Around 40 First Union members who work at Allied Petroleum as Mobil tanker drivers are striking today which could upset petrol supply across New Zealand.
The strike came after repeated refusals from their employer to negotiate a collective agreement with the union that would set terms and conditions for their workforce.
Majority of the drivers taking the strike action are from the North Island.
Strike action is expected to last indefinitely.
Both Allied Petroleum and Mobil have been contacted by 1 NEWS for comment.
Allied Petroleum provides Mobil petrol and diesel to public transport infrastructure like bus depots, Kiwi Rail services and Auckland ferry services as well as direct to consumers at petrol stations.
Stay tuned for the latest news on our radio stations
