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An assembly for holding a fluid includes an auxiliary reservoir inside a main reservoir. The auxiliary reservoir includes an auxiliary reservoir shell with a fill passage at or near its bottom. The auxiliary reservoir shell also has a vent passage at or near its top. The fill passage and the vent pa

An assembly for holding a fluid includes an auxiliary reservoir inside a main reservoir. The auxiliary reservoir includes an auxiliary reservoir shell with a fill passage at or near its bottom. The auxiliary reservoir shell also has a vent passage at or near its top. The fill passage and the vent passage fluidically connect the auxiliary reservoir to the main reservoir. A fluid inlet is located inside the main reservoir and outside of the auxiliary reservoir. A fluid outlet located inside the auxiliary reservoir between the fill passage and the vent passage.

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1. An assembly comprising: a main reservoir for holding a fluid;an auxiliary reservoir located inside the main reservoir, the auxiliary reservoir comprising: an auxiliary reservoir shell comprising a shell top and a shell bottom;at least one fill passage through the auxiliary reservoir shell at or n

1. An assembly comprising: a main reservoir for holding a fluid;an auxiliary reservoir located inside the main reservoir, the auxiliary reservoir comprising: an auxiliary reservoir shell comprising a shell top and a shell bottom;at least one fill passage through the auxiliary reservoir shell at or near the shell bottom; andat least one vent passage through the auxiliary reservoir shell at or near the shell top, wherein the auxiliary reservoir is fluidically connected to the main reservoir by the fill passage and the vent passage;a fluid inlet located inside the main reservoir and outside of the auxiliary reservoir;a fluid outlet located inside the auxiliary reservoir between the fill passage and the vent passage;a first supply passage in fluid communication with the fluid outlet;a first pump operably connected to the first supply passage for pumping the fluid from the auxiliary reservoir to a first engine component;a second supply passage connected to the main reservoir;a second pump operably connected to the second supply passage for pumping the fluid from the main reservoir to a second engine component; anda backup connection passage fluidically connected to the first supply passage at a first interface between the first pump and the first engine component to the second supply passage at a second interface between the second pump and the second engine component. 2. The assembly of claim 1, wherein the vent passage has a smaller flow area than the fill passage. 3. The assembly of claim 1, wherein the fill passage is configured to allow fluid flow from the main reservoir to the auxiliary reservoir under normal operating conditions. 4. The assembly of claim 1, wherein the vent passage is configured to allow air flow from the auxiliary reservoir to the main reservoir under normal operating conditions. 5. The assembly of claim 1, wherein the first engine component comprises a fan drive gear system for a gas turbine engine. 6. The assembly of claim 1, wherein the auxiliary reservoir shell is rigid and tapers from the shell bottom to the shell top. 7. The assembly of claim 1, wherein the fluid outlet is vertically positioned between the fill passage and the vent passage. 8. An assembly comprising: a main reservoir for holding a fluid;an auxiliary reservoir located inside the main reservoir, the auxiliary reservoir comprising: an auxiliary reservoir shell comprising a shell top and a shell bottom;a fill passage through the auxiliary reservoir shell at or near the shell bottom; anda vent passage through the auxiliary reservoir shell at or near the shell top, wherein the auxiliary reservoir is fluidically connected to the main reservoir by the fill passage and the vent passage;a fluid inlet located inside the main reservoir and outside of the auxiliary reservoir; anda valve configured to allow fluid flow through the vent passage in a first valve position and to reduce fluid flow through the vent passage in a second valve position, wherein the valve is in the first valve position under normal operating conditions and in the second valve position under negative gravity conditions. 9. An assembly comprising: a main reservoir for holding a fluid;an auxiliary reservoir located inside the main reservoir, the auxiliary reservoir comprising: an auxiliary reservoir shell comprising a shell top and a shell bottom;a fill passage through the auxiliary reservoir shell at or near the shell bottom; anda vent passage through the auxiliary reservoir shell at or near the shell top, wherein the auxiliary reservoir is fluidically connected to the main reservoir by the fill passage and the vent passage;a fluid inlet located inside the main reservoir and outside of the auxiliary reservoir;a valve configured to allow fluid flow through the vent passage in a first valve position and to reduce fluid flow through the vent passage in a second valve position; anda deaerator comprising a deaerator vent passage for allowing air flow between the deaerator and the main reservoir, and wherein the valve is further configured to allow fluid flow through the deaerator vent passage in a first valve position and to reduce fluid flow through the deaerator vent passage in a second valve position. 10. An assembly comprising: a main reservoir for holding a fluid;an auxiliary reservoir located inside the main reservoir, the auxiliary reservoir comprising: an auxiliary reservoir shell comprising a shell top and a shell bottom;a fill passage through the auxiliary reservoir shell at or near the shell bottom; anda vent passage through the auxiliary reservoir shell at or near the shell top, wherein the auxiliary reservoir is fluidically connected to the main reservoir by the fill passage and the vent passage;a valve configured to allow fluid flow through the vent passage in a first valve position and to reduce fluid flow through the vent passage in a second valve position; anda fluid inlet located inside the main reservoir and outside of the auxiliary reservoir; anda fluid outlet located inside the auxiliary reservoir between the fill passage and the vent passage. 11. The assembly of claim 10, and further comprising: a first supply passage in fluid communication with the fluid outlet; anda first pump operably connected to the first supply passage for pumping the fluid from the auxiliary reservoir to a first engine component. 12. The assembly of claim 11, and further comprising: a second supply passage connected to the main reservoir; anda second pump operably connected to the second supply passage for pumping the fluid from the main reservoir to a second engine component. 13. The assembly of claim 12, and further comprising: a backup connection passage fluidically connected to the first supply passage at a first interface between the first pump and the first engine component to the second supply passage at a second interface between the second pump and the second engine component. 14. The assembly of claim 12, wherein the first engine component comprises a fan drive gear system for a gas turbine engine, wherein the fan drive gear system operably connects a fan to a low pressure spool. 15. The assembly of claim 10, wherein the auxiliary reservoir shell is rigid and tapers from the shell bottom to the shell top. 16. The assembly of claim 10, wherein the valve is in the first valve position under normal operating conditions and in the second valve position under negative gravity conditions. 17. The assembly of claim 10, and further comprising: a deaerator comprising a deaerator vent passage for allowing air flow between the deaerator and the main reservoir, and wherein the valve is further configured to allow fluid flow through the deaerator vent passage in a first valve position and to reduce fluid flow through the deaerator vent passage in a second valve position. 18. The assembly of claim 10, wherein the fluid outlet is vertically positioned between the fill passage and the vent passage. 19. An assembly comprising: a main reservoir for holding a fluid; andan auxiliary reservoir attached to the main reservoir, the auxiliary reservoir comprising: an auxiliary reservoir shell comprising a shared wall between the auxiliary reservoir and the main reservoir; anda valve comprising: a vent passage through the shared wall;a disc having a width and a height wherein the width is greater than the height; anda stem attached to the disc, wherein the stem is configured to slide the disc from a first valve position wherein the disc is spaced apart from the shared wall so as to allow fluid flow through the vent passage to a second valve position wherein the disc is adjacent to the shared wall so as to reduce fluid flow through the vent passage. 20. The assembly of claim 19, wherein the disc comprises: a first surface attached to the stem and concave in a direction towards the stem;a second surface convex in shape, opposite the first surface, and nearer to the vent passage than the first surface; anda disc edge connecting a perimeter of the first surface to a perimeter of the second surface, wherein the disc edge contacts the shared wall when the disc is in the second valve position. 21. The assembly of claim 19, wherein the stem comprises a perforated cylinder.