KATHMANDU, Nepal — Nepal began rationing fuel on Monday to cope with a worsening shortage brought on by continuing unrest over the country’s new Constitution and a dispute with neighboring India.

The country imports all of its fuel from India, but tanker trucks carrying fresh supplies have been blocked from crossing the border since late last week. “Things are completely out of order,” said Deepak Baral, a spokesman for the state-run Nepal Oil Corporation. “What we are doing now is just to continue emergency-only services.”

Mr. Baral said strict limits would be imposed on the sale of fuel to taxis, school buses, private cars, motorcycles and scooters. “Despite all these austerity measures, we will run out of fuel within the next 10 days,” he said.

Nepali officials blamed India for the shortage, saying it had ordered its border officials not to let the fuel trucks cross. But Indian officials said the disruption had been caused by mass protests in Nepal against the Constitution.