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post #31 of 48 Old 11-12-2010
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Originally Posted by deniseO30 View Post
oh no.. not yours too Eherlihy?
No, not yet, but not too far off.


I'm trying to prepare for the inevitable ...
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post #32 of 48 Old 11-13-2010
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eherlihy, you may have longer than you think. I don't see any evidence of moisture on the sections of the plywood that I see in your picture. On Karma moisture collected at the leading edge of the plywood mounting tray. You can visually inspect the area the by removing the battery boxes which will expose this area.

Denise, did you determine the cause and source of the leak that you had?

Karma's 30 gal. tank measures 22"w X 17"h on the frontside; 22"w X 12" on the backside and 23" from front to back.

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post #33 of 48 Old 11-13-2010 Thread Starter
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My old tank was weeping through tiny pin holes on the bottom mostly on the welded seam. The plywood support that was soaked with diesel so I guess it started going in the bilge when the plywood couldn't absorb anymore.

Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club.
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My boat is sold!
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post #34 of 48 Old 11-13-2010
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30 gal. tank measures 22"w X 17"h on the frontside; 22"w X 12" on the backside and 23" from front to back.
Thank you! That info is very helpful.

Yes, the mount doesn't look too bad (possibly because it is painted) but the tank has a lot of surface corrosion all over it. I am afraid to think about what is going on underneath..

My thought is that I could purchase two 12 gallon tanks (14"w X 11.75"h X 20"d) and transfer fuel between them for fuel polishing.

I would need to build a new platform, 28"w X 20"d, 5" high at one end, tapering to 0" at the other.

Alternatively, I could easily purchase a single 23 gallon tank (24"w X 20"d X 12"h) and fit it in there.

Yes, I would loose 6-7 gallons of capacity, but so what...

When / if I need to remove the current tank, I will cut it in half before I remove it.

Last edited by eherlihy; 11-13-2010 at 05:33 PM.
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post #35 of 48 Old 11-13-2010 Thread Starter
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I used the moller 19 gal tank. the platform was easy with plywood, alum angle iron and self drilling screws.

Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club.
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post #36 of 48 Old 11-13-2010
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eh-
Can you go 2-3 weeks without a tank? (i.e. hauled for season?)

Whatever you do, you have to start by pulling the tank. At that point...it might pay to clean it down (metal wool) and take it to a welding shop and see what they have to say. Heck, if it is infested with pinholes by all means toss it. But if the problem is a bad weld on a seam, they can just reweld the seam! Finsih up with a good cleaning, maybe use an epoxy or other tank liner product and a good coat of paint on the outside...and you've got your custom tank, better than new.
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post #37 of 48 Old 11-13-2010
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The surface corrosion is not something to worry about. Aluminum oxide is good as it prevents corrosion. What causes aluminum to fail is moisture and lack of oxygen, as in sitting in a continuously damp plywood mount.

There are several articles online concerning properly installing an aluminum fuel tank. Boats, Yacht: How to Install an Aluminum Fuel Tank

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post #38 of 48 Old 11-14-2010 Thread Starter
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Only thing I don't like about my 19 gal Moeller tank is the sloshing. but then the OEM tank did not have baffles either.

Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club.
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post #39 of 48 Old 11-14-2010
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Again, the tank is not leaking yet, but I am hoping to avoid a messy and expensive repair when I can least afford it.

HS - your post gives me an idea. Yes, I can go without the tank for a couple of months, as she has been hauled for winter. Unfortunately, the tank is currently FULL. (30 gallons of diesel at $3.50 a gallon is 100 bucks worth of fuel). The idea is to run the tank down over next season, and to simply paint the bottom and sides when I have the opportunity.

SC21 has a picture of his tank unmounted, but still trapped in the engine bay (before he unleashed the jigsaw).
I'll bet that I can access the bottom of the tank if I disconnect the fuel lines, remove the battery boxes, and move the exhaust out of the way.

If I do have to remove the tank, I will cut the aluminum tank and not the fiberglass.

Last edited by eherlihy; 11-14-2010 at 03:57 PM.
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post #40 of 48 Old 02-12-2011
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I am pulling my engine on my O'Day 30. I wonder if I should pull the fuel tank at the same time and inspect / replace as it seems to fill the entire cavity behind where the shaft goes through the hull. It appears to be more than a 20 gallon tank. I purchased the boat two years ago and the tank was full. I have yet to add any fuel to the tank and it still indicates half full. I have added the starbrite diesel treatment to it. Hmmm.... they say diesels will run on peanut oil :-)
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