US STOCKS-Futures lose ground after June retail sales data

NEW YORK, July 14 (Reuters) - U.S. stock index futures briefly turned negative on Tuesday following a report that pointed to underlying weakness in consumer spending in June.

* A separate government report showed June producer prices rose 1.8 percent month over month.

* Stronger-than-expected results from Goldman Sachs Group (GS.N) had only a small impact on futures after stocks rallied on Monday in anticipation of strong earnings from the bank.

* S&P 500 futures SPc1 were 2.2 points higher but were about even with 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 DJc1 climbed 26 points, and Nasdaq 100 NDc1 futures shed 1.50 points. (Reporting by Ellis Mnyandu and David Gaffen; Editing by Padraic Cassidy)