Trucks have successfully transported small amounts of jet fuel to Auckland Airport following the shortage crisis - but a big refill is on the way.

Refining NZ spokesperson Greg McNeill said tanker MV Matuku is loading at Marsden Point, and will depart tomorrow morning.

"That'll carry about 3.5 million litres of jet fuel, which is equivalent to about 120 road tankers," he said.

A replacement pipe piece has successfully been welded into place and has passed an initial inspection.

Mr McNeill said if it passes a second inspection they'll be moving into the pre-commissioning stage.

"That'll require a testing of the pipeline, and making sure that there's nothing in there," he said.

"We need to flush it, we need to purge it, to make sure there's nothing else in there that shouldn't be there."