More than 350 tonnes of heavy fuel oil have spilled into the water already, killing more than 1,000 sea birds.
Salvage crews have resumed pumping fuel from a stricken cargo ship listing badly on a reef off the northern coast of New Zealand.
An earlier attempt to remove the remaining fuel from the leaking Rena was abandoned a week ago due to bad weather.
Forecasts predict further poor weather for Monday night.
The Greek-owned and Liberian-flagged cargo ship ran aground on 5 October on Astrolabe Reef, 22km (14 miles) from Tauranga Harbour on New Zealand's North Island.
Environmentalists have warned of disaster if all 1,700 tonnes of oil and 200 tonnes of diesel held on board spill from the vessel.
Source: BBC News