I HAVE A 1996 MERC 115 THAT WILL NOT RUN ON CYLINDER NUMBER 3, THIS IS WHAT IVE DONE TO TROUBLESHOOT IT, CHANGED PLUGS,LEAK DOWN TEST,SPARK GAP TEST,CARB KIT,SPARK IS NOT THE ISSUE ITS FUEL RELATED, NOW WHEN I SQUEEZE THE FUEL BALL WHEN ITS IDLING IT WILL RUN ON ALL 4 CYLINDERS FOR A SECOND THEN GO BACK TO THREE CYLINDERS, COULD THIS BE THE ACCELLERATOR PUMP OR IS IT SOMETHING ELSE?aNY HELP IS GREATLY APPRECIATED