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Old 05-21-2016, 12:25 PM   #21
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Some PO of our sailboat changed out the Atomic 4 gas engine for a diesel. Used the same fuel tank. Disconnected the 'Gas' deck fill which was next to the tank vent on port. Added a 'Diesel' deck fill on the other side of the boat, left the tank vent on port.

Happily, no one put fuel into the disconnected 'Gas' deck fill before I foamed it full. Filling the tank requires the admiral watching the vent while I'm busy on the other side of the boat.

Must have been a reason to drill in a new fill rather than replace the cap or the fitting.
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Old 01-07-2017, 04:34 PM   #22
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I had an old chris Craft with twin detroit v8s. I never (after many, many hours of use,) ever saw water in my filter bowels. This was a 1973 boat with old tanks. I think these filters are designed to remove any bits of water in the fuel passing through. If you drain your water out of your tanks as best you can, i should think whatever is left will be handled by the filters. Will a little bit of water INSIDE rust a tank through? (I doubt it).

enjoy your boat!!
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Old 01-07-2017, 07:05 PM   #23
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Had a vinyl sign company make rings for my access ports. Red ,fuel, blue water,black for waste. Put around access and no more questions.
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Old 01-07-2017, 07:58 PM   #24
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Racor 500's do a great job of separating water out. I keep a spare on board with an elec fuel pump for polishing and I can use the pump to drain the tank if necessary.
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Old 01-07-2017, 08:33 PM   #25
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Greetings,
Mr. rb. Any amount of water IN the tank has the potential to cause rust as contact will be right against the steel/black iron. The amount left in the tank will depend on where the fuel is drawn from. If drawn from the bottom of the tank, most probably no problem at all. If drawn from a tube at the top of the tank there will probably always be water in the tank if contamination has occurred at some point.
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Old 01-07-2017, 09:45 PM   #26
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I think rust requires free oxygen (O2)?? Is there dissolved oxygen in diesel fuel? Interesting problem, but I do not think a little water in a tank full of diesel will rust an iron tank.
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Old 01-09-2017, 02:45 PM   #27
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Quote:
Originally Posted by rbrodehl View Post
I think rust requires free oxygen (O2)?? Is there dissolved oxygen in diesel fuel? Interesting problem, but I do not think a little water in a tank full of diesel will rust an iron tank.
I have an $8,000.00 yard bill that says otherwise.
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Old 01-09-2017, 04:06 PM   #28
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Originally Posted by Deckape View Post
Had a vinyl sign company make rings for my access ports. Red ,fuel, blue water,black for waste. Put around access and no more questions.
I like that idea!
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