what's the deal with low sulfur diesel causing corrosion problems inside a fuel tank,been noticing a couple of our fuel caps are starting to get excessively rusty,but what was the clincher was the grandson called and said the 383 mf had shut off with him,i went to him and carried along a fuel filter,he told me it had plenty of fuel so I decided to have a look at the filter first even though it was less than a year old when I removed it I could hardly believe the rust,the filter itself had rusted the stem that holds the filter to the housing was even rusted all these parts stay submerged in fuel,what can be added to the fuel to prevent rust