FUEL SYSTEM
01–14–5
01–14
FUEL PUMP UNIT FUNCTION [LF]
E5U011413350N01
• The fuel pump siphons fuel from the fuel tank and pumps it to the fuel injectors.
End Of Sie
FUEL PUMP UNIT CONSTRUCTION/OPERATION [LF]
E5U011413350N02
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 returnees 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 sectioned 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 or the fuel tank through the jet pump.
•
Pressure Regulator
• Built into the fuel pump unit due to adoption of a returnees fuel system.
• Mainly consists of a spring, release valve and diaphragm.
• Pressurizes fuel discharged by the fuel pump to approx. 390 kPa {3.98 kgf/cm
2
, 56.6 psi} using the spring,
diaphragm and release valve, and then pumps it to the fuel distributor.
• If fuel pressure exceeds approx. 390 kPa {3.98 kgf/cm
2
, 56.6 psi}, the release valve opens to discharge
unnecessary fuel pressure.
End Of Sie
FUEL PUMP UNIT
E5U114ZS5022
PRESSURE
REGULATOR
RESERVOIR CUP
FUEL FILTER
(LOW-PRESSURE)
JET PUMP
FUEL PUMP
RESERVOIR
CUP
JET PUMP
: PUMPED FUEL FLOW TO
FUEL DISTRIBUTOR
: RETURN FUEL FLOW FROM
PRESSURE REGULATOR
FUEL FILTER
(HIGH-PRESSURE)
E5U114ZS5002
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