MULTI-PORT FUEL INJECTION DESCRIPTIONS AND SYSTEM OPERATION
SERVICE MANUAL NUMBER 23
FUEL PRESSURE REGULATOR ASSEMBLY
The pressure regulator is a diaphragm-operated relief valve with fuel pump pressure on one
side, 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 vac-
uum drops.
71716
THROTTLE BODY ASSEMBLY
The throttle body assembly is attached to the plenum. It controls engine output by regulating
the flow of air to the engine. The throttle valves within the throttle body are opened by the
operator through the accelerator controls. During engine idle, the throttle valves are almost
closed, and air flow control is handled by the Idle Air Control (IAC) valve, described below.
THROTTLE POSITION (TP) SENSOR
The throttle body provides the location for mounting the Throttle Position (TP) sensor.
b
a
c
75723
a - Throttle Body
b - Idle Air Control (IAC) Valve
c - Throttle Position Sensor
Page 5B-40
90-861326--1 MARCH 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 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 GM V8 GM V8 454 CID 7.4L and 502 cid 8.2L Marine Engines Service Manual Number 23 5.0 out of 5.0 based on 1 product reviews. Just need the manual. Wrote review. Can't technically review what I haven't seen yet...