Posted by Andy Martin on November 04, 2019 at 07:27:48 from (209.213.149.60):
In Reply to: Diesel fuel? posted by Geo-TH,In on November 04, 2019 at 03:26:10:
Lots of good answers, but nobody hit the nail on the head. Hot fuel straight from the refinery will have a few molecules of moisture in it which will settle out as the fuel cools. Even oil has the ability to hold moisture just like air.
As others have stated moisture can come through condensation, filling tanks during a rainstorm, cap left off on the transport tanker, etc.
In my opinion, the more fuel run through a truck stop the more water they will have in their tanks from the refinery. Conversely, the less fuel the more water they will have from condensation. You put a tell tale grease on gauging equipment which will turn pink when it contacts water. All fuel facilities drain water regularly. No tanks are water free but the goal is to keep it in the water well at the bottom.
But the crux is moisture is very bad for injection pump lubrication so all diesel engines have multiple water separation methods - trap, bowl, filter, etc. They may never get water in them but they still need to be there just in case. My Cummins has a water in fuel light which has not come on in 300,000 miles. If you are careful you won't need the water trap but you want it there.
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