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Post by smith69085 on Aug 20, 2020 11:13:00 GMT
I have a 2007/08 Jeanneau 42ds, which we purchased 6 about months ago. I noticed today the water separator fitted near the tank under the stern bunk appears to be plumbed back to front! photos.app.goo.gl/e2WGAt9ajSEihSAAAThe pipe from the tank (on the right side of the picture) goes in the Out port (shown by the arrow) and the in port goes to the fuel pump. Has anyone else seen this, or am I miss-understanding something? |
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Post by Don Reaves on Aug 20, 2020 11:15:10 GMT
I can't see your picture. Do you need to mark it public?
Don
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Post by smith69085 on Aug 20, 2020 11:24:53 GMT
It should be public, how about this album link?
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Post by smith69085 on Aug 20, 2020 11:25:04 GMT
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Post by smith69085 on Aug 20, 2020 11:35:54 GMT
I can't see your picture. Do you need to mark it public?
Don
Compressed version of the pic attached  |
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Post by Don Reaves on Aug 20, 2020 11:54:03 GMT
Yes, that one worked.
Thanks.
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Post by smith69085 on Aug 21, 2020 6:48:08 GMT
So having spoken with a yacht surveyor I know about this and looking at the separator diagram in the manual, it seems this should make little difference to the separator function.
It should still collect water in the bottom of the bowl.
His recommendation, in line with many others on the forums is to replace with a glass bowl type unit do you can visually check the bowl level.
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Post by MickeyB on Aug 21, 2020 6:59:29 GMT
This actually intrigues me. There MUST be a reason for having a flow direction, or the manufacturers wouldn't bother with the expense of printing arrows etc onto the hardware.
I thought water separators, albeit very simple devices, relied on the direction of flow to cause a 'calm' point where the fuel doesn't keep churning up the already separated water. Reversing this, although may be okay, doesn't sit right with my logic.
Can you post a picture of the inner workings please, I think you mentioned you found one?
Thanks,
Mike
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Post by Charlie-Bravo on Aug 21, 2020 8:12:55 GMT
Your surveyor is both correct but at the same time wrong. fuel from the tank flows into the water separator bowl, when the bowl is full the fuel containing water molecules passes up through a filter which does let fuel through but not the water, due to molecule size, and off the cleaner fuel goes to a secondary filter or two on its way to the injection pump. over time the water molecules build up on the filter in the separator and turn into 'globs' once a reasonable size of water glob is built it falls off the filter to the bottom of the bowl as it is heavier than the fuel.
So, your surveyor is correct that plumbed backwards it will stop water, but wrong in saying it will work either way as the globs will remain on the tank side of the filter and not reach the nice glass bowl to be viewed, and just store themselves in the fuel pipe.
Given plenty of time this is likely to provide lots of quality entertainment for you, the engine will probably start and then behave badly, as the fuel is having a jolly difficult time reaching the injection pump, and when you need it the most, stop, and refuse to start, you will then rush to the glass bowl , spot not one glob of water, and presume the problem is elsewhere, and spend a long time looking where the problem isn't at the same time as worrying about how you are going to ... avoid that rock, or moor up in the rather tight marina berth, .... it will be tight and difficult, .... it's Sod's law.
Do yourself a favour, swap them over at least, and adding a clear bowl with a drain is also nice to have.
CB
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