Starcraft 221V gas tank question

[KevinHall]

After hearing all the good advice of folks on here, I'm going with rigid foam in my rebuild. My question is, do you just cut it and pack it tight around the tank to achieve the same effect of the expansion foam? Is the rigid gas resistant? Or is this the one spot on the boat where some form of expansion foam goes back in? I'm replacing the wood and the strips of rubber, just wondering how everyone secured the tank tightly around the sides.

 

[Woodonglass]

No, the rigid foam is NOT gas/oil resistant. You can wrap your tank in plastic prior to pouring the 2-part foam to keep it from adhering to the tank. If you do careful calculations on the cubic feet of space you should be able to get a good pour to fill the exact space IF the temps are in the 90's.

 

[KevinHall]

So all the guys that have used rigid pink foam to replace the foam in these StarCraft boats has still used pour in foam around the tank area?? Are there any other options?

 

[Woodonglass]

This may help...http://www.yachtsurvey.com/fueltank.htm


http://www.fishyfish.com/mytolman46.html

 

[oldhaven]

I read your other posts and do not know whether your tank is metal or plastic, but if it is resin/plastic do not pour foam it in. With the rigid stuff you can leave some expansion space. It also seems like poured in foam around a metal tank could trap corrosive liquid unless it is very well encapsulated.

From Jamestown distributors website and others like it:

IMPORTANT: Do not use foam to secure tank in place. Resin fuel tanks require a multidimensional expansion area of 2.3% at all times; foaming a tank in place removes the chance for hydrocarbon expansion and will void tank warranty

 

[KevinHall]

It's a metal tank. I was sitting on a wood board, with two rubber strips. I had to chip away expansion foam around all sides and pry it up. There was a bit of foam under it too. This was factory, as this boat has never been apart.

 

[Woodonglass]

Kevin, it's also best to keep ALL your posts about your boat project in ONE thread. You can ask a MOD to move this one into your main thread.

 

[DeepBlue2010]

Don't use foam at all to secure the tank. Never mind it is factory, it doesn't necessarily mean it is best way to do. Could be faster or more economical or simply just good enough but not necessary the best. Read the two links WoodOnGlass posted above. I would also give my tank a good prepping and epoxy coating before I put it in.

 

[KevinHall]

Thanks guys, much appreciated. I didn't put this in the restoration post because it was a specific question about the tank, and I didn't think anyone would see it if it were under that general title. Thanks for the help.