By Muriel Boselli
PARIS (Reuters) - France would withdraw support from a U.S.-British plan to release strategic oil stocks if Socialist front-runner Francois Hollande beats President Nicolas Sarkozy in the presidential election run-off on May 6, the energy adviser to Hollande said on Thursday.
France joined Britain and the United States last month in talks to tap into strategic stocks, saying a move could happen in a matter of weeks.
While Sarkozy's right-leaning government is pushing for a drawdown of emergency inventories to cut fuel prices, the Socialists say stocks should only be used in case of a severe supply disruption, not to manage prices.
"Strategic stocks are here in case of a major supply crisis," Francois Brottes, energy adviser to Hollande told Reuters. He said a release was not part of the Socialist candidate's proposals.
Brottes said that a drawdown could leave France in a vulnerable state in case of a major supply crisis.
"This could potentially be dangerous," he said.
Fuel prices have been a high-profile electoral theme in France with diesel and gasoline prices at record highs. The United States also faces pressure over gasoline prices ahead of presidential elections later in 2012.
Hollande proposes to freeze retail fuel price increases for three months and to reinstall a system that reduces the amount of taxes included in the price of petrol when oil prices rise and to push taxes up again when crude prices fall.
Opinion polls predict Sarkozy will lose the presidential election. Latest polls put Hollande in a double-digit lead in a May 6 runoff after a first round of voting for five candidates that will be held on Sunday.
That would leave a two week gap for a release to be agreed to guarantee French support.
Jean-Marc Tenneson, head of France's emergency oil stocks agency, told Reuters the government had not yet been in touch with the agency concerning a potential release.
U.S. President Barack Obama discussed conditions on world oil markets during a video conference last Thursday with French President Nicolas Sarkozy, the White House said, but declined to say if they talked about the release of strategic reserves.
The U.S., Britain and France are considering releasing reserves without outside the coordination of the 28-member International Energy Agency which has coordinated previous emergency oil releases.
The IEA said last month it remained ready to act if market conditions warranted but in a monthly report said "the tide of remorseless market tightening looked to have turned".
Oil prices have dipped by some 5 percent since mid-March to $118 a barrel after rising by around 15 percent since the start of 2012 to $128 over tensions with Iran.
Many in France have voiced criticism of the release proposal, with consumer groups and experts arguing that a fall in fuel prices would be small.
They worry that inventories released on to the market would have to be purchased back at a later date, pushing oil prices back up again.
Nicolas Mouchnino, in charge of energy at consumer group UFC Que Choisir said a fall in fuel prices would be very short term.
"The problem is that the rise in prices is not a one-off but structural because demand is very strong," Mouchnino said.
(Editing by Dan Lalor, Richard Mably)