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Old 02-14-2013, 06:45 AM   #21
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"Dismantling the steel tanks in place is the route I would take as well. Poly tanks are easily sourced that could be mounted and plumbed in a design that actually increases the value of the boat."

Agree , as with multiple tanks the fuel management of running on one tank most times ,

and only filling the empty tanks at long cruise time , or for winter heat.
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Old 02-14-2013, 09:39 PM   #22
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Why not cut a hole in the side of the tank and put a fuel "bag" in the old tank. Then just put a plate over the hole in the tank?
Wouldn't this be the easiest solution??

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Old 02-14-2013, 09:54 PM   #23
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I actually thought if I lost one of mine I'd take the top of the tank from about 6" from the bottom out slab at a time and then use the remaining "tray" to hold the new poly tanks.
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Old 02-15-2013, 06:12 AM   #24
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"Why not cut a hole in the side of the tank and put a fuel "bag" in the old tank. Then just put a plate over the hole in the tank?
Wouldn't this be the easiest solution??"

A better built tank may have internal baffles that also will need to be cut out.
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Old 02-15-2013, 11:31 AM   #25
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FWIW:

We find most tanks have baffles around two feet apart.

You could try this...

Grand Banks fuel tank removal - YouTube
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Old 02-15-2013, 12:08 PM   #26
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Quote:
Originally Posted by El Sea View Post
Not in a million years would I feel good about jeopardizing the integrity of a fiberglass hull like that to get the fuel tank out. That seems nuts to me.
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Old 02-15-2013, 12:29 PM   #27
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Seems pretty clever actually. That area is pure glass. I guess you could replace the panel while the new tank is suspended from the ceiling? I'd be pretty cramped for room in the front to do the glass work properly.

I notice there's no re-install video.
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Old 02-15-2013, 02:04 PM   #28
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I watched a crew pulling tanks from an older GB straight up through the salon floor and then on up through a big hole they had cut in the roof. Whatever floats your boat...
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Old 02-15-2013, 03:42 PM   #29
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Older GBs like ours have a removable panel in the cabin overhead/flying bridge deck for the purpose of removing engines, tanks, etc. The teak decking and headliner have to be removed of course, but the panel is set up for easy removal and replacement.
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Old 02-15-2013, 04:41 PM   #30
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The removable panel on this one was hacked out with a sawzall.
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Old 02-16-2013, 12:50 AM   #31
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I was at the Miami boat show today and talked to ATL about this very subject.
They make foam filled bladders designed to go into your leaking rigid tank. You cut an access hole, and remove the baffels from the old tank. You remove the foam blocks from the bladder, work it into place and replace the foam blocks to give it shape. It looks like a very well made tank.
Here is a link to step by step drawings of the process: Retro-Fit Your Failed OEM Rigid Fuel Tank With A Flexible ATL Fuel Bladder!
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Old 02-16-2013, 10:25 AM   #32
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If anyone thinks it is easier to remove the baffles in a fuel tank, make the wall smooth and prep it for bladder type bag, they haven't a clue.
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Old 02-16-2013, 11:58 AM   #33
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Nobody thinks it's easy to grind those baffles out. I would imagine that you would pretty much have to crawl into the tank which means this isn't a good option for small tanks.

For small tanks you take the old tank out in pieces, put in the bladder and build bulkheads to support it. This avoids cutting up the boat to get the new tank in as the bladder will fold and go through much smaller holes than a rigid tank. If the tanks are used for gasoline, the foam prevents the tanks from exploding in a fire. It is the same foam used in race car tanks.

Another concern is the price. The bladders are not cheap. It might be cheaper to cut up the boat to get the new tanks in but that would need to be decided on case by case.

They no longer sell through dealers but back in the seventies I sold a lot of their fuel pillows. They were very well made back then and have been improved now. It was funny, a lot of the customers paid in cash with $20.00 bills and usually bought a number 410 chart as well. Never did figure out why.
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