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From what I understand, the newer Whalers were grounded to the negative side of the battery.
However, and this is a disclaimer:
Check with Boston Whaler before doing this to make sure it is safe.
Aren't we talking about a scarificial anode meant to prevent galvanic corrosion of the boat's metal parts? If you don't know where yours is (and maintain it) I believe that your internal tank and outboard's lower unit will start to look like swiss cheese especially in salt water. I think most modern outboards have their own anode which would mean it has to be maintained/replaced to protect your boat.
No Sailorman, it is not the same thing. What he's talking about is dispersing static electricity while refueling so vapors don't ignite. Not the same as galvanic corrosion.
Is this not an on deck portable or semi-portable tank?
If the tank is portable fill it outside the boat using the quick disconnect fitting for removal. If the weight of the full tank makes it too heavy to treat as a portable tank ensure the metal fuel fill nozzle remains in contact with the tank fill opening during on deck fueling.
On deck refueling is a low risk enterprise compared to filling below deck tanks. I would not worry about it. My old 13 Sport has a plastic on deck fuel tank thus making grounding a non-issue. I prefer plastic fuel tanks for this and other reasons.
Back in the day marinas had ground straps with clips attached to the fuel fill nozzles for direct grounding to tank fittings. I have not seen any on today's nozzles so they are probably no longer useful.
