Twin model S7.4V (GM 454) engines approximately 9 years old. Starboard engine starts and runs great. Port engine starts then stumbles and stalls. If you spray a little starting fluid into the air box, the engine will pickup and smooth right out. It seems like after the initial start, the engine may run out of fuel and stall. There is fuel in the tanks, and the filters have been changed. Maybe there is a permissive for the high pressure injector pump after initial 3 second initial start pump sequence, but I cannot find any literature to tell me if this is true.