Re: Diesel Fuel Water Separarion
Thinking this through a couple of times finds me thinking that there may be a small bit less condensation in a gasoline tank. The actual condensation occurs on the exposed metal inside the tank (so it doesn't matter if there is gasoline or diesel fuel in the tank), however gasoline is more volatile, so the air space in a gas tank would have a lower % of water vapor containing atmospheric air as compared to a diesel tank (less volatile = less diesel vapor = more water vapor containing atmospheric air in the tank). That being said, once the condensation happens & the water droplets fall into the tank & settle to the bottom it can not evaporate out (because it is 'sealed in' by the fuel); so it doesn't matter that the diesel fuel & tank are warmed by the return line. --- Though as has been said, with the diesel tank being warmed while the engine is running, that is a time period during which condensation would not be occurring.
Of course maybe the rates of condensation are very different for a logical reason, this is just what I could rationalize.
Yes, diesel will have the water separators, so the recirculation of the diesel fuel will tend to filter out the water, but normally the pickup tube is above the bottom of the tank so you shouldn't be picking up the junk off the bottom to much, but that is different than which has less condensation.
