In modern diesel generators, fuel quality is often overlooked even though it plays a major role in performance and longevity. Generators have evolved significantly to meet strict environmental and performance requirements, but diesel fuel stored for long periods has not kept pace. To support modern engine technology and prevent costly failures, owners and facility managers must ensure proper fuel filtration and polishing.
Leddy Power provides reliable diesel fuel polishing and filtration services in Moorpark to help keep your generator dependable for the long term.
What Are Fuel Filtration and Polishing
Diesel Fuel Polishing
Diesel fuel polishing is a proactive restoration process performed with an external polishing system while the generator is offline. The system draws fuel from the tank, circulates it through high-capacity multi-stage filters and water separators, and returns the conditioned fuel to the tank. This process removes water, sludge, microbial growth, and solid particulates, introducing clean, polished diesel back into the generator’s fuel supply.
Filtration
Filtration is the generator’s last line of defense against contaminants. It protects the engine only when the generator is running. If the stored fuel is significantly degraded, the on-board filters can clog quickly, causing power loss and potential damage to sensitive components.
Why the Service Is Needed
To understand why polishing and filtration are necessary, it helps to see how generator fuel systems have evolved. Older generators used mechanical fuel injection systems that operated at relatively low pressures, around 3000 psi. These systems had wider tolerances, so minor contaminants could pass through without immediate failure. Although these engines were rugged, they produced heavy exhaust and did not meet modern emissions standards.
Modern generators must comply with strict EPA Tier 4 requirements, and to achieve this, they use High-Pressure Common Rail (HPCR) systems. These systems often operate at pressures exceeding 30,000 psi. Injector components in HPCR systems have extremely tight clearances, sometimes between 1 and 3 microns. With tolerances this precise, microscopic particles or even a tiny droplet of water can cause scouring, seizing, or catastrophic injector failure.
This is why maintaining clean fuel is essential for generators that spend long periods with fuel sitting idle in the tank.
Factors Behind Fuel Contamination
Fuel can begin picking up contamination soon after leaving the refinery, but long-term storage inside a generator tank accelerates degradation. The most common contributors include:
Water
Water is one of the primary causes of diesel contamination. It enters the tank through condensation or during bulk delivery. Water contributes to rust in steel tanks and creates the ideal environment for microbial growth.
Microbial Growth
Bacteria and fungi thrive in the water layer at the bottom of the tank. They feed on the diesel’s hydrocarbons and form sludge that settles on the tank floor. These microbes also produce acidic waste that damages tank surfaces and causes filter clogging.
Asphaltenes and Particulates
As diesel fuel oxidizes with age, heavier molecular structures called asphaltenes begin to separate. These hardened clusters behave like sediment and create an abrasive layer similar to sand.
Advantages of Professional Filtration and Polishing Service for Diesel Generators
Regular diesel fuel polishing and filtration provide several important benefits:
- Improved generator startup reliability during outages
- Protection of expensive fuel system and engine components
- Maximum power output and cleaner combustion
- Reduced risk of unplanned downtime
- Prevention of costly repairs and premature failures
Electric Diesel Generator Services at Leddy Power in Moorpark
Leddy Power Systems Inc. is a single-source supplier of engine generators, transfer switches, and industrial engines in Moorpark, California. Leddy Power offers sales and service for diesel generators, gaseous generators, transfer switches, and industrial engine power packages. Services include after-sales support, future maintenance, troubleshooting, and fine-tuning.
Leddy Power supports commercial, industrial, healthcare, residential, military, marine, agricultural, oil and gas, wastewater, and government operations throughout the region.
You can find Leddy Power at 5435 Atlantis Ct., Moorpark, California.
