SERVICE MANUAL NUMBER 24
FUEL INJECTION DESCRIPTIONS AND SYSTEM OPERATION
FUEL PRESSURE REGULATOR ASSEMBLY
MEFI 1 and MEFI 2 Only: The pressure regulator is a diaphragm-operated relief valve with
fuel pump pressure on one side, and regulator spring pressure and intake manifold vacuum
on the other. The regulator’s function is to maintain a constant pressure differential across
the injectors at all times. The pressure regulator compensates for engine load by increasing
fuel pressure as engine vacuum drops. The fuel pressure regulator is located on the cool
fuel assembly.
71716
THROTTLE BODY ASSEMBLY
The throttle body assembly is used to control air flow into the engine, thereby controlling
engine output. The throttle valve within the throttle body is opened by the operator through
the accelerator controls. During engine idle, the throttle valve is almost closed, and air flow
control is handled by the Idle Air Control (IAC) valve, described later in this section.
THROTTLE POSITION (TP) SENSOR
The throttle body provides the location for mounting the Throttle Position (TP) sensor for
sensing throttle valve position.
a
75723
c
b
350
Mag MPI Shown - Scorpion Is Similar
a - Throttle Body
b - Idle Air Control (IAC) Valve
c - Throttle Position Sensor
Index
90-861327
OCTOBER 1999
Page 5D-33
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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Marine readers have rated Mercury MerCruiser Engines Service Manual Number 24 GM V-8 305 CID 350 CID 4.0 out of 4.0 based on 1 product reviews. Great performance engine.
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