FUEL PUMP UNIT CONSTRUCTION/OPERATION [ZY, Z6]
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Fuel filter (high-pressure) is a built-in type in fuel pump unit
Fuel filter (high-pressure) is not a built-in type in fuel pump unit
Fuel Pump Unit
• Mainly consists of a fuel filter (high-pressure) (fuel filter (high-pressure) is a built-in type in fuel pump unit.), 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.
Pressure Regulator
• Built into the fuel pump unit due to adoption of a returnless fuel system.
• Mainly consists of a spring, release valve and diaphragm.
• Pressurizes fuel discharged by the fuel pump to approx. 380 kPa {3.87 kgf/cm2, 55.1 psi} using the spring, diaphragm and release valve, and then pumps it to the fuel distributor.
• If fuel pressure exceeds approx. 380 kPa {3.87 kgf/cm2, 55.1 psi}, the release valve opens to discharge unnecessary fuel pressure.
