Survivors (1975)

Season 1: Episode 12

When a flood destroys both their crops and stores, the survivors decide to trade the petrol in the tanker driven there by Donnie and Anne, as its the only thing of value they have left. Greg and Jenny set off in the tanker to trade with a nearby settlement. However they are followed by a man called Lawson and his two cronies, who want the petrol for themselves at any cost...