Mazda 6 MPS 2005, Training Manual Supplement

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L3 Turbo Engine
Fuel Pump Unit
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The fuel pump draws fuel from the fuel tank and pumps it to the high pressure fuel pump.
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The fuel pump unit mainly consists of a fuel filter, pressure regulator, fuel pump, fuel
reservoir cup, suction filter, and jet pump.
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A pressure regulator has been built in the fuel pump unit due to the adoption of a
returnless fuel system.
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A hard-plastic fuel pump unit, with an integrated fuel filter (top side) and fuel pump, has
been adopted to simplify the fuel line.
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The fuel pump unit, located in the fuel tank, can be removed and installed through the
service hole in the bottom of the rear seat.
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Fuel in the fuel reservoir cup is drawn through the suction filter by the fuel pump, and
pumped to the fuel filter. Return fuel is sent back to the fuel reservoir cup or send to the
jet pump.
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A venturi, located in the path of fuel returning from the pressure regulator, creates
negative pressure that is used to transfer fuel from the reserve to the main tank.
Pressure Regulator
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The pressure regulator is built into the fuel pump unit due to the adoption of a returnless
fuel system.
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The regulator mainly consists of a spring and diaphragm.
01-36 Service Training Mazda6 MPS Supplement