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- Oct 25, 2011
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Re: 93 Bayliner 1800 Capri Outboard Restoration Project
Here's an aluminum gas tank installation guide of sorts and a 2nd.
Using foam for tank installation has the same problems as Jasoutside's concerns for using pour in foam in an aluminum boat: Trapped moisture between foam & tank causing corrosion & water logging the foam. No one plans to get enough water in their boat, and to let it sit long term enough to cause this kind of damage, but it does happen & once it does it is difficult to resolve the waterlogged foam which then causes the additional problems. Glass boats have wood encased in glass and you've already seen water intrusion does to the wood.
Well cared for & stored covered boats can also fall prey to condensation below decks because the smallest little pin hole in the glass work can let air be drawn below decks & once there hot & cold cycles can cause condensation. Be sure to drill drainage limber holes in all your stringers & bulkheads (Trooper82 has some good photos of the PVC cutouts he made for drainage in his Elko).
And my 1960 Glastron has an air expansion hose up under the deck. It is looped & faces downward, but the only purpose it seems to serve is to allow minimal air circulation during the heat cycling below deck because it isn't large enough to force much air into below decks:
EDIT: This pix should be rotated 90deg counterclockwise, loop runs UP & hose end points DOWN
Not to suggest that any of that ^^^ is a "Don't use pour in foam in a glass/tinny, or don't use foam to lock the tank in place once it's strapped & isolated" for or against foam usage in boats. It is information only.
Here's an aluminum gas tank installation guide of sorts and a 2nd.
Using foam for tank installation has the same problems as Jasoutside's concerns for using pour in foam in an aluminum boat: Trapped moisture between foam & tank causing corrosion & water logging the foam. No one plans to get enough water in their boat, and to let it sit long term enough to cause this kind of damage, but it does happen & once it does it is difficult to resolve the waterlogged foam which then causes the additional problems. Glass boats have wood encased in glass and you've already seen water intrusion does to the wood.
Well cared for & stored covered boats can also fall prey to condensation below decks because the smallest little pin hole in the glass work can let air be drawn below decks & once there hot & cold cycles can cause condensation. Be sure to drill drainage limber holes in all your stringers & bulkheads (Trooper82 has some good photos of the PVC cutouts he made for drainage in his Elko).
And my 1960 Glastron has an air expansion hose up under the deck. It is looped & faces downward, but the only purpose it seems to serve is to allow minimal air circulation during the heat cycling below deck because it isn't large enough to force much air into below decks:
EDIT: This pix should be rotated 90deg counterclockwise, loop runs UP & hose end points DOWN
Not to suggest that any of that ^^^ is a "Don't use pour in foam in a glass/tinny, or don't use foam to lock the tank in place once it's strapped & isolated" for or against foam usage in boats. It is information only.
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