Petrol supplies are critically low in the Outer Hebrides, with no new delivery scheduled until the end of this week.
Stations in North Uist, South Uist and Benbecula are all reporting shortages of fuel, though diesel appears to be in good supply.
Bayhead Shop said it had no supplies of unleaded petrol, as did Hillside filling station.
Katherine MacDonald of Crossroads and Seaview stations wrote on Facebook: "Unfortunately both filling stations on Benbecula are out of petrol as of this evening.
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"At Seaview, I have managed to turn the unleaded pumps off to prevent an airlock, leaving all the outdoor diesel pumps still running.
"At Crossroads, this is not an option, so unfortunately the outdoor payment terminals have been switched off for the night as of now.
"If you need diesel tonight, please head to Balivanich, not Creagorry.
"If you need diesel tomorrow, both filling stations will be open as usual.
"I’ll update on the petrol delivery as soon as I can."
Alasdair Allan MSP said: "Constituents in Uist have been in touch to report difficulties in obtaining petrol for their vehicles. Whilst I understand that diesel supplies remain unaffected, I have been making enquires for further information.
"Certas has advised me that the next petrol scheduled to arrive by ship in Loch Carnan is on Friday 20 March. In the meantime they are, I understand, making arrangements to transport petrol by road tanker on any available sailings over the Sound of Harris."
The shortage is likely tied to the ongoing war in the Middle East.
The United States and Israel launched strikes on Iran late last month, with retaliatory strikes by the Iranians hitting U.S bases in neighbouring gulf states as well as Israel.
The Iranian regime has partially blocked the Strait of Hormuz, through which 20% of the world's oil supply is shipped, but has said it will allow ships from countries not involved in the attack to pass.
Saudi Arabia, Iraq, Iran, Kuwait and the United Arab Emirates all ship oil via the marine passage, and make up five of the top 10 oil producers in the world.
The UK consumes approximately 1.4 million barrels of oil every day, of which only about half is produced domestically in the North Sea, and direct import of oil and gas from Russia, the world's third largest producer, has been banned since 2022.
Early on Tuesday, Iran hit a tanker anchored off the coast of Fujairah, one of about 20 vessels hit since Israel and the United States started the war on February 28.
With Washington under increasing pressure over rising oil prices, Brent crude, the international standard, remained over 100 dollars (£75) a barrel on Tuesday, up more than 40% since the war started.
U.S President Donald Trump said he had demanded that roughly a half-dozen countries send warships to keep the Strait of Hormuz open.
But his appeals brought no immediate commitments, with many saying they are hesitant to get involved in a war with no defined exit plan and sceptical that they could do more than the U.S Navy.
In an update issued at 4pm on Tuesday, Comhairle nan Eilean Siar confirmed that a tanker carrying petrol supplies has arrived in Uist this afternoon.
The statement read: "Certas Energy, CalMac and the Western Isles Emergency Planning Coordinating Group, have been working closely together to resolve the issue.
"Comhairle nan Eilean Siar’s care at home service has temporarily amended staffing schedules in Uist to account for the issue. The service appreciates the flexibility being shown by service users and staff at short notice."
A Certas Energy spokesperson said: “Poor weather prevented our tanker from being able to discharge at Loch Carnan, and strong winds have also led to cancelled inter-island ferries and delays to fuel deliveries to Uist.
“We have arranged for an additional delivery of fuel to arrive in Uist today (March 17), working with our partners and suppliers to restore full operations as quickly as possible."
