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Old 15 April 2015, 07:44   #11
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Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Suzuki DF20 EFI
Join Date: Nov 2007
Posts: 3,279
And the other thing... do I just replace the pipe and assume all will be fine or do the full carb overhaul while it's off... or at the very least just replace the pump diaphragm??

I can see from the screw heads the fuel pump has been off before so may have a relatively recent diaphragm prior to my purchase.

I did just pop the jet out of the bottom of the float bowl that drains it and there wasn't a hint of debris in the jet or fuel that came out.

Would be nice to think it was all done with new gaskets but sometimes once you touch a carb on an outboard... superstition and all that!
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Old 20 April 2015, 06:14   #12
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Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Suzuki DF20 EFI
Join Date: Nov 2007
Posts: 3,279
Just an update on the solution...

When I took off all the "balancing" pipes (that's what the local Mercury dealer called them, for crankcase pressure balancing he said) I found the bottom one was split too near the crankcase end.

Mercury dealer couldn't help with the pipe but I went to the garden machinery place in town and their very on the ball parts guy soon found exactly the od/id I needed, 1.50 for 50cm. It was fuel pipe for an Oregon chainsaw. Image attached.

Cheap repair for that part of the job then.

He commented they are supplying loads of fuel hose as the modern unleaded affects rubber hose on older machinery.

Probably worth any owner of similar model Mercury/Mariner outboards replacing this hose during a yearly service rather than waiting for it to split.

Decided to do the carb clean and overhaul while it was off.. will do a separate thread for that.
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