UPDATE 2-Motor racing-F1 teams want 2010 rules scrapped

* Mosley says cap could be raised for 2010

* Confident Ferrari will stay

* Teams want 2010 rules scrapped (Adds FOTA letter, Domenicali quotes)

By Alan Baldwin

MONACO, May 24 (Reuters) - Formula One's governing body suggested on Sunday that a budget cap could be postponed to 2011 while teams called for next year's rules to be scrapped in return for a pledge to stay in the sport.

The governing International Automobile Federation (FIA) wants to introduce an optional 40 million pound ($63.74 million) cap for 2010 to help new teams enter and ensure the survival of existing competitors.

FIA president Max Mosley told Reuters at the Monaco Grand Prix, however, that a higher figure could be agreed for next year before the full cap in 2011.

Ferrari team boss Stefano Domenicali told reporters after the race that the teams association FOTA had written to the FIA seeking guarantees and putting forward their own proposals.

"What we have asked is to go back to the rules of this year, the 2009 rules," he said. "And then see together what we can do in order to make changes for the next year."