New supplies of diesel would be in place at all New Zealand marine fueling stations by Friday, replacing stocks of fuel affected by an additive that clogs engine filters, NZ Refining Co. said on Tuesday. Many New Zealand fishing boats have been kept in port by the fuel scare while motorists were also reporting problems, because of an additive inserted at NZ Refining's refinery, which affected 350 million liters of diesel that had been produced since March; The company supplies more than 90 percent of New Zealand's diesel fuel. The additive is designed to help fuel flow in cold temperatures but instead can block up diesel engine fuel filters.