Try NAPA or similar,... they used to have a plastic tank repair kit... for small holes.
Mine was melted from a long term exaust leak blowing on it,... it's a wonder the former owner didn't imolate himself. The patch kit wouldn't work on that big a soft/holey area.
Metal,... take it off, fill it with water, then braze the hole. or JB Weld might work
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