Vapor separator
View Patent ↗A vapor separator includes a fuel pump, and a container at least partially defining a fuel reservoir to hold fuel and a pump chamber to hold the fuel pump. A closure is carried by the container to close the fuel reservoir and at least partially defines a vapor chamber above a level of fuel in the fuel reservoir and in fluid communication with the pump chamber. A vapor vent device is carried by the closure to allow fuel vapor to vent out of the vapor separator from the vapor chamber and prevent liquid fuel from flowing therethrough when the vapor separator is declined.
1. A fuel vapor separator for an engine with a crankcase, comprising:
an electric fuel pump;
a container at least partially defining a fuel reservoir to hold fuel and a pump chamber to hold the fuel pump;
a closure carried by the container to close the fuel reservoir and at least partially defining a vapor chamber above a level of fuel in the fuel reservoir and in fluid communication with the pump chamber; and
a vapor vent valve carried by the closure and having a diaphragm communicating with the crankcase of the engine to open continuously the vent valve to allow fuel vapor to vent from the vapor chamber during engine operation and is otherwise closed to prevent liquid fuel from flowing therethrough out of the vapor separator.
2. The vapor separator of claim 1 , wherein the closure includes a valve boss and a vapor vent housing, and wherein the vent valve includes:
a vent cover carried by the vapor vent housing and configured for fluid communication with an engine crankcase,
the diaphragm is carried between the vapor vent housing and the vent cover,
a spring disposed between the vent cover and the diaphragm to urge the diaphragm toward the valve boss, and
a valve body disposed in the valve boss in fluid communication with the vapor chamber and carried by the diaphragm.
3. The vapor separator of claim 2 , further comprising a splash screen, wherein the closure includes a pocket in fluid communication between the vapor chamber and the vent valve, wherein the splash screen is carried in the pocket.
4. The vapor separator of claim 1 , further comprising an external fuel pump carried by the container to pressurize fuel for delivery into the vapor separator.
5. The vapor separator of claim 4 , wherein the external fuel pump is a diaphragm fuel pump operated by pressure pulses from the engine crankcase.
6. The vapor separator of claim 1 , further comprising a fuel filter carried by the container.
7. The vapor separator of claim 1 , further comprising a pressure relief valve carried by the closure.
8. The vapor separator of claim 7 , wherein the pressure relief valve includes a valve seat carried by the closure and a spring biased valve carried in the valve seat.
9. The vapor separator of claim 1 , further comprising injector return passages and a common injector return conduit in fluid communication with the return passages and the fuel reservoir, and further including injector supply passages and a common injector supply conduit in fluid communication with the supply passages and the outlet of the fuel pump.
10. The vapor separator of claim 9 , wherein the container includes injector mounting bosses carrying the return and supply passages.
11. The vapor separator of claim 10 , wherein the injector mounting bosses also carry mounting passages therethrough.
12. The vapor separator of claim 9 , further comprising a fuel pressure regulator carried in the injector return conduit.
13. The vapor separator of claim 12 , further comprising a closure carried by the container to close the container and at least partially defining a vapor chamber above the level of fuel, wherein the closure includes a pocket to receive a portion of the fuel pressure regulator, and wherein the fuel pressure regulator is located downstream of the injector return passages and between the container and the closure.
14. The vapor separator of claim 12 , further comprising a fuel filter carried in the injector conduit upstream of the fuel pressure regulator.
15. The vapor separator of claim 9 , further comprising a fuel filter carried in the injector return conduit.
16. The vapor separator of claim 9 , further comprising seals carried in the injector return and supply passages.
17. The vapor separator of claim 1 , further comprising a fuel pressure regulator carried by the container.
18. The vapor separator of claim 17 , wherein the fuel pressure regulator includes a valve and the closure includes a pocket configured to accept and guide a portion of the valve.
19. The vapor separator of claim 17 , further comprising a fuel filter carried by the container and disposed upstream of the fuel pressure regulator.
20. The vapor separator of claim 17 , further comprising a fuel filter extending transversely across at least a portion of the fuel reservoir.
21. The vapor separator of claim 1 , further comprising a non-coiled heat exchanger tube extending through the fuel reservoir.
22. The vapor separator of claim 21 , wherein the tube is carried by the container and the closure.
23. The vapor separator of claim 22 , wherein ends of the tube are disposed in pockets of the container and the closure.
24. The vapor separator of claim 22 , further comprising seals disposed between ends of the tube and the container and closure.
25. A vapor separator, comprising:
a fuel pump;
at least one electric wire connected to the fuel pump;
a container assembly including a container at least partially defining a pump chamber in which the fuel pump is disposed and a fuel reservoir to hold liquid fuel;
a closure carried by the container to close the fuel reservoir and at least partially defining a vapor chamber above the level of liquid fuel; and
a wire grommet carried by the container assembly above the level of liquid fuel, receiving the electric wire therethrough, and including at least one vapor passage therethrough to convey fuel vapor from the pump chamber to the vapor chamber.
26. The vapor separator of claim 25 , wherein the container assembly includes a pump cover carried by the container and partially defining the pump chamber, wherein the wire grommet is carried in an open upper end of the pump cover.
27. The vapor separator of claim 25 , wherein the container includes a pump tower in fluid communication with the pump chamber and including an open upper end carrying the wire grommet therein.
28. The vapor separator of claim 25 , for an engine with a crankcase and further comprising a vapor vent valve carried by the closure and having a diaphragm communicating with the crankcase of the engine to open the vent valve to allow fuel vapor to vent from the vapor chamber during engine operation and is otherwise closed to prevent liquid fuel and fuel vapor from flowing therethrough.
29. A vapor separator, comprising:
a fuel pump including an inlet end, and an inlet fuel port and a vapor purge port at the inlet end;
a container at least partially defining a pump chamber in which the fuel pump is disposed and a fuel reservoir to hold fuel; and
a seal carried by the inlet end of the fuel pump and including:
an outer surface to engage a portion of the container,
a recess to engage the inlet end of the fuel pump,
a divider including a projection in contact with the inlet end of the fuel pump to sealingly separate the inlet fuel port from the vapor purge port,
an inlet aperture in fluid communication with the inlet port,
a vapor purge pocket in fluid communication with the vapor purge port, and
a vapor purge aperture in fluid communication between the vapor purge pocket and the pump chamber.
30. The vapor separator of claim 29 , further comprising a fuel filter carried by the seal.
31. The vapor separator of claim 30 , wherein the seal further includes a second recess in which the fuel filter is carried.
32. The vapor separator of claim 29 , wherein the container includes an internal wall and a bottom, wherein a fluid passage is defined between a portion of the internal wall and the bottom in fluid communication between the fuel reservoir and the pump chamber.
33. The vapor separator of claim 32 , wherein the inlet aperture of the seal is in fluid communication with the fluid passage to receive fuel from the fuel reservoir.
34. The vapor separator of claim 32 , further comprising a pump cover carried by the container atop the internal wall and including a fuel outlet conduit therethrough, wherein the fuel pump includes an outlet in fluid communication with the fuel outlet conduit of the pump cover.
35. The vapor separator of claim 29 , for an engine with a crankcase and further comprising a closure carried by the container to close the fuel reservoir and at least partially defining a vapor chamber above a level of liquid fuel in the fuel reservoir and in fluid communication with the pump chamber; and a vapor vent valve carried by the closure and having a diaphragm communicating with the crankcase of the engine to open the vent valve to allow fuel vapor to vent from the vapor chamber during engine operation and is otherwise closed to prevent liquid fuel and fuel vapor from flowing therethrough.