Collins Street has reopened to traffic after a diesel spill at the Reserve Bank forced its closure between Spring and Exhibition streets on Tuesday afternoon.

The Melbourne Fire Bridge attended a large diesel spill at the Reserve Bank, near the corner of Collins and Exhibition streets just after midday.

Firefighters outside the Reserve Bank. Credit:Nino Bucci

About 3000 litres of diesel fuel spilled in the basement car park of the building.

The CBD street was closed for more than three hours, reopening about 3.30pm.