JohnnieVee
Member
1990 Mercury Mariner 90Hp, 3 cylinder, 2 stroke. Engine has a 13x17p prop.
took it to the lake and ran it to see what it would do, RPM at WOT was 3000. Boat would not plane out, checked throttle at carbs, they were wide open. Engine sounded like it was under load. took back to the house. found oil line from oil pump off at the fuel pump, mumbled a few choice words, checked compression, all cylinders were at 130#.
Now the Question...... with that line coming off, would the fuel pump suck air from that port and not allow the engine to get to full RPM?
I did rebuild all 3 carbs and synced, checked reeds and they looked good, no deformity or discoloration, replaced plugs and fuel filter.
Haave not checked the output of the fuel pump as of yet.
Boat is a 1990 16' nitro.
took it to the lake and ran it to see what it would do, RPM at WOT was 3000. Boat would not plane out, checked throttle at carbs, they were wide open. Engine sounded like it was under load. took back to the house. found oil line from oil pump off at the fuel pump, mumbled a few choice words, checked compression, all cylinders were at 130#.
Now the Question...... with that line coming off, would the fuel pump suck air from that port and not allow the engine to get to full RPM?
I did rebuild all 3 carbs and synced, checked reeds and they looked good, no deformity or discoloration, replaced plugs and fuel filter.
Haave not checked the output of the fuel pump as of yet.
Boat is a 1990 16' nitro.