Energy Minister Chris Bowen says about 312 of 8,000 Australian service stations lack diesel, mainly in rural areas.
Australia imports roughly 90% of its fuel, with strategic reserves covering 39 days petrol, 29 days diesel, and 30 days jet fuel.
Prime Minister Anthony Albanese urges public to use transport and limit fuel purchases, warning aftershocks from the Middle East conflict may persist.
Investors in energy, transport, tourism face risk of Q2 slowdown as diesel shortages could affect logistics, agriculture and holiday travel demand.