Diesel Fuel Sludging

Diesel fuel tanks are susceptible to contamination by a variety of bugs known as Hydrocarbon Utilizing Micro-organisms.

Vehicles most at risk of contamination are those that have poorly maintained fuel systems, fuel tanks that are subject to water contamination and those that are infrequently used.

Hydrocarbon Utilizing Micro-organisms enter fuel systems through vents or during the transport of fuel, forming thick, slimy mats that can block fuel systems and produce acids that attack components. These organisms can rapidly reproduce, with some varieties able to double in number every 20 minutes under the right conditions.

The most obvious warning sign of an infestation is persistent fuel line and filter blockage. Other problems can include corrosion of fuel system components and degradation of rubber fuel system components.

Treatment involves draining and steam cleaning of the tank and the addition of a biocide to prevent regrowth. The use of biocide alone is not recommended, as it can lead to fuel system blockage by dead cell material. Oil companies and fuel distributors can assist with the brand names of suitable biocides.

Failure to deal with contaminated or poorly maintained fuel systems or storage facilities will lead to recurring problems.