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Fuel Contamination and Your Tank

Many belly/base tanks have structural walls (baffles) inside the tank, typically installed to support the engine weight above it.  These baffles inhibit proper fuel flow and obstruct complete tank access.  If a belly/base and a cylindrical tank hold the same amount of fuel, and a certain amount of water is added to the fuel, there will be a significant difference in the fuel/water interface surface area near the bottom of the tanks.  Microbes live in the water, but feed on the fuel, making rectangular tanks much more susceptible to bio-deterioration and localized water pockets.