Motoring organisations and road haulage groups have urged motorists in Scotland to refrain from panic buying amid anxiety about fuel prices.
Drivers queue for petrol in Glasgow on Monday evening
The RAC Foundation and Road Haulage Association in Scotland said a rush to the pumps would create a fuel shortage.
Hauliers stressed that while there may be protests over rising fuel costs at refineries elsewhere, there were no plans for demonstrations in Scotland.
Despite this, some filling stations are reported to have run out of fuel.
RAC head of campaigns Sue Nicholson said no-one wanted a repeat of the fuel crisis of 2000 when protests over prices led to a shortage.
She said: "Motorists are trying to keep their tanks full but they will actually end up creating a fuel shortage by not sticking to their normal buying habits.
"Although there's no actual shortage at refineries, this kind of panic-buying at the forecourt is exactly the sort of thing that causes the problem."
Phil Flanders, director of the Road Haulage Association in Scotland, said: "It could cause us major problems. If they drain the pumps that would put huge pressure on our deliveries."
On the issue of protests, he said: "I haven't heard of any plans for blockades or go-slows up here but that doesn't mean there aren't any plans under way.
"Hauliers feel very strongly about the fact our counterparts in Europe pay 17.5p per mile less for fuel than we do."
Environmental campaigners have urged Mr Brown to resist pressure for a cut in fuel duty.
Pumps have been running dry in several places
Duncan McLaren, chief executive of Friends of the Earth Scotland, said: "This is one time that the chancellor must stand tough with fuel protesters.
"There's nothing to complain about, the cost of motoring hasn't been this low for over a decade - the real price of fuel is climate change."
Demand for petrol has been high at a number of stations across Scotland.
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