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Old 27-07-2016, 20:09   #1
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Fuel tank

Wanna turn huge empty space under floor into a glassed in diesel fuel tank, is this feasible or not, also the space is 8-11ft long and18-20in wide and about a foot in depth, any other ideas would be appreciated, need better than factory 30 gallons for yanmar 3qm

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Old 27-07-2016, 20:53   #2
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Re: Fuel tank

If you do not do long cruises, so you would not need the storage space for rations, it would be a good spot for a fuel tank if it's in the longitudinal centre of the boat.
However, I would not fully glass in a fuel tank, because that would make the tank unaccessible for servicing and cleaning, or for draining of sludge and dirt or water (moisture or otherwise). Ideal would be to have a fuel tank accessible from the top or side (by manhole, the bigger the better) and from the bottom, for said draining.
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Old 27-07-2016, 21:04   #3
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Re: Fuel tank

It was never a storage area, cut some floor out chasing bad fiberglass and found it and storage ain't an issue, its a 35ft warrior finding all kinds of room as i explore during the remodel lol

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Old 28-07-2016, 13:28   #4
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Re: Fuel tank

consider a drop in stainless or bags. in the meantime store jerry cans of fuel there and buy a cheap transfer pump
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Old 28-07-2016, 13:41   #5
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Re: Fuel tank

Stainless tanks in the bilge can last as short as 6 years. and that's not sitting in water that's above that level. Go for plastic or something less corrosion prone. Avoid aluminum there too.
Another thing to think about is you can have too much fuel. It's mostly easy to find diesel. My boats with big tanks or several tanks ended up with old fuel sitting. In fact, on one boat I just abandoned a tank once it emptied. Of course if you are going the Northwest Passage or something like that than take a lot of fuel!
Right now you have... 400+ range?.... so maybe a premade plastic tank that fits your space adding a bit more...12-20 gals... is fine..
Here's a ~16 gallon one that fits your space:
http://tektankslimited.com/62-litre-...-300-376-p.asp
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Old 28-07-2016, 15:08   #6
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Re: Fuel tank

400+ ? On a yanmar 3g30 and 30 gal tank. Thats some sweet mileage. Is that ideal setting or average mileage for a 35ft boat

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Old 28-07-2016, 15:24   #7
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Re: Fuel tank

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400+ ? On a yanmar 3g30 and 30 gal tank. Thats some sweet mileage. Is that ideal setting or average mileage for a 35ft boat

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That's about what our range is with a 32' boat, and a 3 cyl kubota, same tankage
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Old 28-07-2016, 16:34   #8
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Re: Fuel tank

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400+ ? On a yanmar 3g30 and 30 gal tank. Thats some sweet mileage. Is that ideal setting or average mileage for a 35ft boat

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I averaged about 1/2 gal per hour/engine in my 42 cat with two 3GM30's in it. I suspect it was a bit higher usage though, as I ran the engine sometimes to recharge.
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Old 28-07-2016, 16:35   #9
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Re: Fuel tank

Man. My mileage estimates were way off lol. Ok, time to rethink cruise range cause after i finish sanding and painting bottom have to cruise upriver from louisville to ashland. On the ohio and don't plan on the wind helping very much lol

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Old 28-07-2016, 16:39   #10
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Re: Fuel tank

Well, a lot of factors. Keep track of your gallons, date, engine hours when you fill every time and you will know for sure.. "Fuel log"
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Old 28-07-2016, 16:54   #11
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Re: Fuel tank

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Man. My mileage estimates were way off lol. Ok, time to rethink cruise range cause after i finish sanding and painting bottom have to cruise upriver from louisville to ashland. On the ohio and don't plan on the wind helping very much lol

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Ok, going upriver you'll burn more fuel. Our max range is in calm no current conditions. Worst case scenario you might only get 200 miles to the tank.....


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Old 28-07-2016, 18:28   #12
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Re: Fuel tank

Still really good for 30 gallon tank

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Old 28-07-2016, 19:08   #13
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Re: Fuel tank

Never plan on MPG, Only work in Hours. A boat diesel will run at the set revs, normally being its most economic, these revs wont change if going up or down river or with or against current and wind but your speed over ground will.
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Old 28-07-2016, 19:13   #14
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Re: Fuel tank

Build the tank out of plywood. Coat with epoxy, add whatever baffles, fittings, inspection plates work for you. Light weight, cheap , durable (mine are over thirty years old), and custom fit to the location. Easy peasy.
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Old 28-07-2016, 19:50   #15
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Re: Fuel tank

I like that idea, its not an exact rectangle so plywood and epoxy will work great. And with size of cavity, might extend my fuel capacity to over 100 gallons , that would get me a long distance

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