Disaster on my Sealine 220

nope - i'm pretty serious about speed and wash.

anyway tank out tomorrow so may have more idea than

Do you actually have proof that the tank is leaking yet? Surely it makes sense to fill it with water first and confirm there is a problem.
 
I had exactly the same problem with my 218. condensation caused the alloy tank to corrode from the underside, fuel fellout, Removed tank replaced with new, put on rubber feet, and also installed drain in tank tray moulding to prevent same happening again, Got great service from company in Wales who made tank to exact dimensions. Tank came out through boat, but had to take out the step, Gaffer tape all edges of joinery to prevent scuffing, And get new foam for the cushions. Good luck, and if you need contact for tank PM me.
 
Definitely not a commercial post here: We "probably", (as they used a few), manufactured your original tank for Sealine.
If it is the tank we can make you a replacement. We never weld tanks that have had petrol in as its just too risky, any repair is by definition a repair.
If the boat is a long term keeper buy a new tank.
PM me with tnak details and I can help.
We are only now getting asked to replace 25 year old Fairline Turbo 36 tanks etc. We just made them too good !
 
Had much the same problem a few years back with a sealine s240 (tank behind aft berth bulkhead), we pumped out petrol with a pella pump. although it's not recommended for this use it was straight forward enough.

You will be glad to hear the tank can be removed without cutting, it will pass through the aft berth once the bulkhead and lining are removed, getting the filler and breather fittings off is a struggle but it's definitely possible.

The tanks were alloy, made by 'The Tank Co', and the problem we found as already suggested was the corrosion under the foam mounting strips, possibly due to lack of air (guess) but definitely only where the strips touch the tank.

We had ours repaired with a process called 'Tank Re-Nu'.where they vulcanise the tank inside and out, like they do for obsolete car tanks, costs are around £150 inc freight if I remember.

Worth a try if all else fails.
 
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