Irvine-based American Savings & Loan Assn. suffered a net outflow of deposits of about $30 million, about the same rate as on Tuesday, according to officials of the Stockton-based thrift's parent company, Financial Corp. of America. They said the level of withdrawals was normal for March, when many depositors dip into their savings to pay income taxes. However, FCA Chairman William J. Popejoy revised his estimate of Monday's net deposit outflow upward by $19 million to about $79 million. FCA announced last week that it expects to report losses of between $500 million and $700 million for 1984.