Prime Minister Bill English says no requests for help have been made to the government after a fuel line was cut to Auckland Airport.

English said it was too early to know whether the person who damaged the line on Northland farmland could face legal action.

However, he said the line was quite deep.

"They must have been very determined because I'm told it was reasonably deep. Of course that will be a question that will be answered afterwards.

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"But I'm advised that all the fuel that was leaked has been dealt with and they are remediating the site as we speak."

English said he had an update from Energy Minister Judith Collins and the chairman of Air New Zealand this morning.

"They have got some confidence that the different organisations are doing their level best.

"Everyone is very conscious of the inconvenience for travellers from any uncertainty. So it is very important that they are providing information to travellers as much as possible...Air New Zealand and the airlines are working very hard on changing their refuelling arrangements. That's the best thing they can do."

Speaking after a tour of Freshmax Orchards near Hastings, English said he was sure there would be more work done looking at the security of fuel supply.

"There have been a couple of studies done that looked at different alternatives for backing up the current infrastructure and the decisions were made that the investment required to double up would be too much.

"But I would expect that after this they will go back and have another look at it."

His own campaign could be affected with staff driving instead of flying, however that was the same situation all travellers were in, English said.

English is touring Hastings and Napier today, and at Freshmax Orchards was joined by Steven Joyce to announce a five-point plan for the economy.

The announcement was a wrap-together of existing policy including:

• Paying down debt to about 20 per cent of GDP in 2020 and between 10 and 15 per cent by 2025.

• Raise incomes through tax relief, starting from April 1 next year.

• Invest in infrastructure including new schools and hospitals.

• Roll out real time provisional and terminal tax for all businesses.

• Support business confidence with a pledge to not introduce new taxes.