I have that problem. When I set de URL of my request from my table in Fusion Tables, the chart does not work. It say 'Request timed out' when I play the App.
The code is:
var graficoHistoricoMensual=Charts.newAreaChart() .setDataSourceUrl('https://www.googleapis.com/fusiontables/v1/query?sql=select%20ANO,MES,%20count(INCIDENCIA)%20AS%20TotalIncidencias%20from ID_OF_THE_TABLEwhere%20ALMACEN=501%20group%20by%20ANO,MES%20&key=THE_KEY&alt=csv')
.setDataViewDefinition(Charts.newDataViewDefinition().setColumns([0,1]))
.build();
When I executed this URL on one tab of the browser it work perfectly.
Does Fusion Tables work with Google App Script and this method of the Charts Services?