We test thousands of gallons of diesel
that is bacteria and fungal growth free but when we do find a sample that is contaminated the common element is water.
Maintaining a clean tank is not impossible just terribly difficult. I have pulled stainless welding tigs from fiberglass
tanks that was inherited from a bulk fuel delivery
. We find hundreds of foil seals
that come from the fuel additive bottles. And we get calls to pump out water that a new deck
hand accidentally dumped in the fuel. Then there is the gas station that just had a fuel truck leave prior to the boater pulling up. The gas companies are aware of the short comings and have adjusted to help minimize the heart aches but they still exist.
Bio-Diesel is becoming more available and they have been experimenting with ethanol blended diesel for you off-road users. You think we have problems now?