Viva Energy, the owners of the Geelong refinery, resumed trading on Monday after fire damaged parts of the facility on Wednesday.
The fire took place in the refinery's alkylation unit in its gasoline complex, the company said, with an equipment failure being blamed for the inferno.
In a statement to the ASX, Viva Energy said capacity was set to ramp up at the facility.
"Over the next few weeks, and subject to plant inspection, the company expects to be in a position to ... lift production of diesel, jet fuel and petrol to over 90 per cent of capacity," the statement said.
"The refinery is then expected to continue production at these levels until repairs are completed."
The refinery was at a 60 per cent output for petrol following the fire and at 80 per cent for both jet fuel and diesel.
Viva has promised a full investigation into the cause of the incident.
The company had been in a trading halt following the fire, but resumed on Monday morning.
Viva shares dropped by as much as 9.5 per cent when it came out of the halt and were sitting at $2.38 before noon, down about six per cent.
The Geelong facility is one of only two refineries operating in Australia and provides 10 per cent of the country's fuel supply and 50 per cent of Victoria's.
Production had been increased at the Geelong refinery following the Middle East war and closure of the Strait of Hormuz, which had placed pressure on global oil supply.
The conflict has led to a strain on trucking companies due to the rise in fuel costs.
Freight and trucking business from Monday were able to apply for interest-free loans to help weather the price hikes of doing business.
The loans were part of a $1 billion economic resilience program package and will apply to businesses that make or transport fuels, fertiliser and agricultural products.
The concessions were announced by Prime Minister Anthony Albanese during a speech at the National Press Club earlier in April.
Industry Minister Tim Ayres said the loans would provide stability during volatile economic times.
"Firms in supply chains that are facing escalating costs and short-term cash flow pressures have access to short-term zero-interest loans to make sure that they sustain their businesses through this short-term shock," he told reporters in Canberra.
"The billion dollar facility is there to be used as much as it is required."
Loans of up to $5 million are available for companies with a turnover less than $100 million.
Australian Banking Association chief executive Simon Birmingham said the financial sector would support the rollout of the loans.
"Banks are stepping up to support the rollout of these zero-interest loans to businesses who are doing it tough as a result of the current conflict in the Middle East," he said.
"This will be important support for impacted businesses in areas such as freight and logistics, fuel, fertiliser and plastics manufacturing."
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