Aircraft Fuel Systems Microbial growth is produced by various forms of micro-organisms that live and multiply in the water interfaces of jet fuels. Which of the following could result if microbial growth exists in a jet fuel tank and is not corrected? 1. Interference with fuel flow. 2. Interference with fuel quantity indicators. 3. Engine seizure. 4. Electrolytic corrosive action in a metal tank. 5. Lower grade rating of the fuel. 6. Electrolytic corrosive action in a rubber tank. a. 1, 2, 4. b. 2, 3, 5. c. 1, 5, 6.