>I need a supply outputting 12V that can handle ~8A (it's for s fuel pump).
>The power can be 'dirty' I guess...since we've used a battery before.

Dave,

If you can lay hands on a used one, try the old Heathkit IP-2715 "Battery
Eliminator".  I've used one for more years than I can remember. It's
regulated, variable voltage, metered, and handles up to 20~25A
intermittently...

Mike Hardwick
Decade Engineering

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