G7 finance ministers earlier did not rule out adopting another part of the British plan - to guarantee borrowing between banks - as they issued a five-point communique in Washington.
They also kept open the possibility of further cuts in interest rates and taxes.
But BBC economics correspondent Andrew Walker, in Washington, says there is some disappointment that the G7 plan lacks detail.
Meanwhile, French President Nicolas Sarkozy and German Chancellor Angela Merkel said there would be no common financial rescue fund for Europe, like the US bail-out of Wall Street.
The two spoke on Saturday in eastern France where they were commemorating the 50th anniversary of Franco-German reconciliation after World War II.
Chancellor Merkel said "there is no question of a European fund", while Mr Sarkozy said such a move would pose "gigantic problems" in terms of co-ordination between European nations.
The German leader said governments must "redirect the markets so they serve the people, and not ruin them."
The two leaders said a common approach to the financial crisis would emerge from a Paris summit on Sunday of 15 eurozone leaders.
Gordon Brown, prime minister of the UK, will hold talks with Mr Sarkozy in the French capital before the meeting.
The heads of the EU's four biggest economies - Britain, France, Germany and Italy - held a first crisis summit last week but were split over the need for a common plan.
Analysts say another week of plunging stock markets has focused minds and the real test of this weekend's scramble by world leaders to shore up the international financial system will come once markets reopen again on Monday.
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