NEW YORK, Oct 1 (Reuters) - U.S. stock index futures briefly added gains on Friday after data showed consumer spending rose slightly more than expected, while a top Fed official said more action is needed to boost growth if the economy does not improve.
* Futures posted gains earlier in the session after a report showed Chinese manufacturing picked up in September.
* S&P 500 futures rose 5.7 points and were below fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures added 50 points, and Nasdaq 100 futures rose 14.50 points. (Reporting by Edward Krudy; Editing by Theodore d'Afflisio)