Just to clarify the above, ‘diesel bug’ is not a problem with the diesel fuel, but rather an algae / fungal growth, in the water that is present within your tank. When a vehicle sits with a tank that is not completely full, condensation will form on the internal uncovered parts of the tank and it’s the water that attracts the bug, and gets dragged through the filters. I think the problem is less so with modern plastic tanks, butt there is usually some water present in underground diesel storage tanks. I had this in my old Landrover, and when I took off the filter, there were tiny black ‘worms’, (not actually worms, but thin strips of algae growth) so I changed the filter and added a special additive to the fuel in the tank, that’s smells quite strong, and that cured it.
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