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  1. #11
    Join Date
    May 2001
    Location
    UK East Coast
    Posts
    30,549

    Default Re: replacement fuel tank conundrum in westerly longbow.

    Quote Originally Posted by steve yates View Post

    The issue is; in situ is a 110l tank, and a custom built tank, that can fit through the access aperture of 455mm sq, can only hold approx 70l.
    (450mm sq, for clearance, and max 385mm high (current tanks height) to allow for the connections between tank and cockpit sole.

    The max depth here available is 520mm between the bearing and underside of the cockpit sole.
    Why not consider a different filler arrangement? If you fit a small round access hatch instead of the existing filler on the cockpit floor, you could have a filler cap on the top of the actual tank. Then have a tank made 450mm square and say 500mm high, giving you 100 litres capacity.

  2. #12
    Join Date
    Nov 2001
    Location
    Muchalls
    Posts
    1,105

    Default Re: replacement fuel tank conundrum in westerly longbow.

    I agree with Vic but as the owner of a Longbow - same hull as yours I think - taking the tank out via the hatch in the cockpit may be restricted by the size and shape of your engine. I had a Volvo MD3B, the three cylinder one, and there was no way the fuel tank would wiggle past it!
    Anyway, my suggestion would be a smaller, standard size plastic tank and another spare tank. We changed this year from a spare 20l metal jerry can to two 10l plastic cans and they are so much easier to carry to a petrol station or manoeuvre into the locker.

  3. #13
    Join Date
    Feb 2008
    Location
    Suffolk
    Posts
    3,211

    Default Re: replacement fuel tank conundrum in westerly longbow.

    I had a similar problem on my Moody33 - the tank was leaking so had to be replaced. Impossible to get out through the hatch so cut up into 3 pieces in situ and removed. I re[laced with a Plastimo tank, also try Vetus and Osculati who all supply 'standard , tanks. Another company is caktanks.co.uk who specialise in caravan, motorhome, horseboxes, campervans etc(and seem to be cheaper than 'marine' tanks!

  4. #14
    Join Date
    Oct 2014
    Location
    Keswick, Cumbria
    Posts
    1,202

    Default Re: replacement fuel tank conundrum in westerly longbow.

    So, I suggested my idea of cutting up the floor/extending the hatch, and the yard had a look and came back with what looks like a much better suggestion.
    "Rather than extending the current access hole we would be able to alter your cockpit floor making it removable for when you require full access to the tank, and when put back down it would not look much different to how it looks now. This would also negate the need to construct a new fibreglass access hatch lid, as well as significant additional bracing which would be required.

    The plan would be to cut the cockpit floor above the existing bearers (of a decent size), detaching it from the existing bearers in the process.
    This would then give huge access to the void beneath, where a large diesel tank can be fitted.
    After fitting we would place the cockpit floor back down into its original position (We would need a small amount of bracing to one edge, and would need to apply some waterproof coating to the bearers), however rather than glassing it back down it would be sat on a bed of sealant and screwed down around the edges with stainless steel countersunk screws. Therefor if you need to raise the floor in the future all that would be required would be to remove the screws and slit the sealant.

    Your wooden false floor would also sit back into place without modification.

    What are your thoughts on this? It would not change the originality of the boat, allow a good size tank installation and be completely watertight.

    Once query which has come up is the location of the tank filler. It may be prudent to move the tank filler to a deck mounted filler. It would make fitting the tank much easier, and reduce the chance of filling the cockpit with diesel should a spillage occur when refuelling.

    Estimate:

    To remove the existing cockpit floor, tidy up edges and form replacement bearer.
    Install new fuel tank
    Replace cockpit floor, sealing down onto a bed of sealant, ensuring waterproofing and strength

    832.53 + VAT *

    * Please note this does not include the cost of the new tank or tank fixings required, but does cover installation.
    "
    I could then put a 170l tank like this https://www.asap-supplies.com/vetus-...-page-product3. It's more expensive, but it seems to me to be a solution good for another 20 plus years, and give me a robust fuel supply on par with the new engine the boat already has.
    A 42l tank would be a lot cheaper, but it would feel like a stop gap, and I would still want the job done properly. If I don't have it done, it's a 1500 bill to truck her back anyway. With a new tank and that much capacity, I can just sail her back, especially if I get a weather window like this one

    What do you folk think of the plan, any big downsides that I am unaware of? Is it overkill? Anyone ever done anything similar?

