Vapor separator for a fuel pump assembly

A fuel pump assembly for an internal combustion engine comprising:

• a housing;
• an electric high pressure fuel pump supported by the housing;
• and
• a vapor separator supported by the housing, the vapor separator having:
• a first cap defining a vapor outlet passage and an opposing second cap defined by the housing, wherein the housing extends axially between the first and second caps,
• a heat conductive cylindrical sleeve engaged axially between the first and second caps and spaced radially inward from the housing,
• a fuel chamber defined within the sleeve,
• a coiled baffle spiraling between the housing and the sleeve and extending longitudinally between the first and second caps, the baffle having a plurality of windings spaced axially with respect to the vapor separator, wherein each winding extends laterally radially between the housing and the sleeve,
• a spiral coolant channel defined between the housing, the sleeve and the baffle, the coolant channel having a first end disposed near the first cap and an opposite second end disposed near the second cap,
• a coolant inlet passage communicating with the first end of the coolant channel, and
• a coolant outlet passage communicating with the second end of the coolant channel.

A vapor separator for a fuel pump assembly of an internal combustion engine comprises:

• an elongated heat conductive sleeve defining a fuel chamber;
• a housing surrounding and spaced laterally outward from the sleeve;
• an elongated baffle extended laterally between the housing and the sleeve;
• a coolant channel defined longitudinally by the baffle and carried between the housing and the sleeve, the coolant channel being segregated from the fuel chamber and having a first end and an opposite second end;
• a coolant inlet passage communicating with the first end of the coolant channel;
• a coolant outlet passage communicating with the second end of the coolant channel;
• and
• wherein the heat conductive sleeve is formed from thermally conductive plastic.