Mazda 2006 MX-5 - Nonreturn Valve Function; Fuel Tank Side; Fuel System Flow Diagram; Fuel Tank Construction [Lf]

FUEL SYSTEM
01–14–4
RETURNEES FUEL SYSTEM OUTLINE [LF]
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• The returnees 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.
• The pressure regulator is built into the fuel pump unit in the fuel tank.
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RETURNEES FUEL SYSTEM OPERATION [LF]
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• Fuel in the fuel tank 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.
• After pressure regulation, unnecessary fuel is returned from the pressure regulator to inside the fuel pump unit.
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FUEL TANK CONSTRUCTION [LF]
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• Capacity is 48 L {12 US gal, 10 lmp gal}.
• Two rollover valves and a fuel shut-off valve are built-in. For the rollover valve and the fuel shut-off valve, refer
to the emission system.
• Made of steel.
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NONRETURN VALVE FUNCTION [LF]
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• Prevents fuel from spouting out due to evaporative gas pressure in the fuel tank when removing the fuel-filler
cap.
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NONRETURN VALVE CONSTRUCTION/OPERATION [LF]
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• A single valve type has been adopted.
• The nonreturn valve is built into the fuel-filler pipe
of the fuel tank.
• The nonreturn valve cannot be removed because
it is integrated with the fuel tank. Replace the fuel
tank if the nonreturn valve requires replacement.
• Under normal conditions, this valve is closed as
shown by the dotted line. When refueling, it opens
to the position shown by the solid line due to the
flow of fuel. When refueling is finished, the valve
returns to the normal valve position due to spring
force.
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VALVE POSITION
DURING REFUELING
FUEL-FILLER PIPE OF
FUEL TANK
FUEL
FUEL TANK SIDE
NORMAL VALVE POSITION
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