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I wonder about the inside of your fuel tank? There is a growth that can grow in your diesel tank and plug the strainer inside the tank. It's a black colored slime that is actually growing in the fuel.



Quite possible. As difficult as it is to believe, bacteria can grow in diesel fuel. There's plenty on the net about it. Here's somewhere to start:
http://www.dieselcraft.com/fuel-microbe-test-kits.php#.UJxLHcVWxBk