LOS ANGELES (AP) _ Hollywood Teamsters union leaders on Monday discussed a tentative settlement to their 3-week-old strike, but would not disclose details.

Earl Bush, secretary-treasurer of the Hollywood drivers union, met Monday with representatives of striking studio electricians and laborers, and then went into a closed meeting.

''There's a news blackout on the negotiating committee,'' said Jim McCabe, a Teamster business agent. ''All I can tell you is that there have been meetings this morning, but at this point, no settlement has been reached.''

Herb Steinberg, a spokesman for the Alliance of Motion Picture and Television Producers, declined to comment.

The all-day sessions followed weekend negotiations in Florida between Teamster leaders and officials from the motion picture and television industry. The talks produced a tentative settlement, according to published reports.

The Teamsters had threatened last week to spread the strike across the country in an effort to stop all film and television production.

The possible settlement is subject to approval by North Hollywood-based Teamsters Local 399, which represents 2,200 striking studio drivers, and the 1,000 members of the electricians and laborers unions.

The Teamster drivers transport actors, equipment and props for television and film producers.

Their strike started Oct. 3 after contract negotiations collapsed over weekend work rules, salary rates, wages for out-of-town film and television production, studio seniority and guidelines for the making of non-union films. Some Teamster drivers were being asked to take a pay cut from $16.61 to $14 per hour, as producers said they faced competion from studios outside southern California.