How do I know if my fuel needs polishing?

Common signs include dark or cloudy fuel, frequent filter clogging, water accumulation in your tank, sludge buildup, equipment performance issues like hard starting or reduced power, and visible microbial growth (diesel bug).

How often should stored diesel fuel be polished?

For backup generators and long-term storage, we recommend fuel polishing every 6 to 12 months. High-turnover tanks like fleet fuel storage may need polishing annually. Call (800) 326-7097 for a customized maintenance schedule.

Does Hoffman offer mobile fuel polishing service?

Yes. Our fuel polishing rig comes to your location anywhere across the Gulf Coast including Alabama, Mississippi, Louisiana, Texas, and Florida. No need to drain or transport your fuel. Call (800) 326-7097 to schedule service.

What types of fuel can be polished?

We polish ultra-low sulfur diesel, biodiesel blends, gasoline, kerosene, heating oil, and aviation fuel (Jet-A). Our equipment handles all common petroleum fuels stored in above-ground and underground tanks.

Fuel Polishing Services

Professional Fuel Polishing Services Across the Gulf Coast

Contaminated fuel costs businesses thousands of dollars in equipment damage, unplanned downtime, and emergency repairs every year. Whether you store diesel for backup generators, fleet vehicles, or retail fueling, fuel degradation is not a matter of if — it’s a matter of when. Hoffman Petroleum Equipment now offers professional fuel polishing services across Alabama, Mississippi, Louisiana, Texas, and Florida to keep your stored fuel clean, compliant, and ready to perform.

What Is Fuel Polishing?

Fuel polishing is the process of removing water, sediment, microbial contamination, and other particulates from stored fuel through multi-stage filtration and conditioning. Unlike simply replacing your fuel filters, fuel polishing circulates your entire fuel inventory through specialized filtration equipment that restores fuel to clean, usable condition — often exceeding the cleanliness standards of freshly delivered fuel.

Over time, all stored petroleum fuels degrade. Diesel fuel is especially susceptible to water accumulation, microbial growth (often called “diesel bug”), oxidation, and sludge formation. These contaminants clog filters, damage injectors, corrode tank interiors, and can cause complete engine or generator failure at the worst possible moment.

Signs Your Fuel Needs Polishing

If you notice any of the following, your stored fuel likely needs professional polishing:

Water contamination — Free water at the bottom of your tank promotes corrosion and microbial growth. Even small amounts of dissolved water accelerate fuel degradation.
Microbial growth (diesel bug) — Bacteria and fungi thrive at the fuel-water interface, producing acidic byproducts that corrode tanks and create dark, slimy biomass that clogs filters and fuel lines.
Sludge and sediment buildup — Oxidation and thermal breakdown create sticky deposits that settle at the bottom of your tank, reducing usable capacity and clogging pickup tubes.
Frequent filter clogging — If you are replacing fuel filters more often than normal, contaminated fuel is the most likely cause.
Dark or cloudy fuel — Clean diesel should be clear and bright. Dark, hazy, or cloudy fuel indicates oxidation, water emulsion, or suspended particulates.
Equipment performance issues — Hard starting, reduced power output, excessive smoke, or injector problems often trace back to poor fuel quality.

Fuel Types We Service

Our mobile fuel polishing rig handles all common petroleum fuels:

Ultra-low sulfur diesel (ULSD) — The most common fuel we polish, used in generators, fleet vehicles, construction equipment, and retail dispensing
Biodiesel blends — B5 through B20 blends are particularly prone to microbial contamination and require specialized filtration
Gasoline — Stored gasoline degrades through oxidation and can accumulate water through condensation
Kerosene and heating oil — Long-term storage fuels benefit significantly from periodic polishing
Aviation fuel (Jet-A) — Critical applications where fuel cleanliness is non-negotiable

How Our Fuel Polishing Process Works

Hoffman Petroleum Equipment uses a systematic four-step process to restore your fuel:

Fuel Testing and Assessment — We begin by sampling your fuel and testing for water content, particulate levels, microbial contamination, and overall fuel quality. This baseline tells us exactly what we are dealing with and determines the filtration approach.
Water Separation — Our equipment first removes free and emulsified water using coalescing separators. Removing water eliminates the primary driver of microbial growth and corrosion.
Multi-Stage Filtration — Fuel passes through progressively finer filtration stages to remove particulates, sludge, and microbial biomass. We filter down to levels that meet or exceed OEM fuel cleanliness specifications.
Verification Testing — After polishing, we re-test your fuel to confirm it meets cleanliness standards. You receive documentation showing before-and-after fuel quality results.

Industries and Applications We Serve

Gas Stations and Retail Fueling

Contaminated underground storage tanks lead to customer complaints, dispenser problems, and potential liability. Regular fuel polishing keeps your retail fuel clean and your dispensers running smoothly. We work with station owners across the Gulf Coast to maintain fuel quality between deliveries.

Backup Generators and Emergency Power

Diesel generators that sit idle for months are the most common victims of fuel degradation. When a hurricane, power outage, or emergency hits, you need your generator to start on the first try. Scheduled fuel polishing ensures your emergency fuel is always ready. Hospitals, data centers, telecommunications facilities, and government buildings all depend on clean backup fuel.

Fleet Operations

Companies that maintain bulk diesel storage for fleet vehicles — trucking companies, delivery services, school districts, and municipalities — benefit from regular fuel polishing that reduces injector wear, improves fuel economy, and prevents costly breakdowns.

Construction Sites

Temporary fuel storage on construction sites is exposed to temperature swings, dust, and moisture that accelerate contamination. Our mobile polishing service comes to your jobsite to keep equipment running.

Marinas and Marine Fueling

Marine fuel storage faces unique challenges from humidity, salt air, and temperature fluctuations. We service marina fuel systems to prevent the contamination problems that leave boaters stranded.

Why Choose Hoffman for Fuel Polishing?

Mobile service — Our fuel polishing rig comes to your location. No need to pump out and haul away fuel.
100+ years combined petroleum experience — We understand fuel systems inside and out, from the tank to the dispenser.
Complete fuel system expertise — If we find tank issues during polishing, we can repair, replace, or upgrade your storage system on the spot.
Documented results — You receive before-and-after fuel quality test reports for your compliance records.
Gulf Coast coverage — We serve Alabama, Mississippi, Louisiana, Texas, and Florida from our Mobile, AL headquarters.
Equipment financing available — For customers who need ongoing fuel management solutions

Service Area

We provide fuel polishing services across the Gulf Coast including Houston, TX, New Orleans, LA, Biloxi/Gulfport, MS, Pensacola, FL, Mobile, AL, and everywhere in between.

Schedule Fuel Polishing Service

Don’t wait for contaminated fuel to shut down your equipment. Call Hoffman Petroleum Equipment at (800) 326-7097 or (251) 666-8994 to schedule fuel polishing service. You can also submit a service request online or contact us for a free estimate.

Whether you need a one-time fuel cleaning or want to set up a regular maintenance schedule, our team will develop a fuel polishing program tailored to your storage volume, fuel type, and usage patterns.