On Mon, 12 Feb 2018 05:08:44 -0800 (PST), Tim
wrote:

Bill
- show quoted text -
Got the last couple gallons out. Mostly water.

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How’d all that get in there anyhow?


===

Yes, that needs to be understood, otherwise it will happen again. It
sounds like it was a lot more than just condensation or ethanol phase
separation.

It could have been a bad fuel purchase, sometimes happens. More often
it's from a leak around the tank fill, possibly correctable with a new
O-ring.

We had something a little more exotic on our last Caribbean trip -
lots of symptoms of something going on, but no show stoppers thanks to
a good set of large Racor water separators. It was getting worse
however so needed to be solved. After doing a number of thought
experiments I figured out that it was likely the fuel cooler on the
return flow to the tank, something unique to large diesels. We had a
mechanic in the BVI pressure test the cooler and that turned out to be
the problem. Blind pig finds acorn on first try. :-)

We still had a lot of water in the port side tank however so had to
pay a fuel polishing service in St Martin to run it through a big
centrifuge: Lots of $$$ for that and about 40 gallons of discarded
fuel/water mixture.

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