AXI International

Is `Dark Fuel` the same as `Bad Fuel` and can I still use it?

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Courtesy of Courtesy of AXI International

Algae-X FAQ’s

Is 'Dark Fuel' the same as 'Bad Fuel' and can I still use it?

This is a question many of us have asked more than once. And what we really want to know is: 'Will the stuff damage my engines?' Engines are expensive, ruining an engine is costly and operating an engine on 'bad fuel' is not wise.

We all know that most engine failures start in the fuel tank. When all mechanical parts are in good operating condition, the cooling and lube systems are working, the lube oil is clean and there is a sufficient supply of clean air getting to the combustion chamber, a diesel engine or turbine could almost run forever. The only limiting factor is Fuel Quality. Dark fuel is symptomatic of poor quality and even though, in most cases, it can be used, fuel in this condition will provide poor combustion and filtration problems.

'Dark fuel' is in general indicative of oxidation and that the process of fuel degradation is in a far advanced stage. Hazy fuel is indicative of water emulsified in the fuel. In general, dark hazy fuel will not damage your engine. It indicates however, poor fuel quality, which will definitely not provide you with peak engine performance.

Using less than optimal fuel quality negatively impacts engine efficiency and accelerates the process that makes new engines old.

Diesel fuel can range from colorless, to amber or light brown color, depending on the crude oil and the refinery process used to produce it. In addition, dyes may be added to change the fuel color for tax identification purposes.

In time, stored fuel will darken due to oxidation, repolymerization and agglomeration of certain components. The darkening is accompanied by the formation of sediment that plugs filters and causes poor combustion. Fuel & Oil vendors suggest that if diesel fuel is stored for emergency use, it should be replaced with fresh fuel within a year, unless special precautions or remedial actions are taken.

The university of Idaho conducted tests on the life expectancy of fuels to determine the timeline on degradation of stored #2 diesel. The results indicated 26% degradation after 28 days of storage. Disposing of Fuel and purchasing New Fuel is a very expensive proposition. Many larger companies, government institutions, hospitals, etc. have the dumping of fuel and the purchasing of new fuel as standard and accepted practice.

The implementation of ALGAE-X® Technology eliminates these costly, wasteful, and environmentally unfriendly dumping practices. ALGAE-X® will preserve fuel integrity almost indefinitely and can help you put in place good housekeeping measures along with a quality fuel-monitoring program. For more information feel free to contact us, or visit

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