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Water can get into diesel fuel as a result of condensation, rainwater penetration or adsorption from the air — modern biodiesel is especially hygroscopic. The presence of water then encourages microbial growth which either occurs at the interface between the oil and water or on the tank walls, depending on whether the microbes need oxygen .
This fuel contamination, also known as 'fuel bugs', or 'diesel bugs', or 'so-called algae' build up over time in stored fuels if they aren't tested and treated on a regular basis. Fuel analysis should be undertaken before fuel polishing is commenced so that the exact contamination problem can be rectified with a targeted solution.
Volkswagen diesel sales in the US rebound, Clean Diesels win several environmental awards, receive tax breaks: 2013: International Council on Clean Transportation asks WVU CAFEE to help demonstrate the benefits of US diesel technology, hoping to have Europe follow suit: May 2014: Instead, CAFEE finds discrepancies showing poor on-road emissions.
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Wet stacking is a condition in diesel engines in which unburned fuel passes on into the exhaust system. [1] The word "stacking" comes from the term "stack" for exhaust pipe or chimney stack. The oily exhaust pipe is therefore a "wet stack". This condition can have several causes.
The ignition source of a diesel engine is the heat generated by the compression of the air in the cylinder, rather than a spark as in gasoline engines. The dieseling phenomenon occurs not just because the compression ratio is sufficient to cause auto-ignition of the fuel, but also because a hot spot inside the cylinder (spark plug electrode ...
Diesel engine runaway is an occurrence in diesel engines, in which the engine draws extra fuel from an unintended source and overspeeds at higher and higher RPM, producing up to ten times the engine's rated output until destroyed by mechanical failure or bearing seizure due to a lack of lubrication. [1]
The Volkswagen TDI diesel emissions case is not the first use of defeat devices by Volkswagen or other automakers nor the first time automakers have taken advantage of their foreknowledge of the specific lab test conditions in order to engage emissions controls only during testing, but not during normal driving. [65]