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Does bilge water hit the bottom of a fuel tank on a below deck tank?

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Does bilge water hit the bottom of a fuel tank on a below deck tank?

Old 09-23-2018, 11:55 AM
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Default Does bilge water hit the bottom of a fuel tank on a below deck tank?

Or do they sit sit in such a way where that doesn't happen? This is on my 24ft abermarle.
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Old 09-23-2018, 11:58 AM
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Some tank compartments are walled off from the bilge. Some have drain holes so water that gets in can get out.
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Old 09-23-2018, 02:36 PM
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So how do you know which design you have without pulling the deck off?
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Old 09-23-2018, 02:56 PM
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Originally Posted by fishmaster273 View Post
So how do you know which design you have without pulling the deck off?
You'll know when you smell gasoline in the bilge one morning.
I had that problem with a 1997 Glacier Bay 252 - had to cut the deck and replace the tank.
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Old 09-23-2018, 04:07 PM
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Originally Posted by DaveHNL View Post
You'll know when you smell gasoline in the bilge one morning.
I had that problem with a 1997 Glacier Bay 252 - had to cut the deck and replace the tank.
so am i going to to have 100 gallons of fuel draining out of the bilge one day? Or is it a slow leak?
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Old 09-23-2018, 04:28 PM
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Originally Posted by fishmaster273 View Post
so am i going to to have 100 gallons of fuel draining out of the bilge one day? Or is it a slow leak?
Mine was a pinhole - so small, I never figured out where it was.

When I replaced the tanks, I laid down some 2" x 1/4" strips of that white cutting board material so the tanks wouldn't be resting on water.

When they cut the rectangular holes out in the deck, they were cut at an angle, so they popped back in, then grinded around the perimeter, glassed them back in, then I painted the whole deck in a light grey and added some non-skid. once it was finished, you couldn't tell anything had been done.

Last edited by DaveHNL; 09-23-2018 at 04:45 PM.
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Old 09-23-2018, 05:16 PM
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Stern side lower part of Boston Whaler 23 Outrage sit in the water with twin F150.
Unpainted aluminum fuel tank got pitted there and leaked fuel in the bilge. Not cool!
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Old 09-23-2018, 05:45 PM
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Originally Posted by ChrigelKarrer View Post
Stern side lower part of Boston Whaler 23 Outrage sit in the water with twin F150.
Unpainted aluminum fuel tank got pitted there and leaked fuel in the bilge. Not cool!
Chris

I wonder if you could Bedliner the tank to prevent corrosion.
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Old 09-23-2018, 06:30 PM
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Yes you can, but humidity may creep in between and you will not notice damage. Properly primed and the painted would be better as the much thinner paint will show damage

However: Basically: a fuel tank has to be above bilge water level, that is the real problem.
Chris
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Old 09-23-2018, 11:46 PM
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Originally Posted by fishmaster273 View Post
I wonder if you could Bedliner the tank to prevent corrosion.
Can you find a plastic tank that would fit?
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Old 09-24-2018, 02:55 AM
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All fuel tanks are installed so water can run under the tank without touching it. That said, when drains get dirty (and they do unless flushed regularly) tank bottoms do get wet.
You can have a long discussion about coating tanks and will never have other than the perfect theory.
An uncoated, well installed aluminum tank will last as long as ANY coated tank. The worst thing that can happen other than a tank compartment filled with water or wet foam is not having a 100% coated tank (anyplace humidity/water can get in.
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Old 09-24-2018, 04:38 PM
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All fuel tanks are installed so water can run under the tank without touching it.

Not true, mine weren't.
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Old 09-24-2018, 08:37 PM
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Can you wash out the drain holes by putting a garden hose down the inspection plates on deck?
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Old 09-24-2018, 08:38 PM
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Or is that dumb and creating more problems?
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Old 09-24-2018, 11:10 PM
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The tanks can be coated. Google it.

My grady recommends rinsing the tank of saltwater with a hose periodically but it’s in a coffin with drain holes. It’s coated with a gray coating by them.
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Old 09-25-2018, 03:34 AM
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Originally Posted by keysdiver View Post
All fuel tanks are installed so water can run under the tank without touching it.
Don't know about all manufacturers, but that is the way mine is.
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Old 09-25-2018, 06:36 AM
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It is safe to assume that all under deck tanks get splashed with bilge water.
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Old 09-25-2018, 06:57 AM
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Depends on design and materials of both tank and boat. Biddison 1800 fuel tank compartment is isolated from the bilge; a 2” pvc pipe glassed to inside of keel in fuel compartment transfers bilge water from bow to stern compartments. Shape of tank (vee with flat bottom) and neoprene pads elevate it up off hull where air flow from vents allows condensation to evaporate. Water and air sitting on or against aluminum eventually causes crevice corrosion. Aluminum tank in pictures has coal tar epoxy paint.

Last edited by LeakinLena; 09-25-2018 at 07:42 AM.
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Old 09-25-2018, 07:17 AM
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On a good boat they dont, and on a good boat there is an access hatch
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Old 09-25-2018, 08:37 AM
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Originally Posted by 30Concept View Post
Don't know about all manufacturers, but that is the way mine is.
That great until the hatch sealant leaks or water splashes over those back cut-outs and get trapped in there forever.. There is no perfect solution - I got 99 problems and worrying about the day my tank leaks aint one..
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