Fuel feed apparatus

1. A fuel feed apparatus that supplies fuel in a fuel tank to an outside of the fuel tank, the fuel feed apparatus comprising:

a sub-tank that is received in the fuel tank and has a bottom wall; and

a fuel pump that is received in the sub-tank and pumps fuel in the sub-tank toward the outside of the fuel tank;

wherein:

the bottom wall of the sub-tank has a first passageway extending in the axial direction of the sub-tank, to which a suction jet pump unit to suction fuel in the fuel tank into the sub-tank can be selectively mounted, and

the sub-tank has the bottom wall that has a second passageway extending in the axial direction of the sub-tank, to which a transfer jet pump unit to transfer fuel in the fuel tank into the sub-tank can be selectively mounted, further comprising:

a transfer jet pump unit mounted to the second passageway to suction fuel in the fuel tank into the sub-tank,

wherein:

the transfer jet pump unit includes a second suction port that is positioned at the upstream end and is communicated with the outside of the sub-tank, and a second outlet port that is positioned adjacent to the upper edge of the sub-tank and is opened at the downstream end toward the inside of the sub-tank, and further comprising:

insertion sections which are formed in such a manner that the sidewall of the sub-tank is recessed in the diametrical direction of the sub-tank so that shafts connected with a flange to cover an opening on the upper wall of the fuel tank are slidably inserted thereinto, and

a step section which are formed in such a manner that the sidewall of the sub-tank is partially recessed in the diametrical direction of the sub-tank so that a sender gauge to measure the level of fuel in a fuel tank is provided in,

wherein:

the suction jet pump unit and the transfer jet pump are received within a space between the step section and a said insertion section of the sub-tank.

2. The fuel feed apparatus according to claim 1 , wherein:

the sub-tank has the bottom wall that is partially recessed in the axial direction of the sub-tank, so as to form a second step section that forms a second gap between the bottom wall of the sub-tank and the bottom wall of the fuel tank; and

the second passageway is formed in the second step section to open to said second gap.

3. The fuel feed apparatus according to claim 1 , further comprising:

a transfer jet pump unit mounted to the second passageway to suction fuel in the fuel tank into the sub-tank,

wherein:

the transfer jet pump unit includes a second throat pipe communicated with the inside of the sub-tank, a second suction port to connect the second throat pipe and the outside of the sub-tank, and a second jet nozzle that jets fuel toward the second throat pipe, so as to generate suction power by which fuel in the fuel tank is suctioned from the second suction port through the second throat pipe.

4. The fuel feed apparatus according to claim 3 , further comprising:

an second extended pipe that is joined with the second throat pipe at the downstream end of the second throat pipe and extends the length of a passageway within the transfer jet pump unit in the axial direction of the sub-tank.

5. The fuel feed apparatus according to claim 1 , wherein:

the first passageway is formed at a lower position in the bottom of the sub-tank than the second passageway is formed.

6. The fuel feed apparatus according to claim 1 , wherein:

the first passageway has a structure to which the transfer jet pump unit can be selectively mounted instead of the suction jet pump unit.

7. The fuel feed apparatus according to claim 6 , wherein:

the second passageway has a structure to which the suction jet pump unit can be selectively mounted instead of the transfer jet pump unit.

8. A fuel feed apparatus that supplies fuel in a fuel tank to an outside of the fuel tank, the fuel feed apparatus comprising:

a sub-tank that is received in the fuel tank and has a bottom wall;

a fuel pump that is received in the sub-tank and pumps fuel in the sub-tank toward the outside of the fuel tank;

wherein:

the bottom wall of the sub-tank has a first passageway extending in the axial direction of the sub-tank, to which a suction jet pump unit to suction fuel in the fuel tank into the sub-tank can be selectively mounted, and

a suction jet pump unit mounted to the first passageway to suction fuel in the fuel tank into the sub-tank,

wherein:

the suction jet pump unit includes a first suction port that is positioned at the upstream end and is communicated with the outside of the sub-tank, a first outlet port that is positioned adjacent to the upper edge of the sub-tank and is opened at the downstream end toward the inside of the sub-tank, and a first joint member that is provided at the downstream end that has a engaging member which can engage so as to clip onto the upper edge of a sidewall of the sub-tank.

9. The fuel feed apparatus according to claim 8 , further comprising:

a first curved section that changes fuel flowing within the suction jet pump unit in the axial direction of the suction jet pump unit into fuel flowing toward the inside of the sub-tank in a direction perpendicular to the axis of the suction jet pump unit.

10. The fuel feed apparatus according to claim 8 , further comprising:

a first curved section that changes fuel flowing within the suction jet pump unit in the axial direction of the suction jet pump unit into fuel flowing toward the bottom of the sub-tank.

11. The fuel feed apparatus according to claim 9 , wherein:

the first curved section has a smoothly-curved inner surface which has a curvature radius R.

12. The fuel feed apparatus according to claim 10 , wherein:

the first curved section has a smoothly-curved inner surface which has a curvature radius R.

13. A fuel feed apparatus that supplies fuel in a fuel tank to an outside of the fuel tank, the fuel feed apparatus comprising:

a sub-tank that is received in the fuel tank and has a bottom wall; and

a fuel pump that is received in the sub-tank and pumps fuel in the sub-tank toward the outside of the fuel tank;

wherein:

the bottom wall of the sub-tank has a first passageway extending in the axial direction of the sub-tank, to which a suction jet pump unit to suction fuel in the fuel tank into the sub-tank can be selectively mounted, and

the sub-tank has the bottom wall that has a second passageway extending in the axial direction of the sub-tank, to which a transfer jet pump unit to transfer fuel in the fuel tank into the sub-tank can be selectively mounted, further comprising:

a transfer jet pump unit mounted to the second passageway to suction fuel in the fuel tank into the sub-tank,

wherein:

the transfer jet pump unit includes a second suction port that is positioned at the upstream end and is communicated with the outside of the sub-tank, and a second outlet port that is positioned adjacent to the upper edge of the sub-tank and is opened at the downstream end toward the inside of the sub-tank, and

the transfer jet pump unit has a second joint member that is provided at the downstream end and has a engaging member which can engage in such a way as to clip onto the upper edge of a sidewall of the sub-tank.

14. The fuel feed apparatus according to claim 13 , further comprising:

a second curved section that changes fuel flowing within the transfer jet pump unit in the axial direction of the transfer jet pump unit into fuel flowing toward the inside of the sub-tank in a direction perpendicular to the axis of the transfer jet pump unit.

15. The fuel feed apparatus according to claim 13 , further comprising:

a second curved section that changes fuel flowing within the transfer jet pump unit in the axial direction of the suction jet pump unit into fuel flowing toward the bottom of the sub-tank.

16. The fuel feed apparatus according to claim 14 , wherein:

the second curved section has a smoothly-curved inner surface which has a curvature radius R.

17. The fuel feed apparatus according to claim 15 , wherein:

the second curved section has a smoothly-curved inner surface which has a curvature radius R.