Fuel supply assembly with in-tank reservoir
A fuel supply assembly includes a reservoir, primary and secondary fuel pumps and a pressure regulator. The secondary fuel pump has first and second inlets, and an outlet. The first inlet receives at least some fuel discharged from a pressure regulator outlet, a nozzle communicated with the first inlet so that a flow of fuel through the nozzle creates a drop in pressure in the area of the second fuel inlet to draw fuel from the supply of fuel through the second inlet and the fuel drawn in through the second fuel inlet is combined with the flow of fuel from the nozzle and the combined fuel flows are discharged from the secondary fuel pump outlet and into the reservoir. The primary fuel pump may be located outside of an interior of the reservoir and the secondary fuel pump may be connected to the reservoir by rigid or flexible conduits.
1. A fuel supply assembly, comprising:
a reservoir having; an interior; an inlet that communicates with the reservoir interior; and a channel having multiple levels that define a spiral flow path that directs fuel outwardly against an inner surface of the reservoir;
a primary fuel pump having an inlet in communication with the reservoir interior and an outlet through which fuel is discharged under pressure;
a pressure regulator having an inlet that receives fuel previously discharged from the primary fuel pump outlet, an outlet through which fuel flows and a pressure regulating valve that controls fuel flow from the pressure regulator inlet to the pressure regulator outlet; and
a secondary fuel pump having a body that defines a first inlet, a second inlet and an outlet, wherein the first inlet receives at least some of the fuel discharged from the pressure regulator outlet, a nozzle communicated with the first inlet so that fuel that flows out of the nozzle flows into the body via the first inlet, the second inlet is in communication with a supply of fuel, and the outlet is in communication with the reservoir interior wherein the flow of fuel through the nozzle creates a drop in pressure in the area of the second fuel inlet to draw fuel from the supply of fuel through the second fuel inlet and the fuel drawn in through the second fuel inlet is combined with the flow of fuel from the nozzle and the combined fuel flows are discharged from the secondary fuel pump outlet and into the reservoir.
2. The assembly of claim 1 which also includes a return fuel line and wherein the return fuel line is coupled to the pressure regulator inlet.
3. The assembly of claim 1 wherein the primary fuel pump is carried by a mount body, a bracket extends between the mount body and the reservoir, and the reservoir is located spaced from the mount body.
4. The assembly of claim 3 wherein the mount body includes a mounting flange adapted to be coupled to an upper wall of a fuel tank, and the reservoir includes a bottom wall adapted to engage a bottom wall of the fuel tank.
5. The assembly of claim 1 wherein the reservoir includes a baffle defining an inlet chamber into which fuel is received from the secondary pump outlet.
6. The assembly of claim 1 wherein the reservoir is constructed so that a lower wall of the reservoir is adapted to be received against a lower wall of a fuel tank, and the lower wall of the reservoir is longer than the height of the reservoir, where height is the dimension extending away from the lower wall of the reservoir.
7. The assembly of claim 1 wherein the reservoir includes a body that defines an inner surface that is tapered, wherein the inner surface has a smaller cross sectional area nearer to a bottom of the reservoir than an upper end of the reservoir.
8. The assembly of one or more of claim 1 wherein an inlet valve is provided in the inlet of the reservoir, and the inlet valve is shaped to direct fuel along an inner surface of the reservoir.
9. The assembly of claim 1 wherein the secondary pump is coupled to a filter and the filter and secondary pump are located remotely from the reservoir.
10. The assembly of claim 1 wherein the primary fuel pump is located outside of the reservoir interior.
11. The assembly of claim 10 wherein the primary pump is not carried by the reservoir.
12. The assembly of claim 9 wherein the secondary fuel pump is coupled to the reservoir by one or more rigid conduits that maintain the secondary fuel pump at a distance from the reservoir that does not vary by more than 70 mm under acceleration up to 3 times gravity.
13. The assembly of claim 9 wherein the secondary fuel pump is coupled to the reservoir by one or more conduits that are flexible to permit the secondary fuel pump to move relative to the reservoir by between 6 inches and 14 inches under acceleration up to 3 times gravity.
14. The assembly of claim 1 wherein the primary fuel pump is carried by a mount body that is adapted to be connected to a fuel tank, a conduit extends between the mount body and the reservoir, and the reservoir is located spaced from the mount body.