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Diesel fuel line from CAV to engine sweating

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SamsonII View Drop Down
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    Posted: 03 July 2019 at 07:27
Hi,

I have noticed that the fuel line from the CAV filter mounted on the diesel tank to the engine is sweating - there is a thin coat of diesel on the first 20-30 cm of the hose. I have dried it of, several times, but it comes back after some time. Have others had the same experience? The fuel line is the original that came with the boat when it was new in 2006. 

There are no cracks or other visual faults on the line. But should they be changed at a certain interval? Will they a some point start to weep just out of age?
Stein-Erik Carlsen

Hanse 370e 2006 #41 "Samson II"
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Captain Cook View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Captain Cook Quote  Post ReplyReply Direct Link To This Post Posted: 03 July 2019 at 10:59
Yes, your fuel hoses should be changed after some years, I do not remember the exact interval, but I believe that your hoses are well fit for a renewal after 13 years.
I renewed the hoses after 8-9 years
Update: Just checked Yanmar Service Manual 3JH4E: Rubber fuel hoses: Change for every 500 hours of operation.
The hose from watere separator filter to engine is moving when the engine is moving, and should be the first to show signs of stress.
When I changed the fuel hose I found these interesting items inside the old hose:


Edited by Captain Cook - 01 March 2021 at 16:29
Freya H400 #27 (2006), 40HP 3JH4E, 2-cabin, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M603(VHF)+M802(SSB)
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SamsonII View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SamsonII Quote  Post ReplyReply Direct Link To This Post Posted: 04 July 2019 at 05:58
I will definately replace all the lines before the holiday. What is the dimension used on the 3JH4E? My guess is 8mm. Hope to avoid disconnecting the present lines before I start the job. Guess diesel spill is difficult to avoyd...
Stein-Erik Carlsen

Hanse 370e 2006 #41 "Samson II"
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SamsonII View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SamsonII Quote  Post ReplyReply Direct Link To This Post Posted: 04 July 2019 at 07:39
I found the answer myself in the installation manual (was available online):


Stein-Erik Carlsen

Hanse 370e 2006 #41 "Samson II"
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Lippe View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lippe Quote  Post ReplyReply Direct Link To This Post Posted: 01 March 2021 at 14:15
Originally posted by Captain Cook Captain Cook wrote:

Yes, your fuel hoses should be changed after some years, I do not remember the exact interval, but I believe that your hoses are well fit for a renewal after 13 years.
I renewed the hoses after 8-9 years
Update: Just checked Yanmar Service Manual 3JH4E: Rubber fuel hoses: Change for every 500 hours of operation.
The hose from filter to engine is moving when the engine is moving, and should be the first to show signs of stress.
When I changed the fuel hose I found these interesting items inside the old hose

Fuel hoses on my 2008 3JH4-E are not flexible anymore and I will change them. Concerning de-aeration of the system is there any preferred way to do it. Whether I just disconnect them all and pump then oil to system using a manual pump installed in fuel line (similar than in outboards) or is it better to change hoses one by one? 
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alettaenmarcel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote alettaenmarcel Quote  Post ReplyReply Direct Link To This Post Posted: 01 March 2021 at 17:39
our 370 is also from 2006. So far no problem with the original hoses but I will check this weekend.
Kids Dingys 72-79 ,Several Windsurfboards 79-86 OK dingy competitions 86-92 , Trotter Pandora Race 92-98, Friendship 28 Sport 98-05, Hanse 370 06-......
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lippe Quote  Post ReplyReply Direct Link To This Post Posted: 01 March 2021 at 17:52
Originally posted by alettaenmarcel alettaenmarcel wrote:

our 370 is also from 2006. So far no problem with the original hoses but I will check this weekend.

My hoses look good but many of them are hard like stone (ready to crack?). Last week my hoses from engine top to boiler were changed same time with coolant change. Those hoses were also in really inflexible shape. I added also shut valves to both new hoses.


Edited by Lippe - 01 March 2021 at 17:57
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark_J1 Quote  Post ReplyReply Direct Link To This Post Posted: 02 March 2021 at 09:45
Good spot all. As we are on a 400 hull #31 it seems a good preventative measure.  Also worth mentioning to check the heating duct which typically runs below the CAV filter.  It can develop cracks from pressure when removing the filter.  Then if you get a drip from the filter it drops straight into your heating duct :-)  Especially if you get a small of diesel when running the Webasto.  They heating ducts are not robust.
Hanse 400e "Grey Goose" Hull #31
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