Mercury Mariner Service Manual 6, 8, 9.9 210CC Sailpower, Page 45Get this manual
Fuel SystemTroubleshooting Problemswhich sometimes are thought to be caused by the fuel systemmay be something completely differentTroubles, that are caused by items 1-thru-5, listed belowalso maygive the impression that problem exists in the fuel system
1Spark plugs
2Ignition spark voltage3Cylinder compression
4Reed valves5Ignition Timing
Troubleshooting Charts
PROBLEM: Engine Turns Over but Will Not Start or Starts Hard when ColdPossible Cause
Improper starting procedure used Fuel tank empty or too low; improperly mixed fuelcontaminants (water, dirt, etc in fuelFuel tank air vent closed or restricted pinched or restricted fuel lineDirty or restricted fuel filterPrimer arm not depressing stem of primer diaphragm Choke enrichment valve not functioning Choke solenoid not operating (electric start models)An inlet needle (in ca rburetor) that is either stuck open or closed (A needlethat is stuck openwill cause flood ing condition needle, that is stuck closed, will prevent fuel from entering carburetor Rubber reed block sealwhich separates cylindersmay be damaged (not sealing)