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Old 09 May 2015, 11:53   #1
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Expansion fuel tanks

I want to get an expansion tank for our Yamaha 6 outboard attached to our Brig Diablo 3m inflatable. My question is how long would a 25L tank of fuel last just poorling around? We're planning to go to a waterpark in Holland next month.
Thanks in adavance for any advice.
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Old 09 May 2015, 12:46   #2
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Originally Posted by Ridgewoodwoody View Post
I want to get an expansion tank for our Yamaha 6 outboard attached to our Brig Diablo 3m inflatable. My question is how long would a 25L tank of fuel last just poorling around? We're planning to go to a waterpark in Holland next month.
Thanks in adavance for any advice.
I had a 5hp yam which would do 20 miles on its internal tank running at WOT about 4hours running time Pushing a 5m fast fishers at 5kn if you want exact h/25lt just run engine on 0.25ltr and time

Hope that helps
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Old 09 May 2015, 13:14   #3
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Rule of thumb is WOT = 10% of HP in gallons per hour, obviously less at lower speeds but I'd work close to this as a general all round to be safe so maybe 10 hours for your 25 litres.
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Old 13 May 2015, 09:57   #4
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Thans for the answers. Now, where to get one and which make. Our local chandlers don't stock so I'll have to go online. Any suggestions gratefully received.
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Old 13 May 2015, 10:07   #5
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Thans for the answers. Now, where to get one and which make. Our local chandlers don't stock so I'll have to go online. Any suggestions gratefully received.
barnet marine,international marine supplies,force four chandlers.
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Old 14 May 2015, 03:31   #6
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Thanks for that. Sorry to keep banging on but apparantly according to Yamaha their expnsion tank only comes with a very long fuel hose. As the tank would sit directly underneath the outboard this would be far too long. Any suggestions?
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Old 14 May 2015, 04:01   #7
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Thanks for that. Sorry to keep banging on but apparantly according to Yamaha their expnsion tank only comes with a very long fuel hose. As the tank would sit directly underneath the outboard this would be far too long. Any suggestions?
i just cut the hose back to suit or just tie wrap the excess in a coil that way your not going to cause any probs.
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Old 14 May 2015, 04:08   #8
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OK. I hoped that was the case but didn't know if there were special connectors either end that might be difficult to re-attach.

Grateful thanks.
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Old 14 May 2015, 04:17   #9
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OK. I hoped that was the case but didn't know if there were special connectors either end that might be difficult to re-attach.

Grateful thanks.
just go on e-bay and get s/s fuel cripms or jubaliee clips, to be honest i have used zinc ones before from an auto shop
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Old 14 May 2015, 04:23   #10
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Nothing wrong and an easy job cutting fuel hose and re-making joints.... but I'd go for making a neat coil of the spare rather than shortening. You never know when you might want to put the tank nearer the bow for balance, use it in another boat, sell it on etc etc.
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