Fuel transfer apparatus

A fuel supply system including a fuel tank, a feed conduit through which fuel is pumped from the fuel tank, and a normally open return conduit through which excess fuel is returned to the fuel tank, comprising:

• the fuel tank having first and second sumps separated from each other;
• and
• an ejector pump having a pressure chamber opening through a throat into the first sump, the pressure chamber being connected through a communication conduit to the second sump, and a fuel nozzle having an inlet port connected to receive a gravitational free fall of fuel through the return conduit and discharge holes opening into the pressure chamber at an angle with respect to the axis of the fuel nozzle for discharging fuel in the form of a cone-shape jet into the pressure chamber to create a negative pressure in the pressure chamber so as to suck fuel through the communication conduit from the second sump.

A fuel supply system including a fuel tank, a feed conduit through which fuel is pumped from the fuel tank, and a normally open return conduit through which excess fuel is returned to the fuel tank, comprising:

• the fuel tank having first and second sumps separated from each other;
• and
• an ejector pump having a pressure chamber opening through a throat into the first sump, the pressure chamber being connected through a communication conduit to the second sump, and a fuel nozzle having an inlet port connected to receive a gravitational free fall of fuel through the return conduit and a discharge end opening into the pressure chamber for discharging a jet of fuel into the pressure chamber to create a negative pressure in the pressure chamber so as to suck fuel through the communication conduit from the second sump, the fuel nozzle having an inner surface formed with a swirled groove for swirling fuel in the fuel nozzle.

A fuel supply system including a fuel tank, a feed conduit through which fuel is pumped from the fuel tank, and a normally open return conduit through which excess fuel is returned to the fuel tank, comprising:

• the fuel tank having first and second sumps separated from each other;
• and
• an ejector pump having a pressure chamber opening through a throat into the first sump, the pressure chamber being connected through a communication conduit to the second sump, and a fuel nozzle having an inlet port connected to receive a gravitational free fall of fuel through the return conduit and a discharge end opening into the pressure chamber for discharging a jet of fuel into the pressure chamber to create a negative pressure in the pressure chamber so as to suck fuel through the communication conduit from the second sump, the throat having a length and an inner diameter to provide a length-to-diameter ratio ranging from 2 to 8.