1994 SN95 5L Shuts Down
 

Engine ran well for ~ 45 minutes. Started OK from hot and ran well for ~ 20 minutes and then spluttered to a stop as if no gas. The tank was 1/4 full, but the engine would not start - a major mis fire.
the fuel pump and filter are OK and there is good gas flow. Changed the ECM, but no. Any suggestions.