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Mount above-deck gas tank below-deck?
On a new-to-me Cal 27, the p.o. installed an outboard engine to keep sailing despite a dead inboard (which I intend to remove). He just kept the gas tank sitting on the cockpit floor full time. Needless to say, I find this arrangement dissatisfying. Long term, I'll probably install a new diesel or an electric, but for now, the outboard stays.
Is it a horrible idea to move the gas tank below deck? I mean, yes, it's a horrible idea, but just how horrible? If I install a vent hose on the tank that runs to an outlet on the transom, and run the fuel line through the transom to the engine, is that really any different from a standard belowdeck setup? I can use the old engine blower to vent the bilge and will be removing the tank when I fill it. I'd rather not invest the money & effort for a "proper" belowdeck fuel tank and deck fill and fuel gauge and all that goes with it, just to remove it all in a couple years anyway. Engine use is just in-out of the slip and occasional no-wind get-home-faster trips of an hour max.
I also don't want an early, fiery death.
As a reference point, on my Santana 22, the 6 gal "above deck" style gas tank for the outboard was stored on a platform inside the lazarette full time, even when in use. Boat didn't blow up. Granted, a full bulkhead separated the lazarette from the cabin (although the lazarette was probably 25% of the boat's volume). All Santanas have the same setup, and no one has made issue of it. Probably many other small boats do the same.
My only other option is to mount it on the pushpit, which offers its own set of problems.
Anyone have ideas or suggestions?