Yes, Looked in there every year, inspect tank and hoses and foam, cleaned then sealed.
On most of the V20 models and years, that is a dry space. There is a pvc pipe running under the aluminum fuel tank to pass water from fwd bilge to aft blge.
That space does not drain to the bilge so you have to seal it. otherwise the water sits on top of the foam around the tank, some leaks down and corrodes the tank.
Use Window & Gutter silicone or 4000UV to seal. DO NOT USE 5200 or 4200 they are nearly impossible to remove
I'm not sure of the 1978 models. They did not have overboard deck drains and maybe didn't have foam around tank? They might have had saddle tanks???
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