Fuel Tank Compartment Seal - Moderated Discussion Areas

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Author Topic:   Fuel Tank Compartment Seal

boe_marsh posted 05-20-2012 09:13 PM ET (US)
I have an 1980 Outrage 21. I have just successfully re-laminated the tank cover--actually done by an experienced guy. On re-installation, should I try to seal the deck against any moisture intrusion? The set-up has the vent at the front of the tank; the gas gauge, in the center; and the filler and outlet fittings in the stern. Should I make an attempt to seal all these openings? Or leave them open to enable drying? If I seal them, how would one go about it? Thanks.
jimh posted 05-24-2012 07:42 AM ET (US)
On all Boston Whaler boats that I have seen, the removable portion of the deck--the fuel tank cover--was installed with a caulk sealant filling the gap between the removable cover and the deck. If there were any openings in the removable portion of the deck, such as access plates to permit access to the fuel tank connections, these access plates were designed to be water tight and were fitted with O-ring seals. Based on this, my impression is the fuel tank cover portion of the deck is intended to prevent water on the deck from entering into the fuel tank cavity. If you have refurbished the removable portion of the deck, when reinstalling that deck you should employ the same methods as Boston Whaler used originally.
thegage posted 05-24-2012 09:43 AM ET (US)
There is at least one exception to this, which is the 16SL, where it was designed for some portion of water on the deck to drain into the fuel tank compartment and then out into another compartment.
But I agree that most other covers should be sealed.
John K.
boe_marsh posted 05-24-2012 08:07 PM ET (US)
Thank you very much for your valuable advice. I will employ these techniques...really appreciated!!!!!!!!

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Author	Topic: Fuel Tank Compartment Seal
boe_marsh	posted 05-20-2012 09:13 PM ET (US) I have an 1980 Outrage 21. I have just successfully re-laminated the tank cover--actually done by an experienced guy. On re-installation, should I try to seal the deck against any moisture intrusion? The set-up has the vent at the front of the tank; the gas gauge, in the center; and the filler and outlet fittings in the stern. Should I make an attempt to seal all these openings? Or leave them open to enable drying? If I seal them, how would one go about it? Thanks.
jimh	posted 05-24-2012 07:42 AM ET (US) On all Boston Whaler boats that I have seen, the removable portion of the deck--the fuel tank cover--was installed with a caulk sealant filling the gap between the removable cover and the deck. If there were any openings in the removable portion of the deck, such as access plates to permit access to the fuel tank connections, these access plates were designed to be water tight and were fitted with O-ring seals. Based on this, my impression is the fuel tank cover portion of the deck is intended to prevent water on the deck from entering into the fuel tank cavity. If you have refurbished the removable portion of the deck, when reinstalling that deck you should employ the same methods as Boston Whaler used originally.
thegage	posted 05-24-2012 09:43 AM ET (US) There is at least one exception to this, which is the 16SL, where it was designed for some portion of water on the deck to drain into the fuel tank compartment and then out into another compartment. But I agree that most other covers should be sealed. John K.
boe_marsh	posted 05-24-2012 08:07 PM ET (US) Thank you very much for your valuable advice. I will employ these techniques...really appreciated!!!!!!!!