State Sen. Vincent J. Fumo has not publicly endorsed anyone in the April 22 Democratic primary race to succeed him, but he has been lobbying fellow legislators to get behind candidate Larry Farnese.

On Wednesday, 13 of the 21 Democrats in the state Senate endorsed Farnese and promised to raise $250,000 to support him in his race against civic activist Anne Dicker and union leader John Dougherty, a longtime Fumo foe.

Three of the 13 said yesterday that Fumo had spoken to them about Farnese’s candidacy.

Gary Tuma, a spokesman for Fumo, said the senator, who is stepping down after 30 years to fight federal corruption charges at a trial in September, would not publicly endorse any candidate.