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Boat Forum / Building / February 2008Sailboat fuel tanks
I am installing a new engine in my Morgan OI41. Since the main tank (mounted on the stbd side against the hull) was 30 years old I decided to replace it. Had to cut it out in 3 pieces which means that the replacement has to be made into 3 separate tanks. I realize that each of these tanks will need its own vent but I would like to connect the tanks so that I do not need separate fills and picks up. In other words I want to join them with a flow-thru at the bottom so that when I fill the first tank it flows into the other two. This means joining the tanks in some way. I have a tank builder (in Miami, Florida) who is proposing to connect them with 1 1/2 connectors. However he is unable to adequately explain how he proposes doing this I am hoping that someone in this group has had experience in replacing (and connecting) replacement tanks. Any suggestions will be appreciated. Joe > I am installing a new engine in my Morgan OI41. Since the main tank > (mounted on the stbd side against the hull) was 30 years old I decided [quoted text clipped - 14 lines] > > Joe Here's how I did mine. Small pic, but you can make it out: http://thumb17.webshots.net/t/48/49/6/91/27/2278691270068462757cYJhvB_th.jpg There are some very specific standards about the engineering of boat fuel systems. One rule i recollect is that, with the exception of diesel tank drains, all plumbing, whether for fills, vents, supplies or returns, should be to the top of the tank. I'd ask my insurer, or their favorite surveyor, which set of rules they prefer to go by. >I am installing a new engine in my Morgan OI41. Since the main tank > (mounted on the stbd side against the hull) was 30 years old I decided [quoted text clipped - 14 lines] > > Joe Quite a discussion on sail fuel tanks at rec.boats.cruising recently. Take a look at that thread, and post there as well. MW Please contact me off list. Lew On Feb 3, 3:16 pm, glud...@nospam.com wrote: > I am installing a new engine in my Morgan OI41. Since the main tank > (mounted on the stbd side against the hull) was 30 years old I decided [quoted text clipped - 14 lines] > > Joe I'm not sure why you can't put a single tank back in. A friend of mine had one built into a space on his boat. He had the welder measure it, build parts of it in his shop, place the parts into the area and welded it up in place. It worked fine, he pressure tested it as well, but would have had one hell of a job if he had a leak and couldn't get at it. John > On Feb 3, 3:16 pm, glud...@nospam.com wrote: > [quoted text clipped - 25 lines] > > John I would think twice about this. If you get a bad load of fuel all your fuel will be contaminated. While I am cruising I like to file one tank at a time just to make sure that I have something that I know runs. With all the horror stories you hear about bad diesel keeping it separate seems like a good idea to me. Joel On Feb 5, 10:04 am, JoelVannors...@gmail.com wrote: > > On Feb 3, 3:16 pm, glud...@nospam.com wrote: > [quoted text clipped - 35 lines] > > - Show quoted text - There is a section on this page about fuel tanks http://newboatbuilders.com/pages/fuel.html If this is a diesel then I would go with one tank, or two. Not three. The number of problems that can occcurs multiplies with the number of tanks. Gasoline tanks are required to have all fittings on the top of the tank. Diesel tanks can have fittings that aren't on the top but usually the only one is a clean out fitting at the bottom. If you cross connect the tanks you will need a fuel shut off in the pipe connecting them so you can isolate the tank. Both tanks should have seperate vents and fills because if you don't then the tanks can't be isolated. Being able to isolate the tanks is very important. If a tank gets contaminated you don't want it spreading to the other tank. The pick ups from the tank should be separate too but after a valve for each feed line, then connect together to form a single line leading to the filters and engine. Peter EIkenberry |
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