Patent ID: 6915787

Claim:
A fuel supply apparatus comprising: a cover ( 3 ) fitted to an opening ( 2 a ) of a fuel tank ( 2 ), and on which a discharge pipe ( 7 ) is disposed; a fuel pump ( 4 ) for delivering under pressure fuel from said fuel tank ( 2 ) to an injector of an engine via said discharge pipe ( 7 ); a fuel filter ( 5 ) for filtering the fuel discharged from said fuel pump ( 4 ); and a fuel pressure regulator ( 60 ) for regulating the pressure of the fuel discharged from said fuel pump ( 4 ) to a predetermined pressure (Pi); wherein said fuel pressure regulator ( 60 ) includes: a first chamber ( 62 ), formed in a case ( 61 ), into which fuel discharged from said fuel pump ( 4 ) flows, and a second chamber ( 63 ), into which the fuel flows via the first chamber ( 62 ); a fuel control means ( 64 ) disposed between said first chamber ( 62 ) and said second chamber ( 63 ), for limiting fuel flowing from said first chamber ( 62 ) into said second chamber ( 63 ); a pilot valve unit ( 65 ) having a passageway for opening to discharge fuel into said fuel tank ( 2 ), when the fuel pressure in said second chamber ( 63 ) is more than a first set pressure (Pp); and a main valve unit ( 66 ) for opening and closing to discharge fuel into said fuel tank ( 2 ), when the fuel pressure in said first chamber ( 62 ) is equal to a second set pressure (Pm) between the first set pressure (Pp) and the predetermined pressure (Pi).