Fuel polishing is a mobile filtration process that circulates fuel out of a tank, through filtration and water-separation equipment, and back into the tank in a closed loop. It removes water, sediment, sludge, and microbial contamination from the fuel while it stays in place.

It depends on tank size, fuel condition, and access. Our equipment circulates fuel at approximately 30 gallons per minute depending on the application, so a straightforward job may take a few hours, while heavily contaminated or larger tanks take longer.

No — fuel polishing works with fuel in place. Full tank cleaning may involve drawing the tank down further to access sludge and sediment at the bottom, depending on the job.

In many cases, yes — filtration and water removal can bring diesel back to a usable condition. However, fuel that is severely degraded, chemically unstable, or has undergone phase separation may not be fully recoverable, and disposal may be the more practical option. We assess fuel condition before recommending a path.

It depends on how critical the equipment is and how long fuel sits without turning over. We can recommend an interval based on your equipment and usage. We don't present a fixed frequency as a legal requirement — check with your local authority having jurisdiction for compliance-specific intervals.

Yes. Water removal — both free water and emulsified water — is one of the primary things our filtration and water-separation equipment is built to do.

Yes. We build quarterly, semiannual, annual, or condition-based preventive maintenance programs around your equipment's criticality, including sampling, inspection, scheduled polishing, and written service records.

Fuel polishing filters the fuel itself. Tank cleaning goes further, physically removing accumulated sludge, sediment, and residue from the tank's interior, particularly the bottom. Many jobs involve both.

Yes, independent laboratory analysis is available in addition to on-site sampling, for documented, third-party test results.

In most cases, yes — fuel polishing is typically performed while the generator remains in place and available.

That comes down to fuel condition. Fuel mainly affected by water, sediment, or moderate contamination is usually a good candidate for filtration. Fuel that has become chemically unstable, phase-separated, or severely degraded may need to be disposed of instead. We assess and tell you honestly which situation applies before recommending a service.

Yes. Gasoline service involves additional considerations, including phase separation and ethanol-related moisture issues, and is performed with grounded, appropriately rated equipment.

Yes, we provide fuel-condition service for underground storage tank systems, working within the access points available for that tank configuration.

Yes, we provide marine fuel tank cleaning and polishing for boats, yachts, and commercial vessels throughout Southern California, including marina locations.

Waste fuel, water, and filtration byproducts are managed through appropriate disposal channels.