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Old 23 October 2018, 08:35   #1
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water in the tank

can anyone suggest how to flush water out of a fixed fuel tank.
tank cant be removed. sealed into rib consol. ?
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Old 23 October 2018, 11:24   #2
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Hi, water has a higher density than fuel, so it should sit at the bottom. If it's a lot of water, I would disconnect the engine from the fuel line and drain the tank via the fuel line. There will still be some liquid left which is below the level of the sucking pipe.
Then, a reasonably installed tank should have a "man hole" or any other hole (sounder access etc.) somewhere on top. Open it and suck out the remaining liquid with a flexible tube.
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Old 23 October 2018, 12:00   #3
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The bigger question is how did it get in there?

Best way to drain it is via the outboard fuel hose if boat is on trailer, you can probably get a siphon going this way with a little extension piece.
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Old 23 October 2018, 13:13   #4
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water in tank

thanks for your replys guys.
two things.
the boat had been standing for a long time so no suprise the water was there (condensation etc)
the marine repair guys have cut off the tank and replaced it with 2 external plastic ones.
i felt the tank could of been flushed through to clear anything other than fuel in it.
well that what we used to do with cars.
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Old 23 October 2018, 15:20   #5
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You're getting great milage outta that poor tank. Fourth thread and it's not even there anymore!

inboard fuel tank

dirt in fuel tank

dirty fuel tank 2

I wonder will you catch poor ole Dubrus next time?
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Old 23 October 2018, 15:27   #6
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dirty tank 3

oh the tank is still there my friend. thats the point.
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Old 23 October 2018, 16:25   #7
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Quote:
Originally Posted by willk View Post
You're getting great milage outta that poor tank. Fourth thread and it's not even there anymore!

inboard fuel tank

dirt in fuel tank

dirty fuel tank 2

I wonder will you catch poor ole Dubrus next time?
Never spotted that....no is the answer.
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Old 24 October 2018, 14:31   #8
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So what are you trying to do? Drain the tank of water so you can recommission it? Or flush out the fuel so itís not a stinking flammable mess and then get the water back out? Or just get the dregs out the bottom?
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Old 24 October 2018, 18:30   #9
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a few years ago we were fed up with crap clogging the fine jets on our yam 115 and so set about cleaning the tank out.

We cut a 120 mm hole in the top on the underseat Ali tank, syphoned out all we could and the with buckets of hot soapy flushed the tank out.

Then with syphone and sponge got rid of the liquid.

Replaced the hole with an alu disc screwed and sealed into place. Never had a problem since.

David j
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Old 25 October 2018, 16:37   #10
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water in tank

i would love to use the original tank. holds more than the plastic ones, means more deck space.
just couldnt see why the tank had to be de- commisioned. the yard just took the easy way out i felt.
hindsight etc
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