1992-2000 Mercury Mariner 105-225HP outboards Factory Service Manual, Page 234Get this manual

1992-2000 Mercury Mariner 105-225HP outboards Factory Service Manual, Page 234

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Pressure Regulator Test Purpose: This test will determine if weak, plugged or open pressure regulator is causing inadequate fuel pressure in the system
STEP 2: Turn ignition key switch to "ON" p