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Dont forget to add a 'flame arrestor screen' on the vent outlet of your tank .... just a finely woven stainless steel screen between the hull/transom and the clamshell, etc. that protects the vent opening.
Such prevents gas tanks from going *boom* if there are any 'sparks', etc. near the vent opening ... and is required by ABYC and your insurance carrier.

You'll also need to add a USCG approved ignition-proof 'bilge blower' and non-flammable ducting ..... to be run for several minutes to evacuate any heavier than air gasoline fumes from the bilge and other 'low' spaces.
 

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Rich, hang on there a sec.. the OP's got an outboard. It's only the tank that's in the boat. ;)

My advice would be to plumb the tank vent into the cockpit so that any flammable vapours don't get into the bilge whilst he's filling the tank- but other than that, as Sony2000 points out,he should be good to go.
I perceive that the OEM diesel tank is INSIDE the boat ... and would be required to follow the same USCG regs as any 'inboard' fuel installation. ;-)
 
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