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Old 18 January 2017, 16:13   #11
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Quote:
Originally Posted by Fenlander View Post
>>>Avoid the silver Mercury Marine stuff. It breaks down internally after 12 months and jams the line solid.

Very sweeping statement eh? If true there wouldn't be a Mercury/Mariner left running over 12mths old??

That silver Mercury hose is my favourite for SIB/outboard use having the perfect blend of strength and flexibility. I've had several Mercury/Mariner outboards with the original silver hoses over 10yrs old... no problems ever.

Do agree about some cheap hoses from motor factors being unsuited to outboards. It can go so inflexible in a couple of years it's useless.

Is that Gates GFH1031x hose nice and flexible... will it "flop" where you put it or try and retain the shape of the coil it came in.
I was a Yamaha head engineer for 20 years until last year. In the last year I was in the trade I had numerous breakdowns caused by mercury silver fuel pipe which I myself had fitted to boats 2-3 years previously. The silver pipe has a clear inner lining - the clear lining breaks down, becomes unbonded from the silver outer and clogs the fuel line.

It was so bad any boat that I had fitted it too which hadn't yet broken down, I took it on myself to remove and fit genuine Yamaha black rubber hose. And I dumped coils of brand new merc stuff.

The old stuff is much better, it was the best as would last for years.. The newer stuff may possibly be made for mercury by sierra?

So yes it is a sweeping statement
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Old 18 January 2017, 16:20   #12
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And a quick search on the internet reveals I'm not the only one to have had this issue:

https://theboatgalley.com/outboard-fuel-line-problems/

And:

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Old 18 January 2017, 16:54   #13
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the gates fuel hose will flop and lie wherever you want it, though this doesnt mean that kinks easily. it really is user friendly, and thats why i use it!
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Old 19 January 2017, 02:57   #14
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Thanks for explaining phantom. I'll make sure I check the Mercury line I have in use at the moment on my 2016 Suzuki DF20. I "upgraded" to a Mercury line as the supplied Suzuki one was far too soft and would kink easily, also the Suzuki bulb failed in the first few hours of use, as did the Suzuki tank end connector!

So having never had an issue with the Mercury lines before it seemed a reasonable choice as replacement.

Thanks for that confirmation Festinghouse, I may get some of that Gates hose.

In any case I always carry a complete unused fuel line with bulb and connectors as one of my emergency spares.
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Old 19 January 2017, 07:45   #15
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This article also covers it quite well
What Ethanol does to your engine... fuel lines & system!
Mercurys take on Ethanol blended fuel

and for those of us with grey mercury fuel lines - this advice from the USofA (albeit from a Mercury tech)

Replace main fuel line from tank to engine with EPA Approved fuel line and primer bulb. I'd recommend only the OEM Mercury/Quicksilver fuel line & bulb here... and make sure it's the gray line with BLUE PRINT (not red print).

My old ones had orange lettering but the same applies. To be fair, when I removed the old (7 years) lines, there was no visible deterioration of the liner - but we don't yet have an issue here with higher ethanol content.
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Old 19 January 2017, 11:32   #16
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Quote:
Originally Posted by phantom 19 View Post
I was a Yamaha head engineer for 20 years until last year. In the last year I was in the trade I had numerous breakdowns caused by mercury silver fuel pipe which I myself had fitted to boats 2-3 years previously. The silver pipe has a clear inner lining - the clear lining breaks down, becomes unbonded from the silver outer and clogs the fuel line.
Is that the plastic-lined rubber hose? My buddy had the same problem; plugged hoses and perforated LP fuel pump from the plastic pieces.

jky
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Old 20 January 2017, 17:11   #17
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These days 5% ethanol is minimum over here, and that is the stuff i use. Haven't so far had issues with carburetors, but fuel lines dies very quickly, especially cheap nylon type for outboards even if they are said to take ethanol. Have tried various brands, cheap and expensive, but so far don't have much thrust they all seam to deteriorate rather quickly. Strange that they lasts in cars but not in marine environment? Or maybe the ones in cars are just better quality.
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Old 21 January 2017, 12:09   #18
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The only type I have found which is any good is the genuine Yamaha line, black rubber without any lining to delaminate. Dealers can order it on the reel and in two internal diameters, but it is pricey.
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Old 21 January 2017, 15:47   #19
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If that Yamaha line really is "the" stuff to have only going to cost £20 for a SIB owner to replace keeping existing connectors and primer.

Yamaha 90890-56878 6mm Fuel Hose
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