Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 118Get this manual
Enrichment Valve Test 1234Remove top cowl
Remove ignition plate coverDisconnect YELLOWBLACK bullet connector (a) to enrichment valveRemove plug from YELLOWBLACK male connector (b) on ignition plate and connect male connector to female connector lead of enrichment valve
OVA TEST OF FUEL ENRICHMENT VALVE
TESTED PART OVA LEADS CONNECTED TO SCALE READING