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Old 28 March 2010, 06:37   #11
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I am probably going to stick with the std 150L if I get a Vipermax, because a partly empty fuel tank "breathing" all the time (the volume of air in the tank expanding and contracting with temp changes) is likely to mean condensation inside the tank, and keeping a big one full all the time is just carting extra weight around.

Speaking of which, if I may make a minor thread hijack, what do we do about cleaning out a tank sealed under the deck when you get poo and water in it? My old Humber was easy, as the tank was in the console, so stick a jiggle syphon in it and "hoover" around the bottom with the end into a can at deck level, but I have no idea what to do if you can't get at it?
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Old 28 March 2010, 07:13   #12
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what do we do about cleaning out a tank sealed under the deck when you get poo and water in it? My old Humber was easy, as the tank was in the console, so stick a jiggle syphon in it and "hoover" around the bottom with the end into a can at deck level, but I have no idea what to do if you can't get at it?
Exactly the same technique. The underfloor tank is/should be accessible via the fuel sender. Lift/unscrew the deck fitting over the sender, unscrew the sender and hoover away with the removal line exiting a trunk and into a can below the hull

In addition, and I'm not judging, but you might consider not pooing in your new tank
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Old 28 March 2010, 09:24   #13
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Well I now have a 210 ltr tank ready for conversion .

However it looks very large and will be half in and out of the deck.

So i am now thinking maybe making a grp tank that will go under all the deck.

This is the type of resin

http://www.ecfibreglasssupplies.co.u...t/default.aspx

Seen a few posts on grp fuel tanks
anyone got any comments on a grp tank ?

GRP tank is fine for me! Just don't start sticking screws into the deck around the area of the tank

A call to Ospreys might well sort you out with a GRP tank if you want an "off the Shelf" ready made unit.
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Old 28 March 2010, 09:45   #14
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GRP tank is fine for me! Just don't start sticking screws into the deck around the area of the tank

A call to Ospreys might well sort you out with a GRP tank if you want an "off the Shelf" ready made unit.
I am thinking I may make it as part of the structure under floor
with baffle plates and on the out side of the tank continuing the line as the width stringers
and the same with the centre string as well.
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Old 28 March 2010, 11:05   #15
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I am thinking I may make it as part of the structure under floor
with baffle plates and on the out side of the tank continuing the line as the width stringers
and the same with the centre string as well.
There has been a thread on here before about fibreglass tanks. I have not made one, and am not an expert, but beware, from what I have read normal polyester resins are a no no for fuel tanks. Over time the fuel degrades the resin leading to blocked fuel lines etc.
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Old 28 March 2010, 13:07   #16
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In addition, and I'm not judging, but you might consider not pooing in your new tank

If he really wanted to tell us he could tell us WHY he pooed in his tank - then again if he REALLY wanted to push the boat out he could tell us HOW he pooed in his tank but NO pictures please!!

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Old 28 March 2010, 13:28   #17
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There has been a thread on here before about fibreglass tanks. I have not made one, and am not an expert, but beware, from what I have read normal polyester resins are a no no for fuel tanks. Over time the fuel degrades the resin leading to blocked fuel lines etc.
Yes there is a special resin you have to use to make a petrol or ethanol fuel tank
it's called crystic-199 resin.
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Old 28 March 2010, 14:05   #18
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I thought at least somebody would have said



Have you fellas never heard of a wide-necked funnel? And it's illegal to do it over the side in inshore waters

Anyway I never said it was me. Back into the realms of reality, thanks for the sensible replies

So all the Osprey underfloor tanks are GRP are they? For some reason I had assumed it was s/s but looking at the original quote it doesn't say.
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Old 28 March 2010, 14:30   #19
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Osprey Fuel Tanks

Yes, Osprey tanks are GRP. So no problems bonding them in!
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