bypass channel contributing to a prevention of fuel remaining in the fuel line from entering the engine when the engine stops running and minimization of pollution occurring when the engine is re started application_number US 74924403 A description a preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings as shown in fig1 fuel pumped out from a fuel tank 11 via a fuel pump 12 is filtered at a fuel filter and is injected into an intake manifold of an engine 10 through an injector 16 a pressure sensor 17 and a regulator 30 are mounted at a return line 22 for adjusting the fuel pumped from the fuel pump 12 to be injected through the injector 16 to the engine at a constant pressure a fuel stopping solenoid valve 14 restricts the fuel from being provided to the injector 16 according to the on off state of the ignition key and a temperature sensor 15 measures fuel temperature both the fuel stopping solenoid valve 14 and temperature sensor 15 are mounted at a feed line 21 with reference to fig2 the regulator 30 comprises a housing 31 forming a chamber 32 by coupling with a valve seat 33 a fuel inlet 34 is at one side of the chamber 32 for allowing the fuel to flow therein from the return line 22 a fuel outlet 35 is formed at the valve seat 33 for guiding the fuel passed through a valve 36 to flow back to the return.