    Thanks, steve



    What do you guys think of that idea,

  5. #15
    Join Date
    Apr 2009
    Posts
    3,628

    Default Re: replacement fuel tank conundrum in westerly longbow.

    Quote Originally Posted by steve yates View Post
    "
    I could then put a 170l tank like this...
    Would you get through 170l in a season?

  6. #16
    Join Date
    Sep 2008
    Location
    Pin Mill/Cambridge
    Posts
    740

    Default Re: replacement fuel tank conundrum in westerly longbow.

    Sounds like a thoroughly sensible solution
    ' The gods do not deduct from a man's allotted life span, his days spent sailing '

  7. #17
    Join Date
    Aug 2013
    Location
    SW Scotland
    Posts
    15,785

    Default Re: replacement fuel tank conundrum in westerly longbow.

    Quote Originally Posted by steve yates View Post
    I could then put a 170l tank like this https://www.asap-supplies.com/vetus-...-page-product3. It's more expensive, but it seems to me to be a solution good for another 20 plus years, and give me a robust fuel supply on par with the new engine the boat already has.
    I suspect that I have missed an earlier part of a saga, but why would you need 170l of diesel? Is it for running heating while you're living aboard? If you don't get through it reasonably quickly, and at least once a year, that's going to be an awful inviting diesel bug farm.

    That said, it sounds like a good scheme, at a pretty reasonable price. Could you fit two or three smaller tanks in the space and keep all but one dry when you're not doing long distance stuff?
    "Seamen are always wanting to do things the proper way; and I like to do them my way."

  8. #18
    Join Date
    Oct 2014
    Location
    Keswick, Cumbria
    Posts
    1,202

    Default Re: replacement fuel tank conundrum in westerly longbow.

    I wouldn't NEED 170l cruising uk coastal waters, but it could be useful to have for going further afield to the Faroese or Iceland, or across the Atlantic.
    She will prob be in the med for a while in a few years, and it sounds like a lot of motoring could be on the cards there.

    For delivering her round lands end in winter to Essex, I want the ability to punch against wind and tide all day if required, which burns approx 3l/hr, and I don't want to have to keep seeking the shore and fuel supplies
    I used approx 120l / 300miles/ 50 hrs between maryport and milfordhaven,

    But the main reason is there is very little relative difference in the price of the fuel tanks, 60 difference might be another 100l, so better to have it than be compromised without it.
    I don't have to fill it to the brim all the time, and I don't really believe in the condensation of water theory inside the tank.
    If I was happy with 42l, it would be job done,

  9. #19
    Join Date
    Mar 2008
    Location
    Argyll
    Posts
    5,057

    Default Re: replacement fuel tank conundrum in westerly longbow.

    Well, it will certainly keep the rudder in the water. It seems an awful lot of fuel to carry probably about twice what most people would need and if it is half full the tank baffles will need to be effective to keep it from slapping about, 100 litres of fuel is a fair weight.
    But my main concern would be the joint between the floor upstand and the cockpit sides, if it is really water tight (and surely it needs to be?) it will be very difficult to remove. Since the tank should not need to come out again for about 20 years or so. why not just glass the floor back in. If you imagine a box , it depends for its strength and stiffness on the bracing provided by the shape so the bottom is much stiffer than the top. To compensate for this loss of strength you may need to use stringers round the edge of the new opening with strong joints at the corners, I think I would be happier to restore the shape and cut it out again in 2040 if necessary.

    Edit,
    Looked again at your proposed tank , the moulding divides it effectively in to two so it is well baffled.
    Last edited by Quandary; Today at 09:27.

  10. #20
    Join Date
    Aug 2013
    Location
    SW Scotland
    Posts
    15,785

    Default Re: replacement fuel tank conundrum in westerly longbow.

    Quote Originally Posted by steve yates View Post
    I don't have to fill it to the brim all the time, and I don't really believe in the condensation of water theory inside the tank.
    Neither do I. It's more the matter of fuel containing biodiesel sitting in the tank for long periods which would worry me. In your case I think I would fit a 40l tank for general use and a 130l one to fill only for long range trips.
    "Seamen are always wanting to do things the proper way; and I like to do them my way."

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