I second that. Five mins with Google will show anyone that this is a well known, well understood and well published problem...
MICROBIAL CONTAMINATION OF STORED HYDROCARBON FUELS AND ITS CONTROL
http://www.scielo.br/scielo.php?scri...lng=pt&nrm=iso
Selected quotes..
"In aircraft fuel tanks, made of aluminum alloys, Hormoconis resinae can be a major problem causing corrosion and/or penetration of tank linings. Airlines are aware of this and regular testing is undertaken."
"As in most cases of microbial biodeterioration of materials, the best control treatment is prevention. Cleanliness and frequent drainage of water should ensure that problems are minimal. However, these standards are difficult to maintain in practice and it is not infrequent that storage systems have to be emptied for thorough cleaning (removal of biofilms) and biocides used. Corrosion induced in the tanks may be avoided by internal coatings, which will be effective for some years, but this is an expensive option, albeit one which is increasingly employed. Cathodic protection (impressed current or the use of sacrificial anodes) is also used to combat corrosion, sometimes in addition to resistant coatings. Although expensive, this may be less costly than the government-imposed fines which are levied in the USA against companies polluting the environment with leaked fuels. Such provisions, however, do not reduce the other consequences of contamination. Without adequate drainage, microbial slimes and sludges are likely to form in fuel systems and hence recourse to biocides may be necessary."