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Old 28 April 2010, 16:20   #1
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Country: UK - England
Boat name: abymac three
Make: avon 560 adventure
Length: 5m +
Engine: 115 df
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petrol feed

Hi all, can anyone tell me, what size internal pipe size should be to fuel a 115 hp 4 stroke, as the connectors look awfully small on the fuel filter the tube itselfe looks ok but fitting inside pipe is a lot smaller, thanks for reading this. regards...
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Old 28 April 2010, 16:42   #2
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Country: UK - Wales
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Is the fuel filter under the hood of the motor or an aftermarket unit fitted elsewhere on the boat?
Any pics?
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Old 30 April 2010, 04:08   #3
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fuel feed

Hi, its an after market filter the filter at top and the sight bowl underneath. fixed to transome. cheers ...
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Old 30 April 2010, 04:41   #4
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I'd guess 3/8" at a minimum.

For what it's worth I had 1/4" on my old Searider / 25hp - I used the same tanks & hoses on nthe Humber with a 55 - It wouldn't handle WOT for more than about a minute before starvation.

The simple test is open up the throttle & see if it coughs after a minute or two!
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Old 30 April 2010, 04:44   #5
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My 90 4-stroke had 8mm fuel hose, but obviously the connections are smaller where they slide into the tubing.
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Old 30 April 2010, 06:54   #6
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The motor's likely to have 5/16" or 3/8" ID fuel hose, so you may need to change the fittings on the filter housing (cheap enough) to suit the hose. The hose should be a tight fit on the barb fitting.
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Old 04 May 2010, 03:12   #7
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Country: UK - England
Boat name: abymac three
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Engine: 115 df
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fuel feed

Thanks lads much apriciated,ill blast it and see . if ness i will change the fittings thanks again ... regards...
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