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Old 04-08-2019, 16:28   #1
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Fuel hoses for yanmar 3gm30f

I recently suspected an air leak from my yanmar fuel lines, and since the boat/fuel lines are 19 years old I figure to go ahead and put new ones in. I'm also replacing the racor filter assembly as it leaks at the priming pump when priming. At the local auto parts store I asked for diesel fuel lines and explained they are used on a boat. When I pulled the old lines off I noticed they have a yellow inner liner, which looks plastic. The replacement lines don't.

Question: Is there a specific marine diesel fuel hose I should be using?
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Old 04-08-2019, 16:31   #2
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Re: Fuel hoses for yanmar 3gm30f

No. Use any hose rates for diesel fuel. Gas line is probably OK especially if ethanol rated.
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Old 04-08-2019, 16:35   #3
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Re: Fuel hoses for yanmar 3gm30f

Yes, you should use A1 fuel hose that meets I believe USCG standards, automotive fuel hose doesnít.
Iím pretty sure but not certain about USCG standards. I canít quote chapter and verse
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Old 04-08-2019, 16:40   #4
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Re: Fuel hoses for yanmar 3gm30f

What Nicholson58 and a64pilot said +1.

Original Yanmar fuel lines do not have any yellow (plastic?) inner liner - at least none of the Yanmars I have ever seen have them.

This is just a 5/16" (8mm) diesel fuel line same as used for zillions of vehicles etc.
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Old 04-08-2019, 17:10   #5
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Re: Fuel hoses for yanmar 3gm30f

Are these new diesel fuels any different? I would be tempted to use a gas fuel hose with the inner liner for modern gas. Almost all high performance aircraft hoses are Teflon lined and that is what I think they are using in the hose I see at the boat store.
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Old 04-08-2019, 18:19   #6
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Re: Fuel hoses for yanmar 3gm30f

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Originally Posted by Ecos View Post
Are these new diesel fuels any different? I would be tempted to use a gas fuel hose with the inner liner for modern gas. Almost all high performance aircraft hoses are Teflon lined and that is what I think they are using in the hose I see at the boat store.
I wouldn't sweat it too much for diesel boat engine. Replaced our fuel hoses about 4 years ago, AFAIK they were the original yanmar ones that did 35 years with no teflon lining. They were looking pretty sad tho
A mate gave me some 300psi WP flame resistant USMSHA 26-11c 1/4" fuel hose thats made in Mexico & has no lining.Pretty sure you can get the same stuff in an auto store in the USA or equivalent
It is holding up fine & I'm using it for oil lines to a remote oil filter as well so if it can cope with hot oil (but only about 60C) it should cope with diesel.
Our yanmar workshop manual says replace hoses every 4 years FYI
Sounds like overkill to me
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Old 04-08-2019, 18:20   #7
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Fuel hoses for yanmar 3gm30f

The A1 marine fuel hose meets burn tests and I believe the A part of it is permeability, meaning itís not permeable, there is also a B hose that isnít meant to have fuel in it continuously.

Why it matters is one day you may have to get a survey and you may get a surveyor that knows better, plus standards exist for a reason, and itís usually safety.

Not saying buy the hose here, but it does quote chapter and verse
https://www.wholesalemarine.com/fuel-hose-uscg-type-a/
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Old 04-08-2019, 18:31   #8
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Re: Fuel hoses for yanmar 3gm30f

This spells it out better
https://www.law.cornell.edu/cfr/text/33/183.540
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Old 04-08-2019, 18:57   #9
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Re: Fuel hoses for yanmar 3gm30f

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Originally Posted by a64pilot View Post
The A1 marine fuel hose meets burn tests and I believe the A part of it is permeability, meaning itís not permeable, there is also a B hose that isnít meant to have fuel in it continuously.

Why it matters is one day you may have to get a survey and you may get a surveyor that knows better, plus standards exist for a reason, and itís usually safety.

Not saying buy the hose here, but it does quote chapter and verse
https://www.wholesalemarine.com/fuel-hose-uscg-type-a/
Not arguing with you but
USMSHA 26-11c is a mining standard for the fuel hose we are using & I've worked in mining & they are just as worried, if not more, about explosions as boaties. Doubt very much if USCG standards are any more stringent but I'm not going to pay to access the papers to prove it, or not as the case maybe.
I certainly have no hesitation about using fuel hose thats up to mining standards. YMMV
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Old 04-08-2019, 18:59   #10
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Re: Fuel hoses for yanmar 3gm30f

I was tempted to use aircraft fuel hose, cause I could get it for free. I can assure you it way more than meets the USCG standard, but isnít marked for it, so itís not legal.
I did use quite a lot of aircraft wiring on my bank, the jumpers etc.
I donít write the rules
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Old 04-08-2019, 19:11   #11
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Re: Fuel hoses for yanmar 3gm30f

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Originally Posted by a64pilot View Post
I was tempted to use aircraft fuel hose, cause I could get it for free. I can assure you it way more than meets the USCG standard, but isnít marked for it, so itís not legal.
I did use quite a lot of aircraft wiring on my bank, the jumpers etc.
I donít write the rules
Yes can see your point if you have to get the fuel hose designation past a surveyor to get insurance. I was only looking at it from the point of doing the job.
We don't seem to have to do that here but no doubt it's coming sadly.

Thanks for pricking my brain about aircraft fuel line, I know a turbine tech for a source if I need any more
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Old 05-08-2019, 00:01   #12
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Re: Fuel hoses for yanmar 3gm30f

I am not sure any surveyor here in Australia is going to worry about using automotive fuel lines in a boat. My own yacht fuel lines are from the auto shop.
I did ask a guy to replace the flexible PVC pipe he was using for an exhaust hose last week. He had wrapped most of it with exhuast lagging which sort of made me wonder why he did not just buy exhaust hose to start with?

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Old 05-08-2019, 09:22   #13
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Re: Fuel hoses for yanmar 3gm30f

Rather than your local auto parts store, go to a local heavy equipment or Tractor trailer supply store.
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Old 05-08-2019, 09:31   #14
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Fuel hoses for yanmar 3gm30f

Go to a Chandelier. Look at the A1 fuel hose, youíll understand then.
Often times getting something that has met this or that standard just means it was submitted for testing is all. Itís the same product.
However youíll immediately see that the A1 fuel hose is much more robust and tougher than even automotive fuel injection hose.
If you must use automotive stuff, try to find fuel injection hose, it costs more, but is meant for much higher pressure use, and it stronger than regular fuel line.
That is what I used in my dinghy as the fuel tank is about 10í away from the engine.
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Old 05-08-2019, 09:39   #15
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Re: Fuel hoses for yanmar 3gm30f

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Originally Posted by a64pilot View Post
I was tempted to use aircraft fuel hose, cause I could get it for free. I can assure you it way more than meets the USCG standard, but isnít marked for it, so itís not legal.
I did use quite a lot of aircraft wiring on my bank, the jumpers etc.
I donít write the rules


So if you had put fire sleeve over the bogus fuel hose, would the surveyor know what was under it?
I would not want an inspector who didn't know what quality hose looks like. They make all kinds of value judgments, make another one.
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