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In a fuel-injection system with a pressure regulator disposed in the middle of a fuel supply line and located upstream of a fuel injector for regulating the pressure of fuel flowing through the fuel supply line and for returning surplus fuel via the pressure regulator into a fuel tank, a reflux pipe

In a fuel-injection system with a pressure regulator disposed in the middle of a fuel supply line and located upstream of a fuel injector for regulating the pressure of fuel flowing through the fuel supply line and for returning surplus fuel via the pressure regulator into a fuel tank, a reflux pipe arrangement is located downstream of the fuel injector and connected at one end to the downstream end of the fuel supply line and connected at the other end to the fuel tank. A reflux control device is disposed in the middle of the reflux pipe arrangement for controlling a flow rate of the fuel flowing through the reflux pipe arrangement. The reflux control device is comprised of a reflux control valve or a fluid-flow restriction orifice member.

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1. A fuel-injection system comprising:a fuel tank storing fuel;a fuel injector injecting the fuel;a fuel pump inducting the fuel from the fuel tank and discharging pressurized fuel into a fuel supply line that is connected one end to the fuel pump and connected at the other end to the fuel injector;

1. A fuel-injection system comprising:a fuel tank storing fuel;a fuel injector injecting the fuel;a fuel pump inducting the fuel from the fuel tank and discharging pressurized fuel into a fuel supply line that is connected one end to the fuel pump and connected at the other end to the fuel injector;a pressure regulator disposed in a middle of the fuel supply line and located upstream of the fuel injector for regulating a pressure of the fuel flowing through the fuel supply line and for returning surplus fuel via the pressure regulator into the fuel tank;a reflux pipe arrangement that is located downstream of the fuel injector and connected at one end to a downstream end of the fuel supply line and connected at the other end to the fuel tank; anda reflux control device disposed in a middle of the reflux pipe arrangement for controlling a flow rate of the fuel flowing through the reflux pipe arrangement, wherein the reflux control device controls a flow rate of the fuel flowing through the reflux control device to a smaller value than a flow rate of the surplus fuel flowing through the pressure regulator to the fuel tank. 2. The fuel-injection system as claimed in claim 1, wherein:the reflux control device comprises a fluid-flow restriction orifice member. 3. A fuel-injection system comprising:a fuel tank storing fuel;a fuel injector injecting the fuel;a fuel pump inducting the fuel from the fuel tank and discharging pressurized fuel into a fuel supply line that is connected one end to the fuel pump and connected at the other end to the fuel injector;a pressure regulator disposed in a middle of the fuel supply line and located upstream of the fuel injector for regulating a pressure of the fuel flowing through the fuel supply line and for returning surplus fuel via the pressure regulator into the fuel tank;a reflux pipe arrangement that is located downstream of the fuel injector and connected at one end to a downstream end of the fuel supply line, the other end of the reflux pipe arrangement extending toward the fuel tank; andan orifice member constructed integral with the pressure regulator and disposed in a middle of the reflux pipe arrangement for restricting a flow rate of the fuel flowing through the reflux pipe arrangement wherein the orifice member controls a flow rate of the fuel flowing through the orifice member to a smaller value than a flow rate of the surplus fuel flowing through the pressure regulator to the fuel tank. 4. The fuel-injection system as claimed in claim 3, wherein:the orifice member comprises a fixed orifice whose passage area is dimensioned to be relatively smaller than a surplus-fuel-flow passage area of the pressure regulator. 