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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Old 09-17-2013
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Diesel Fuel Tank Vent

I have a 40 gallon tank that has a vent hose about 3ft. long going from the top of the fuel tank to a vent in the cockpit. The line from the cockpit vent goes down a few feet with a small curve at the bottom and then up to the top of the tank. I have found water (and fuel) in the line and am wondering where the water is coming from. Is it condensation or is it coming from water at the vent. Like when washing down, rain or snow melt.
My question is would it hurt by making the line more into an S shape so that it curves up from the vent in the cockpit and then down and up into the tank. Or should I leave it alone and check and drain the line when I see moisture or should I.......
Thanks.
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Old 09-17-2013
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Re: Diesel Fuel Tank Vent

I had a case where the vent line vented to a fitting above the water line on the outside of the hull. The factory didn't put enough "rise" in the line and salt water got into the tank, resulting in a carburetor float bowl full of salt crystals. Discovered it about 10 miles out of the San Francisco Gate and luckily was able to limp home.

Suggest you put as much "rise" in the vent line above the vent outlet as you can get. If you have a "loop" configuration water or moisture may accumulate in the bottom of the loop and may eventually be sucked into the tank as the fuel cools and contracts.

Paul T
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Old 09-21-2013
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Re: Diesel Fuel Tank Vent

I just replaced my vent hose and took all the dip out of the hose that I could so the air could travel freely. This was to make sure that my high racor filter readings were not caused by a trap of fuel in the line. My vent exits on the outside of my coaming facing slightly to the aft. I put as much rise as I could in the line coming from the vent, a good foot or so. In my mind there should be no fluid in this line at all.

Scup
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Old 01-22-2014
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Re: Diesel Fuel Tank Vent

Diesel Fuel Tank Replacement Cal 2-29

Anyone have info on availability of replacement tanks for this boat? I'm planing to buy this boat and anticipating replacement of a tank with much surface rust.

Phil
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Old 01-23-2014
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Re: Diesel Fuel Tank Vent

Where are you? You can order tanks from PSC or you can have them made by a fabricator. There is a guy in Bellingham who makes nice tanks if you are in the PNW.
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