We remove water, sludge, sediment, and microbial contamination from stored diesel using mobile filtration equipment at your site. Fuel stays in the tank. No trucking. No fuel disposal. Serving Fairfield, Vacaville, Napa, and the North Bay.
Diesel fuel polishing is a multi-stage filtration process that removes physical contamination from stored diesel while the fuel remains in the tank. The fuel is drawn out, passed through filtration stages — coarse pre-filter, water separator, and fine particulate filter — and returned to the tank in a continuous loop until the fuel reaches target clarity and water content levels.
The process addresses contamination that accumulates in any stored diesel tank: water from condensation and humidity, particulates from tank rust and dirt, sludge from fuel degradation, and microbial growth at the water-fuel interface.
Unlike fuel replacement, polishing recovers usable diesel. Unlike in-tank additives alone, filtration physically removes contamination rather than masking it.
Most stored diesel tanks accumulate more than one type of contamination. Effective polishing addresses all of them in a single service visit.
Water enters stored diesel through condensation, faulty caps, and vent contamination. Free water settles to the tank bottom; emulsified water stays suspended. Both accelerate microbial growth and cause injector damage.
Fine rust, dirt, and tank scale circulate in diesel and collect on filter media. Particulate contamination scores injector tips and wears fuel system components over time.
Sludge is a mixture of degraded fuel residue, biological matter, rust, and sediment. It collects on tank bottoms and gets stirred up when the tank is disturbed or fuel is drawn down.
Bacteria and fungi grow at the water-fuel interface in stored diesel — often called diesel bug or diesel algae. Microbial growth produces acids, sludge, and filter-clogging biomass.
Diesel oxidizes over time, especially in partially-filled tanks exposed to air. Oxidation produces gums, varnish, and dark discoloration that reduce fuel quality and injector performance.
Start with a fuel sample and inspection. We tell you what we find before recommending any service.
Request Fuel TestAny of these signs in your equipment or stored fuel warrants a fuel inspection.
Ask us what we found in your tank before replacing fuel.
A fuel test is the right starting point.
Mobile diesel fuel polishing at your site. Request a quote or call to discuss your tank.