Mercury Mariner Service Manual 6, 8, 9.9 210CC Sailpower, Page 47Get this manual
PROBLEM 2: Engine Runs Uneven or SurgesPROBLEM 1: Engine Idles Rough and StallsPROBLEM 3: Engine Will Not Accelerate Possible Cause
Corrective Action
Fuel tank air vent closed or restrictedA pinched, cut or restricted fuel line; also loose fuel line connection dirty or restricted fuel fi IterRestricted filter in fuel tank Improperly mixed fuelcontaminants (water, dirt, etc in fuelAn inlet needle (in carburetor) that is either stuck open or closed (A needle, that is stuck open, will cause flooding conditionA needle, that is stuck closed, will prevent fuel from entering carburetor Incorrect low speed mixture adjustmentDamaged fuel pump diaphragm Carburetor is looseChamber cover leaking airIdle by-pass holes plugged Main well or idle air bleed plugged Improper main jet or restricted jetDamaged reed(s)Rubber reed block seal, which separate cylinders, may be damaged (not sealing)A crack in the fuel outlet tube (located in fuel tank)