Mercury 3.0 Liter Service Manual Page 17
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90-898303 2-12
Fuel Pressure Regulator
The fuel pressure regulator is located on top of the vapor separator and is
continuously regulating fuel pressure produced by the electric fuel pump. The
electric pump is capable of producing90 psi (621 kPa) of fuel pressure.
NOTE: Units with external electric fuel pump limits pressure to 36–39 psi.
NOTE: Units with internal electric fuel pump limits pressure to 34–36 psi.
a) Spring
b) Fuel Rail Pressure
c) Vacuum Line To Intake Manifold
d) Diaphragm
e) To Return Fuel Passage In Fuel Rail
Fuel Injectors
The EFI injector is a solenoid- operated device, controlled by the ECM, that
meters pressurized fuel to a pair of cylinders. The fuel injectors are located
inside the induction manifold on the fuel rail.
The injector receives signals from the Electronic Control Module. These
signals (pulse width) open the pintle valve, allowing fuel to flow past the pintle
valve.
The injector’s tip has holes that control the fuel flow, generating a conical
spray pattern of finely atomized fuel at the injector tip. The pulse width will
widen (richer) or narrow (leaner) depending on various signals received from
sensors connected to the ECM.
Notes
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17
- Outboard V6 EFI 1
- Speed/Density System 5
- Ignition 10
- 2.4/2.5L Fuel Flow Component 15
- Fuel Pressure Regulator 17
- Fuel Injectors 17
- 1987–1999 2.4L & 2.5L 18
- 2000–2001 2.5L 18
- EFI Electrical Components 19
- 12 VOLT BATTERY 20
- FUEL INJECTORS 20
- 2.4L & 2.5L (1987–1999) 21
- 2-18 23
- VOLTAGE TEST CHART 24
- 2-20 25
- Ignition Systems 26
- 2-22 27
- 2-24 29
- Idle Stabilizer Shift System 31
- 2-28 33
- Theory of Operation 34
- #1 Cylinder Trigger Circuit 35
- Ignition Coil Circuit 35
- Stop Circuit 35
- Control Module 36
- Bias Circuit 36
- Shift Stabilizer Circuit 36
- Idle Stabilizer Circuit 36
- 2-32 37
- 2.0/2.5 LITRE 6 CYL.: 37
- 2-34 39
- Miscellaneous Checks 41
- Low Battery Voltage 42
- Ignition Spark Check 43
- 2-40 44
- Adjustment 45
- 2-42 46
- 2-46 49
- ECM Injector Driver Test 50
- Marine Diagnostics 51
- 824003 Fuel ECM 52
- Injector Test 53
- Multi Pulse Test 55
- 824003 ECM 56
- 2-56 58
- Programmable - ECM History 59
- 1995-2001 3.0L Fuel Flow 63
- ELECTRIC FUEL PUMP 65
- 3.0L Fuel Pump Test 67
- 3.0L ECM Wiring Diagram 68
- FLYWHEEL 73
- CRANK POSITION SENSOR 73
- THROTTLE POSITION SENSOR 73
- ENGINE TEMPERATURE SENSOR 73
- SHIFT INTERUPT SWITCH 74
- 3.0L LITRE 6 CYLINDER 74
- Operation of Warning Panel 75
- ENGINE OVER-SPEED 76
- 3 Function Gauge Wiring 77
- Injector Test (Cont.) 79
- Single Pulse Test 81
- 3.0L EFI Scan Data Worksheet 82
- Ignition ECM 83
- 3.0L PROM ID Chart 84
- 3.0L PROM ID Chart (Cont.) 85
- Oil Injection Components 94
- Priming The Oil Pump 95
- Priming Procedure – Method 1 96
- Ignition Coil 100
- Electronic Control Module 101
- Flywheel 102
- Crank Position Sensor 102
- 90-898303 103
- VISUAL INSPECTION 105
- SENSOR HEAT TEST 105
- SENSOR PRESSURE TEST 106
- DDT TEST 107
- Air Temperature Sensor 108
- VOLTAGE TEST 110
- Spark Plugs and Wires 113
- Main Power Relay 114
- Stop Switch Circuit 114
- Shift Interrupt Switch 114
- Water Sensing System 115
- 2002 Warning System Signals 118
- Guardian Protection System 119
- Guardian System Activation 120
- Smartcraft Data Worksheet 121
- Description 124
- Overview 127
- SmartCraft System Products 127
- SmartCraft System Rules 128
- System Monitor 130
- Section 5 - Product Changes 131
- Table of Contents 132
- Model Year Changes 133
- 2004 MY 134
- 2004 RUNNING CHANGE 134
- New Model - 200 HP 3.0 Litre 135
- Returnable Engine Carton 136
- Shift Link 3.0 EFI 139
- Starter Motor – 2.5 and 3.0L 140
- Control Harnesses 141
- New Decal Design 144
- Power Trim Rams 144
- Dielectric Grease 145
- Drive Shaft Seal Carrier 145
- Upper Engine Mounts 146
- Thermostat Discharge Fitting 146
- Special Tools 150
- Spark Board - P/N 91-850439T 153
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