Fuel pumping assembly

A fuel pump assembly comprising:

• a fuel pump housing;
• a fuel pump module supported in the pump housing and including:
• a module housing including inlet and exhaust ports, the exhaust port extending generally axially through a lower wall of the module housing;
• an impeller rotatably supported within an impeller cavity formed in the module housing and rotatably driven by an electric motor, the impeller including axially upper and lower impeller vanes spaced around an outer circumferential periphery of the impeller;
• a generally semi-circular pumping channel including upper and lower pumping channel portions formed into the housing around a circular periphery of the impeller cavity, the impeller vanes being configured and positioned to move fluid through the upper and lower portions of the pumping channel, respectively, as the impeller rotates within the impeller cavity, the inlet and exhaust ports intersecting respective inlet and exit passages of the pumping channel;
• the exhaust port including:
• a trench formed in the module housing along a portion of a circumferential side wall of the module housing adjacent the outlet end of the pumping channel and opening axially upward;
• an opening from the exit passage of the pumping channel into the trench;
• and
• the exit passage of the pumping channel and the exhaust port opening being configured to allow a lower fuel stream propelled from a lower portion of the exit passage by the lower impeller vanes to remain parallel to and below an upper fuel stream propelled from an upper portion of the exit passage by the upper impeller vanes while flowing into the exhaust port trench.

A fuel pump assembly comprising:

• a fuel pump housing;
• a fuel pump module supported in the pump housing and including:
• a module housing including inlet and exhaust ports, the exhaust port extending generally axially through a lower wall of the module housing;
• an impeller rotatably supported within an impeller cavity formed in the module housing and rotatably driven by an electric motor, the impeller including axially upper and lower impeller vanes spaced around an outer circumferential periphery of the impeller;
• a generally semi-circular pumping channel including upper and lower pumping channel portions formed into the housing around a circular periphery of the impeller cavity, the impeller vanes being configured and positioned to move fluid through the upper and lower portions of the pumping channel, respectively, as the impeller rotates within the impeller cavity, the inlet and exhaust ports intersecting respective inlet and exit passages of the pumping channel;
• the exhaust port including:
• a trench formed in the module housing along a portion of a circumferential side wall of the module housing adjacent the outlet end of the pumping channel and opening axially upward;
• an opening from the exit passage of the pumping channel into the trench;
• and
• the exhaust port opening and trench being configured to allow lower and upper fuel streams from lower and upper portions of the exit passage, respectively, to both exit directly into the exhaust port trench.

A fuel pump assembly comprising:

• a fuel pump housing;
• a fuel pumping module supported in the pump housing and including:
• a module housing including inlet and exhaust ports, the exhaust port extending generally axially through a lower wall of the module housing;
• an impeller rotatably supported within an impeller cavity formed in the module housing and rotatably driven by an electric motor, the impeller including axially upper and lower impeller vanes spaced around an outer circumferential periphery of the impeller;
• a generally semi-circular pumping channel including upper and lower pumping channel portions formed into the housing around a circular periphery of the impeller cavity, the impeller vanes being configured and positioned to move fluid through the upper and lower portions of the pumping channel, respectively, as the impeller rotates within the impeller cavity, the inlet and exhaust ports communicating with respective inlet and exit passages of the pumping channel;
• the exhaust port including:
• a trench formed in the module housing along a portion of a circumferential side wall of the module housing adjacent the outlet end of the pumping channel and opening axially upward;
• and
• an opening from the exit passage of the pumping channel into the trench;
• the pump housing surrounding the fuel pumping module and defining a radially outer wall of the exhaust port trench disposed opposite a radially inner wall of the trench.