More on EconomyFeb. 6 (Bloomberg) -- Ford Motor Co. may have to contribute $4 billion to its pension plan after a 2008 shortfall, a cash drain that risks dragging the second-largest U.S. automaker closer to a federal bailout. The collapsing stock market left the fund with a $4.1 billion deficit for its projected obligations, after 2007's $3 billion surplus, Ford said in its fourth-quarter financial results.