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Old 20-10-2008, 09:25   #1
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Hissing Noise ?

Last night I was watching a movie on the boat when I started hearing a hissing sound. It was like air leaking out of a punctured tire. I thought oh S#$&T I have a leak. I started pulling up the bilge covers and the noise got louder. I pulled every bilge cover and they were all bone dry except the one by the prop shaft which always has a little water in it. I checked all the through hulls and valves nothing leaking. The hissing lasted about 5 minutes then stopped. I have only two aerosol cans on the boat and they were fine. Both fire extinguishers were fully charged. Propane tank was turned off. Checked all the bilges again this morning all bone dry. Any ideas?
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Old 20-10-2008, 09:32   #2
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Plugged vented loop from holding tank "unplugging" itself? Not 5 min though.

Water heater? Nope - no water.

Residual pressure in propane line? Not 5 min though.

How long after you shut the engine off were you watching the movie?

Was it a snake movie?

Hmmm.
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Old 20-10-2008, 10:02   #3
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Engine was off for three or four hours. Holding tank was pumpped out about that same time. lave wasn't used between the pump out and the time of the hissing. There was a snake in the movie but was about 30 minutes before I heard the hissing in the boat ;-)
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Old 20-10-2008, 10:32   #4
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Check your refrigerator. If you had not opened it in awhile and it is relatively cooler in you cabin than it has been in recent days/weeks, you may have the thermostat lower than needed for the conditions and one or more cans of soda/beer on the bottom may have begun to freeze and spontaneously popped their "pop-tops" allowing gas/fluid to leak out. It creates a short hissing noise and makes a heck of a mess on the bottom of the fridge--

Been there, done that, got the T-Shirt!

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Old 20-10-2008, 11:25   #5
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Engine was off for three or four hours. Holding tank was pumpped out about that same time. lave wasn't used between the pump out and the time of the hissing. There was a snake in the movie but was about 30 minutes before I heard the hissing in the boat ;-)

Gotcha!

5 min is a long time. Even 2 would be a long time.

Some sort of battery short? No explosion but maybe lots of bubbling. But you would have been able to follow the noise around.

Something outside?
Diver?
Dolphin? Nah....
Shore water hook-up with relief valve? Again, not 5 min.......
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Old 20-10-2008, 11:32   #6
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Maybe it's the cat?
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Old 29-04-2010, 02:26   #7
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I get the same thing on my boat. After much searching it turned out to be the sound from other boats propellers! And strangely, it much no difference (to how loud it is ) weather they are 10 Mts. away or 300 Mts.
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Old 29-04-2010, 04:09   #8
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Hissing noise??? . Any ideas?
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