Captain Sensible Posted February 1, 2023 Share Posted February 1, 2023 The 22L kind, air valve lets air in for fuel to go out. How much vapour goes the opposite way? Moving tank from stern to under cuddy on an Orkney stinkliner no wanna go bang 🔥 ⛴️ Quote Link to comment Share on other sites More sharing options...
Saintly Fish Posted February 1, 2023 Share Posted February 1, 2023 I'm not an expert but I'd think that a good conditioned air inlet valve will have a one way non return valve in it. So theoretically it won't cause an issue if regularly checked for soundness. Quote Link to comment Share on other sites More sharing options...
Captain Sensible Posted February 1, 2023 Author Share Posted February 1, 2023 One time when I sat accidentally on the fuel tank air came out the vent screw so it baint be one way plus think on hot days it needs to vent out Quote Link to comment Share on other sites More sharing options...
Saintly Fish Posted February 1, 2023 Share Posted February 1, 2023 1 minute ago, Captain Sensible said: One time when I sat accidentally on the fuel tank air came out the vent screw so it baint be one way plus think on hot days it needs to vent out But TBF you're not supposed to sit on them, so that's a mistake of the user not the tank. And I'd doubt a small puff of fumes would cause any issue at all. Same with the pressure venting. Ive only seen a plastic tank swell when left in direct sunlight, or in extra warm places. The bilge of a boat is not a particularly warm place. But it's like everything on a boat, check and maintain and you should be ok! Plastic fuel tanks are fitted to boats all the time, ok so they vent outside, but I can't see a 20ltr portable giving any issues if well cared for. Quote Link to comment Share on other sites More sharing options...
Andy135 Posted February 1, 2023 Share Posted February 1, 2023 Out of curiosity, why are you thinking of moving it forward? Balancing of weight/preventing porpoising? Quote Link to comment Share on other sites More sharing options...
Gordmac Posted February 1, 2023 Share Posted February 1, 2023 I suppose if you remember to shut the breather valve every time the engine is stopped you might be ok. I don't think I would risk it. Fuel tanks and gas lockers are externally vented for a reason. suzook12 1 Quote Link to comment Share on other sites More sharing options...
Odyssey Posted February 1, 2023 Share Posted February 1, 2023 It’ll be fine, just close the breather or remove the tank at end of trip. Quote Link to comment Share on other sites More sharing options...
Captain Sensible Posted February 2, 2023 Author Share Posted February 2, 2023 The boat is ass heavy - 30hp 90kg yam 4 stroke about double the weight of what it was built for (25hp two stroke ) In stern is also battery (not in a box) and fuel tank next to each other. Tank would go into open storage under cuddy I make the odd cup of tea in cuddy with stove (with hatch open) just occurred to me stove and venting tank might not be ideal - but then what the f do I know https://imgur.com/a/udO2V2G Quote Link to comment Share on other sites More sharing options...
Andy135 Posted February 2, 2023 Share Posted February 2, 2023 Why not put the battery (or two) up front instead? suzook12 1 Quote Link to comment Share on other sites More sharing options...
JonC Posted February 2, 2023 Share Posted February 2, 2023 3 minutes ago, Andy135 said: Why not put the battery (or two) up front instead? And the engine. Geoff, Saintly Fish and suzook12 3 Quote Link to comment Share on other sites More sharing options...
Andy135 Posted February 2, 2023 Share Posted February 2, 2023 9 minutes ago, JonC said: And the engine. Good thinking that man! Quote Link to comment Share on other sites More sharing options...
Captain Sensible Posted February 2, 2023 Author Share Posted February 2, 2023 Think you’ve nailed it, bow mounted outboard stick it in reverse. Jupiters Moon and Andy135 2 Quote Link to comment Share on other sites More sharing options...
Jupiters Moon Posted February 11, 2023 Share Posted February 11, 2023 (edited) My 520 was a little underpowered with a 25 4T on the back. I had a 2.5 aux engine which pushed it along nicely if needed( which it did a couple of times) but the extra weight at the stern bogged it down a bit. I moved the aux under the cuddy strapping it on top of a seat box and always carried the second fuel tank up front too when full( vent closed) I didn’t have a stove but these two actions trimmed the boat up nicely and gave me a couple of extra knots. When o did need the aux, it was light enough to easily manhandle on to its bracket( also kept it in better shape stowed up front. Edited February 11, 2023 by Jupiters Moon jonnyswamp and Saintly Fish 2 Quote Link to comment Share on other sites More sharing options...
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