HC15 as 115 V / 60 Hz single-phase). Voltage and frequency differ across Saudi Arabia, the UAE and the wider Gulf, so please share your site power with our technical team before ordering so we can confirm suitability with Dieselcraft.

Businesses in Saudi Arabia, the UAE, and across the GCC can submit a Request for Quotation (RFQ) directly through ankorz.com to source Dieselcraft fuel equipment and related industrial products. ANKORZ sources from verified manufacturers and aims to return quotations within 24–48 hours, connecting buyers to trusted supply without requiring direct negotiation with multiple manufacturers.

Yes. ANKORZ is Dieselcraft USA’s Strategic Fuel Solutions Partner across the Middle East & GCC, operating from Saudi Arabia and the UAE with coverage extending to Oman and the wider Gulf and Arab world. Dieselcraft Fluid Engineering — a division of Magnum Group, in fuel and oil cleaning technology since 2002 — brings expertise across industrial, marine, and power generation applications.