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Old 09 October 2015, 14:10   #31
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Country: UK - Wales
Town: Swansea
Make: HydroForce Nav Rapid
Length: under 3m
Engine: Johnson 4hp MY2000
Join Date: Sep 2015
Posts: 51
This is now getting more than a tad frustrating. Run it with shut off valve off for over 30 mins, even in gear with a little throttle. Looking at how the fuel lines are connected I cannot see how the shut off valve could affect the flow, in the exploded diagram attached the integral fuel tank is connected to 33, there is a hose connecting the crankcase to 9. The hose connector adjacent to 9 has no hose. The fuel pump has a hose leading from the external tank connector and also a connector with no hose.

This arrangement makes no sense to me, I’m beginning to think that the previous owner had done some work on it and got a bit lost when putting it back together. Unfortunately I’ve not been unable to find a definitive schematic of the correct fuel line arrangements. Hopefully someone here will know what it should look like.
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Old 09 October 2015, 14:54   #32
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Country: UK - England
Town: Leicester
Length: 5m +
Engine: 135hp Mercury
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Posts: 707
If there is a fuel shut off valve between the carb & the fuel supply & it's fully closed but the engine continues to run as yours is then it's either defective or there's another operational fuel line that you haven't found.
Trace the fuel lines from the carb to their other ends.

It is a shut off valve not a changeover valve from internal to external tank?
My Suzuki 4hp has this type of valve. When it's in the external position without an external tank connected it quickly dies. I use it to shut the fuel off when it's tilted up or not in use.
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Old 09 October 2015, 15:40   #33
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Country: UK - Wales
Town: Swansea
Make: HydroForce Nav Rapid
Length: under 3m
Engine: Johnson 4hp MY2000
Join Date: Sep 2015
Posts: 51
Just found a video on Youtube which clearly shows that the integral tank hose should be connected to the connector adjacent to 9 in the diagram (no hose at present) and a hose from the unused connector on the pump to 33 in the diagram (where the integral tank is connected know). So my suspicions seem to be correct, the previous owner has lost his way when putting things back together.

Thanks all for your help and suggestions.
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Old 09 October 2015, 15:49   #34
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Country: Finland
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Boat name: SR 5.4
Make: Avon
Length: 4m +
Engine: Toh1 3,5 Yam 90/2S
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Posts: 896
I believe in running it dry as dubrus recomends. This in connection to use the spare connector (on the engine) while running the engine out of fuel and spraying fogging oil into the carbs. Just stripped the carbs on my Yam 90 aeto. There was absolutely no varnish in any part of the carbs. There was som crap in the bowl of lowest carburator, but as always used a 10 micron main filter, think that has been there before "my time".
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