Fuel Tank Side; Fuel System Flow Diagram [Mzi-3.5]; Returnless Fuel System; Returnless Fuel System Operation [Mzi-3.5] - Mazda CX-9 2007 Service Highlights

FUEL SYSTEM FLOW DIAGRAM [MZI-3.5]

FUEL FILTER (HIGH
PRESSURE)
2WD

FUEL TANK

FUEL PUMP UNIT
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RETURNLESS FUEL SYSTEM OUTLINE [MZI-3.5]
• The returnless fuel system reduces fuel evaporation in the fuel tank.
• The pressure regulator located in the fuel tank prevents fuel return from the engine compartment side, thereby
maintaining a low fuel temperature in the fuel tank. Due to this, formation of evaporative gas produced by a rise
in fuel temperature is suppressed.
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RETURNLESS FUEL SYSTEM OPERATION [MZI-3.5]

• Fuel is pumped out through the fuel filter (low pressure) by the fuel pump, filtered by the fuel filter (high
pressure), and then regulated to a specified pressure by the pressure regulator.
• The pressure regulated fuel is sent to the fuel injectors.
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NG: FUEL TANK
FUEL TANK CONSTRUCTION [MZI-3.5]
• Capacity is 76.0 L {20.1 US gal, 16.7 lmp gal}.
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NG: NONRETURN VALVE
NONRETURN VALVE FUNCTION [MZI-3.5]
• Prevents fuel from spouting out due to evaporative gas pressure in the fuel tank when removing the fuel-filler
cap.
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01-14–4
FUEL SYSTEM [MZI-3.5]
PRESSURE
REGULATOR
FUEL TANK
AWD
FUEL FILTER (LOW PRESSURE)
FUEL INJECTOR
FUEL FLOW
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: TO PCM
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