5. A fuel-injection system for an internal combustion engine comprising:a sealed fuel tank storing fuel;a fuel injector injecting the fuel;a fuel pump inducting the fuel from the fuel tank and discharging pressurized fuel into a fuel supply line that is connected one end to the fuel pump and connected at the other end to the fuel injector, the fuel supply line comprising a distributor pipe located near combustion chambers of the engine and a feed pipe extending from the fuel pump to distributor pipe;a pressure regulator disposed in a middle of the feed pipe and located upstream of the fuel injector for regulating a pressure of the fuel flowing through the fuel supply line and for returning surplus fuel via the pressure regulator into the fuel tank without flowing through the distributor pipe;a reflux pipe arrangement that is located downstream of the fuel injector and connected at one end to a downstream end of the distributor pipe and connected at the other end to the fuel tank; anda reflux control device disposed in a middle of the reflux pipe arrangement for controlling a flow rate of the fuel flowing through the reflux pipe arrangement, wherein the reflux control device controls a flow rate of the fuel flowing through the reflux control device to a smaller value than a fl ow rate of the surplus fuel flowing through the pressure regulator to the fuel tank. 6. A fuel-injection system for an internal combustion engine comprising;a sealed fuel tank storing fuel;a fuel injector injecting the fuel;a fuel pump inducting the fuel from the fuel tank and discharging pressurized fuel into a fuel supply line that is connected one end to the fuel pump and connected at the other end to the fuel injector, the fuel supply line comprising a distributor pipe located near combustion chambers of the engine and a feed pipe extending from the fuel pump to distributor pipe;a pressure regulator disposed in a middle of the feed pipe and located upstream of the fuel injector for regulating a pressure of the fuel flowing through the fuel supply line and for returning surplus fuel via the pressure regulator into the fuel tank without flowing through the distributor pipe;a reflux pipe arrangement that is located downstream of the fuel injector and connected at one end to a downstream end of the distributor pipe and connected at the other end to the fuel tank; andan orifice member constructed integral with the pressure regulator and disposed in a middle of the reflux pipe arrangement for restricting a flow rate of the fuel flowing through the reflux pipe arrangement wherein the orifice member controls a flow rate of the fuel flowing through the orifice member to a relatively smaller value than a flow rate of the surplus fuel flowing through the pressure regulator to the fuel tank. 7. A fuel-injection system comprising:fuel storing means for storing fuel;fuel injecting means for injecting the fuel;fuel pumping means for inducting the fuel from the fuel storing means and for discharging pressurized fuel into a fuel supply line that is connected one end to the fuel pumping means and connected at the other end to the fuel injecting means;pressure regulating means disposed in a middle of the fuel supply line and located upstream of the fuel injecting means for regulating a pressure of the fuel flowing through the fuel supply line and for returning surplus fuel via the pressure regulating means into the fuel storing means;a reflux pipe arrangement that is located downstream of the fuel injecting means and connected at one end to a downstream end of the fuel supply line and connected at the other end to the fuel storing means; andreflux control means disposed in a middle of the reflux pipe arrangement for controlling a flow rate of the fuel flowing through the reflux pipe arrangement, wherein the reflux control means controls a flow rate of the fuel flowing through the reflux control means to a smaller value than a flow rate of the surplus fuel flowing through the pressure regulator to the fuel tank. 8. A fuel-injection system comprising:fuel storing means for storing fuel;fuel injecting means for injecting the fuel;fuel pumping means for inducting the fuel from the fuel storing means and for discharging pressurized fuel into a fuel supply line that is connected one end to the fuel pumping means and connected at the other end to the fuel injecting means;pressure regulating means disposed in a middle of the fuel supply line and located upstream of the fuel injecting means for regulating a pressure of the fuel flowing through the fuel supply line and for returning surplus fuel via the pressure regulating means into the fuel storing means;a reflux pipe arrangement that is located downstream of the fuel injecting means and connected at one end to a downstream end of the fuel supply line and connected at the other end to the fuel storing means; andfluid-flow restriction orifice means constructed integral with the pressure regulating means and disposed in a middle of the reflux pipe arrangement for restricting a flow rate of the fuel flowing through the reflux pipe arrangement, wherein the fluid-flow restriction orifice controls a flow rate of the fuel flowing through the fluid-flow restriction orifice to a smaller value than a flow rat e of the surplus fuel flowing through the pressure regulator to the fuel tank.