Mercury 200 OptiMax Jet Drive, Service Manual, Page: 190 / 391

Direct Fuel Injection
90-8M0050731 MAY 2011 Page 3B-27
NOTE: After 15 seconds of cranking engine with starter motor, air pressure gauge should indicate 655.0 ± 14 kPa (95 ± 2 psi)
and fuel pressure gauge should indicate 751.5 ± 14 kPa (109 ± 2 psi).
a - Air pressure gauge
b - Fuel pressure gauge
c - Fuel pressure test valve
d - Air pressure test valve
Fuel or Air Pressure Not to Specifications ‑ SportJet Models
!
WARNING
Fuel is flammable and explosive. Ensure that the key switch is off and the lanyard is positioned so that the engine cannot start.
Do not smoke or allow sources of spark or open flame in the area while servicing. Keep the work area well ventilated and avoid
prolonged exposure to vapors. Always check for leaks before attempting to start the engine, and wipe up any spilled fuel
immediately.
1. If you suspect the fuel rails or a component of the fuel delivery system (electronic fuel pumps, VST, fuel lines, fuel rails, air
system), connect a dual pressure, liquid‑filled gauge to the port and starboard fuel rails and check both air and fuel pressure
together.
2. If fuel and air pressures are out of specification, refer to the following chart for help with system diagnostics.
3. Refer to
Electric Fuel Pump Pressure Tests
and
Air Compressor Pressure Test
for procedures on checking the fuel and
air system pressure.
4 0
2 0
6 0
8 0
1 0 0
1 2 0
1 4 0
1 6 0
4 0
2 0
6 0
8 0
1 0 0
1 2 0
1 4 0
1 6 0
a
b
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c
d