"R" == Rick writes:

R Steven Shelikoff wrote:
IOW, even if the pump is past the filter drawing fuel through it, the
filter is still in "pressure" mode because it's really the atmospheric
pressure pushing fuel through the filter.

R The difference is that if the pump suction pulls water and fuel
R directly from the tank it will do an excellent job of mixing it up to
R form an emulsion that will not filter out very effectively.


R The path should be, a basket strainer to catch the chunks, a
R separarator/filter to eliminate the bulk of the water and the smaller
R suspended particles, the pump, then the finer stages of filtration.


R This is all assuming you don't have access to a centrifuge which is
R really the best way to handle the process.


R Rick

Do you happen to know if there is any centrifugal separator on the
market suited to small boats? I cannot really think of any technical
reasons why not, but perhaps the market isn't there. Btw., I once had
a Scania truck diesel engine which had a centrifuge for its
lubrication oil. Judging from the amount of gunk it separated out of
the oil, it worked very well.

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