A combination outlet valve and pressure relief valve for controlling outlet fuel flow of a fuel pump and for relieving over-pressurization downstream of said fuel pump, said combination outlet valve and pressure relief valve comprising: an outer housing having an outer housing passage extending therethrough from an outer housing inlet to an outer housing outlet; an inner housing located within said outer housing passage and extending along an inner housing axis from an inner housing first end face to an inner housing second end face, said inner housing having an outlet valve bore extending thereinto from said inner housing first end face and also having a pressure relief valve bore extending thereinto from said inner housing second end face such that said outlet valve bore and said pressure relief valve bore terminate at an inner housing wall which is traverse to said inner housing axis; an outlet valve assembly located within said outlet valve bore and comprising an outlet valve member, an outlet valve seat, and an outlet valve spring, said outlet valve member being moveable between 1) a seated position which prevents fluid communication between said outer housing inlet and said outer housing outlet through said outlet valve seat and 2) an unseated position which permits fluid communication between said outer housing inlet and said outer housing outlet through said outlet valve seat, said outlet valve spring being grounded to said inner housing wall and biasing said outlet valve member toward said seated position; and a pressure relief valve assembly located within said pressure relief valve bore and comprising a pressure relief valve member, a pressure relief valve seat, and a pressure relief valve spring, said pressure relief valve member being moveable between 1) a seated position which prevents fluid communication between said outer housing outlet and said outer housing inlet through said pressure relief valve seat and 2) an unseated position which permits fluid communication between said outer housing outlet and said outer housing inlet through said pressure relief valve seat, said pressure relief valve spring being grounded to said inner housing wall and biasing said pressure relief valve member toward said seated position, characterised in that the combination outlet valve and pressure relief valve further comprises an outlet passage located radially between said inner housing and said outer housing through which fluid flows from said outlet valve assembly to said outer housing outlet when said outlet valve member is in said unseated position and; wherein said outlet passage comprises a channel in an outer periphery of said inner housing and; wherein said outlet passage further comprises an outlet aperture extending radially through said inner housing from said outlet valve bore to said channel. an outer housing having an outer housing passage extending therethrough from an outer housing inlet to an outer housing outlet; an inner housing located within said outer housing passage and extending along an inner housing axis from an inner housing first end face to an inner housing second end face, said inner housing having an outlet valve bore extending thereinto from said inner housing first end face and also having a pressure relief valve bore extending thereinto from said inner housing second end face such that said outlet valve bore and said pressure relief valve bore terminate at an inner housing wall which is traverse to said inner housing axis; an outlet valve assembly located within said outlet valve bore and comprising an outlet valve member, an outlet valve seat, and an outlet valve spring, said outlet valve member being moveable between 1) a seated position which prevents fluid communication between said outer housing inlet and said outer housing outlet through said outlet valve seat and 2) an unseated position which permits fluid communication between said outer housing inlet and said outer housing outlet through said outlet valve seat, said outlet valve spring being grounded to said inner housing wall and biasing said outlet valve member toward said seated position; and a pressure relief valve assembly located within said pressure relief valve bore and comprising a pressure relief valve member, a pressure relief valve seat, and a pressure relief valve spring, said pressure relief valve member being moveable between 1) a seated position which prevents fluid communication between said outer housing outlet and said outer housing inlet through said pressure relief valve seat and 2) an unseated position which permits fluid communication between said outer housing outlet and said outer housing inlet through said pressure relief valve seat, said pressure relief valve spring being grounded to said inner housing wall and biasing said pressure relief valve member toward said seated position, characterised in that the combination outlet valve and pressure relief valve further comprises an outlet passage located radially between said inner housing and said outer housing through which fluid flows from said outlet valve assembly to said outer housing outlet when said outlet valve member is in said unseated position and; wherein said outlet passage comprises a channel in an outer periphery of said inner housing and; wherein said outlet passage further comprises an outlet aperture extending radially through said inner housing from said outlet valve bore to said channel.