If you tape the end of a shop vac to the tank filler and let it run, you will be able to unscrew the hoses with minimal fuel loss. Just a bit fiddly and you "may" need to partially, not totally, block the tank vents.
X,
I was going to suggest that but did not want to deal with the naysayers. I used that method on a home oil tank with complete success.
Rob
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North Pacific 45
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