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Old 18 July 2008, 16:39   #1
Country: UK - England
Town: Gloucestershire
Boat name: Osprey
Make: Osprey Vipermax
Length: 5m +
Engine: E-tec 300 G2
Join Date: Dec 2006
Posts: 4,008
Fuel hose diameter

I have got 9mm (3/8") fuel hose fitted on Time Bandit as this is what has to be fitted for any large E-tec. However I am concerned about the spigots on the fuel filter as they only have an internal diameter of 6 mm. These are the standard fittings that come with a Quicksilver type canister fuel filter and are meant for 3/8" hose.

Surely this defeates the object of having 3/8" fuel hose?

If you run an Etec lean then you will burn a hole in the piston so this is critical.

Any Thoughts?

Chris Stevens

Born fiddler
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Old 18 July 2008, 16:45   #2
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Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
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Posts: 12,552
If you're worried about it take a trip to a hydraulics supplier and try to get a fitting with a wider internal diameter. You might have to warm the hose a bit to fit it though.
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Old 18 July 2008, 17:21   #3
Country: USA
Town: Seattle
Boat name: Water Dog
Make: Polaris
Length: 4m +
Engine: Yamaha 60hp
Join Date: Apr 2007
Posts: 1,152
I would use them. Yes the fuel must flow faster through there. But if its meant to have 3/8" hose, then its by default meant to have 3/8" fittings shoved into that hose with their resulting minor restrictions. Its not like its designed for a continuous 3/8" lumen. If that were the case they would be specifying even larger hose to provide a fitting with a minimum 3/8" opening.

I would be more concerned about any restrictions in your filter. Either inadequate design flow or partial clogs.
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Old 21 July 2008, 02:51   #4
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
don't worry about it, the lenth of the hose will be the major restriction,
from my fluid mechanics days i remember the length of an orifice has as much effect on flow as the diameter, so a 1/4 spigot and inch or so long will only restrict as much as a foot of 3/8 orifice(being the hose)
You can get a lot of fuel through a 1/4 hole! more than most engines need, apart from maybe a pair of 3.6v8 2 stroke johnson 250s!!
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