Mercury OptiMax 250 - High Pressure Electric Fuel Pump

DIRECT FUEL INJECTION
Page 3B-21
90-888438 JUNE 2002
High Pressure Electric Fuel Pump
1. Install Pressure Gauge Assembly (91-852087A1/A2/A3) to starboard fuel rail pres-
sure test valve.
NOTE: If low air or low fuel pressure is indicated, swap hoses between air and fuel test
ports. If low reading moves, gauge accuracy should be checked.
NOTE: After 15 seconds of cranking engine with starter motor, fuel pressure gauge
should indicate 90
± 2 psi (620.5 ± 13.8 kPa).
a
b
00149
a-Fuel Pressure Gauge [Should Indicate 90 ± 2 psi (620.5 ± 13.8 kPa)]
b-Fuel Pressure Test Valve