Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 215Get this manual
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DIRECT FUEL INJECTION
aFuel Pressure Gauge (Should Indicate 89 psi (613.5 13.8 kPa)Fuel Pressure Test Valve
90-859494R1 JUNE 2000
Page 3B-25