FUEL PUMP UNIT CONSTRUCTION/OPERATION [MZI-3.7]

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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.

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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.