HAVANA (Reuters) - Cubans still reeling from months of hours-long
  blackouts now have a new problem on their hands: fuel shortages.

  Many gas stations across the island have been shuttered for days as an
  unusually severe shortfall has left the nation nearly devoid of
  gasoline and diesel, stranding motorists and sprouting seemingly
  interminable lines at the pump in Havana.

  "We have been waiting for a fuel truck to arrive for three days," said
  Armando Corrales from the driver's seat of his gray Kia SUV at a gas
  station in the capital. "People have slept here in line so they don't
  lose their spot."

  The latest crisis comes on the heels of three nationwide blackouts in
  two months that left millions in the dark for days, prompting the
  communist-run government to temporarily close schools and non-essential
  industry.

  Cuba has yet to provide an explanation for the most recent shortfall.

  Only a comparative trickle of fuel has been served in Havana since
  Wednesday, according to a government application that records
  deliveries to individual gas stations.

  Officials have previously blamed fuel shortages on the decades-old U.S.
  trade embargo, which complicates Cuba's financial transactions, making
  it more difficult for the government to purchase fuel on the spot
  market.

  Cuba's long-time allies have reduced fuel shipments this year.
  Venezuela has sent 44% less crude and fuel to the Caribbean island
  during the January to November period, according to tanker monitoring
  data and documents from Venezuela's state company PDVSA.

  Mexico, which has become a regular supplier to the island, has made up
  for some of the difference. But both Venezuela and Mexico send mostly
  crude to Cuba, whose obsolete refineries must use it to make gasoline
  and diesel for cars, trucks and generators.

  Cuba this year began selling fuel in dollars at non-subsidized prices
  on par with regional neighbors. The government said this was necessary,
  in part, to raise enough foreign currency to ensure a steady supply at
  the pump.

  Even those far pricier "dollar gas stations" faltered this week, said
  Jorge Figueredo as he waited to pump fuel in the Havana suburb of
  Miramar.

  "The lines are now miles long even when you go to buy fuel in dollars,"
  Figueredo said.

  (Reporting by Dave Sherwood and Nelson Acosta, additional reporting by
  Carlos Carrillo and Mario Fuentes in Havana and Marianna Parraga in
  Houston; Editing by David Gregorio)