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Old 04-22-2012
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This mystery has me beat.

Boat is on the hard.
Removed cover to do work.
Noticed diesel on the ground directly under cockpit drain.
Noticed that diesel had/was dripping from cockpit drain.
Diesel fill is in floor of cockpit.
Dipped tank with that stuff that turns red if water is present. None found.
I thought that the drains had become clogged causing water to flood cockpit, seep into tank and push fuel out.
Noticed vent tube had diesel residue on it.
Fuel is definitely coming from vent.
I had shut off the fuel valve on the bottom of tank months ago.
I'm 90% sure I topped off tank to the brim and added stabilizer and biocide before putting boat to bed.
What could cause this?
Heat?
We had some unseasonably hot weather 90+ degrees.
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Last edited by jppp; 04-22-2012 at 04:37 PM.
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Old 04-22-2012
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Re: This mystery has me beat.

I'd figure that if you really did fill the tank to the brim, the fuel's expansion from the heat caused a bit of an overflow.
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Old 04-22-2012
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Re: This mystery has me beat.

I can't for the life of me think of any other cause.
jp
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Old 04-22-2012
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Re: This mystery has me beat.

Pray to the tank gods that the tank doesn't have pin holes in the bottom? The gods were not so kind to my tank about 3 yrs ago.
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Old 04-22-2012
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Re: This mystery has me beat.

I've always been advised to not fill diesel tanks to the brim. i'm thinking Creedence is on the money.

Hey Denise .... your pin holes ? What tank material ?
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Old 04-22-2012
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Re: This mystery has me beat.

I was thinking full would reduce chance for condensation. There is never a free lunch.
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Old 04-22-2012
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Re: This mystery has me beat.

It does, just not to the very brim of the tank. It's typically a good practice to leave a little space for expansion (which isn't super-uncommon).
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Old 04-22-2012
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We have had this issue on the boats I used to work on. We learned to always leave expansion room. Fuel is pretty cool temperature wise when you get it from the dock storage tanks. Add heat from the sun, heat from a running engine and the fuel would always expand. It takes some trial and error to find your topping off mark,.....
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Old 04-22-2012
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Re: This mystery has me beat.

Wile you said that you filled the tank before putting her to bed, you didn't mention if the tank was observed full when you dipped the tank... If the fuel level is still at the top, then probably expansion (either that or the birds in your area are poopin' diesel ). If the fuel level is lower than it was at bedtime, then you have probably discovered a leak.
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Old 04-22-2012
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Re: This mystery has me beat.

Quote:
Originally Posted by tdw View Post
Hey Denise .... your pin holes ? What tank material ?
TDW, the original tank on my boat was aluminum. there was a slight presence of fuel in the bilge under the prop shaft, later on (about a year after having the boat) it was showing up in the bilge over the keel. the plywood supports were soaked. 1982- 2009 not a bad life time for a tank imho. Have a moeller polyeth tank in there now. just wish it had baffles.
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