Delphi Corp.'s stock soars.

Byline: Jason Roberson

Sep. 21--DAYTON -- Delphi Corp.'s stock soared in midday trading Wednesday on news that it has not drawn the remaining $300 million under its $1.8 billion revolving credit line.

Typically seen as a prelude to bankruptcy, the Troy, Mich.-based auto parts supplier in August said it drew down $1.5 billion of its $1.8 billion credit line.

Delphi's notice, which was filed Wednesday with the Securities and Exchange Commission, squelched investors' hunches that the troubled auto parts supplier had completely drained this source of liquidity.

Shares of Delphi Corp. traded at $3.54 during midday trading Wednesday, up 52 …