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Leaking Fuel Tank |
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StavrosNZ 
Rear Admiral 
Joined: 24 October 2014 Location: New Zealand Status: Offline Points: 581 |
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 Posted: 18 November 2018 at 19:51 |
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Hi Blackswan, i also have 400, 2010 vintage, i discovered a diesel leak and traced mine back to the screw on inspection port cap on the tank itself. I have black plastic tank with approx 160mm dia screw down inspection port. The port seals on an o-ring that wasn't seating properly due to some slight distortion in the shape of the tank. I replaced o-ring with slightly over sized o-ring and applied small amount of vaseline on o-ring before refitting, no more leaks.
Also check you fuel tank sending unit gasket as well, neither of these will leak will berthed flat but will leak when sailing and healed.
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Stephen
2010 H400 #691, Auckland, New Zealand |
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pdc78
Commander 
Joined: 27 May 2016 Location: UK Status: Offline Points: 142 |
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Posted: 11 December 2018 at 09:37 |
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I decided to replace the fuel tank sender on my 2016 H345 with a Wema style magnetic reed switch one, and followed earlier helpful posts to be confident of the change. I also measured the tank outside which seemed to confirm that a 250mm sender would be the right size. However - be warned- when I came to do the swap I found that the tank appears to have a indent on the underside (perhaps it is designed to go on port or starboard side? - mine is starboard) and the 250mm sender was too long to go vertically. I have now ordered a 200mm unit and will be selling the long one on the auction site in the new year.
Lesson: plumb the depth before ordering! Good luck. H345 Aeolus |
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Fendant
Admiral 
Joined: 03 November 2012 Location: Switzerland Status: Offline Points: 1671 |
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Posted: 13 December 2018 at 18:01 |
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I have a leak somewhere in the filler piping. If you overfill some Diesel lands in the bilge and stinks. My solution is to only fill the tank to 90%, since then it never occurred again.
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Frank
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blackswan
Lieutenant 
Joined: 25 January 2016 Location: Australia Status: Offline Points: 29 |
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Posted: 28 January 2019 at 09:42 |
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Thanks will check those again, the present crisis is that a through hull snapped off in my hand. we are changing all of them tomorrow!!
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perry
Captain 
Joined: 13 October 2015 Location: IOW Status: Offline Points: 318 |
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Posted: 16 November 2022 at 09:15 |
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A couple of points dont know how relevant in your country: Here in Europe road diesel comes with 5 or 10% bio diesel added to make it "green Diesel" this has caused some probems with degradation of some rubber fuel components and worse can with water in diesel create a great environment to grow diesel bugs which clog fuel filters. . However we use only "red" diesel for boats and my own souce gaurentee no Bio added. Secondly my comments on plastic tanks for fresh water may also be applicable to your plastic tanks. I cant seem to link my post so paste it below:-
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Current Yacht Hanse 315 2007
Last Yacht Hanse 301 Round GB in 2017 |
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kipwrite
Commadore 
Joined: 14 October 2015 Location: New York Status: Offline Points: 495 |
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Posted: 08 November 2025 at 15:25 |
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Reviving an old thread:
My starboard tank has now developed a leak when completely full. Like others, I've placed absorbent cloth near all the openings at the top of the tank, and no leaks have been revealed. Fuel lines appear intact, no leaks seen. The spilled fuel winds up in the fiberglass sump that surrounds the tank and is contained and allows for a thin pump pick up so I can remove it. Aside from a potential crack in the top or side of the tank I haven't yet spotted, any ideas where else to look? White plastic tanks, US model boat (505/2016) Must remove the center island to have a closer look at things, but thought I'd check here first. In the meantime, I keep to about 80% full.
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Kipwrite
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Ratbasher
Vice Admiral 
Joined: 31 May 2017 Location: Cyprus Status: Offline Points: 818 |
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Posted: 08 November 2025 at 16:24 |
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The fact that it only occurs when full suggests that increased pressure could be an issue; diesel expands with increasing temperatures, perhaps by as much as 10% if there was enough variance after filling at lower temps. In addition to obvious leak-points in fittings and gaskets, as you've a poly tank this might well flex so I'd also check all likely areas of stress. You can get UV-reactive fuel dye which should show exactly where the leak is coming from; I think Amazon stocks that and the flashlight. Of course, fuel is just like water; it can come out a long way from where it originates from. Good luck!
Edited by Ratbasher - 08 November 2025 at 16:48 |
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H400 (2008) 'Wight Leopard' Gosport, UK
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perry wrote: