Mazda 2007 CX-9, Service Highlights

Page: 77 / 614

FUEL SYSTEM [MZI-3.5]
01-14–5
01-14
NONRETURN VALVE CONSTRUCTION/OPERATION [MZI-3.5]
id0114d1102100
•
A single valve type has been adopted.
•
Under normal conditions, this valve is closed as
shown by the dotted line. When refueling, it opens
to the position shown by the solid line due to the
flow of fuel. When refueling is finished, the valve
returns to the normal valve position due to spring
force.
End Of Sie
NG: FUEL PUMP
FUEL PUMP UNIT FUNCTION [MZI-3.5]
id0114d1101400
•
A mechanical returnless fuel system has been adopted.
•
The fuel pump siphons fuel from the fuel tank and pumps it to the fuel injectors.
•
To prevent decreased engine output from a lack of fuel supply when the vehicle is turning, the fuel pump has
been designed so the fuel supply always remains constant in the fuel reservoir cup.
End Of Sie
FUEL PUMP UNIT CONSTRUCTION/OPERATION [MZI-3.5]
id0114d1101500
Fuel Pump Unit
•
Mainly consists of a fuel filter (high pressure),
pressure regulator, fuel pump, fuel reserve cup,
and fuel filter (low pressure).
•
A pressure regulator is built-in due to the adoption
of a returnless fuel system.
•
A hard-plastic fuel pump unit, with an integrated
fuel filter (high pressure) and fuel pump, has been
adopted to simplify the fuel line.
•
The fuel pump unit can be disassembled.
•
Fuel in the fuel reserve cup is suctioned out
through the fuel filter (low pressure) by the fuel
pump, and pumped to the fuel filter (high
pressure). Return fuel is sent back to the fuel
reserve cup through the jet pump.
Pressure Regulator
•
Built into the fuel pump unit due to adoption of a mechanical returnless fuel system.
•
Mainly consists of a spring, release valve and diaphragm.
•
If fuel pressure exceeds the specified value, the release valve opens to discharge unnecessary fuel pressure.
End Of Sie
NG: QUICK RELEASE CONNECTOR
QUICK RELEASE CONNECTOR (FUEL SYSTEM) FUNCTION [MZI-3.5]
id0114d1151500
•
Quick release connectors that can be easily connected/disconnected have been adopted to improve
serviceability.
End Of Sie
VALVE POSITION DURING REFUELING
FUEL
FUEL TANK SIDE
NORMAL VALVE POSITION
ac9uun00000587
FUEL FILTER BODY
PRESSURE
REGULATOR
FUEL PUMP
SPACER
FUEL FILTER
(LOW PRESSURE)
O-RING
SENDER GAUGE
O-RING
ac9uun00000107
3423-1U-06H(01-14).fm 5 ページ ２００６年１１月２１日 火曜日 午後４時５６分