Fuel filter arrangement
View Patent ↗A fuel filter and vapor separator arrangement having at least one layer of liquid fuel permeable material defining at least one substantially enclosed cavity. The permeable material has at least one opening to provide fluid communication of liquid fuel within the cavity with an inlet of a high pressure fuel pump outside the cavity. A jet pump and/or fuel vapor vent is arranged relative to the cavity to facilitate the elimination of fuel vapor flowing to the high pressure fuel pump.
1. A fuel filter arrangement for use in a fuel tank of a vehicle, comprising:
an outer layer of permeable material defining a substantially enclosed cavity with at least one opening passing through the outer layer;
a tubular connector extending through one of the openings and having an inlet located in the cavity and an outlet located outside the cavity; and
a jet nozzle generally adjacent the cavity having an inlet for receiving fuel under pressure and an outlet for dispensing fuel, the dispensed fuel inhibiting fuel vapor from entering the inlet of the tubular connector.
2. The fuel filter arrangement of claim 1 further comprising a venturi in axial alignment with the jet nozzle downstream from the jet nozzle.
3. The fuel filter arrangement of claim 2 wherein the venturi is in fluid communication with the cavity.
4. The fuel filter arrangement of claim 3 wherein the venturi is attached to the outer layer.
5. The fuel filter arrangement of claim 4 wherein the venturi has an outlet outside the cavity.
6. The fuel filter arrangement of claim 2 wherein the outer layer has a lower wall with an opening for receiving the venturi in axial alignment with the jet nozzle.
7. The fuel filter arrangement of claim 6 wherein the venturi is attached in the opening in the lower wall.
8. The fuel filter arrangement of claim 2 wherein the venturi is generally L-shaped with the venturi having a longitudinal axis and having an inlet extending generally laterally from said longitudinal axis and in fluid communication with the jet nozzle.
9. The fuel filter arrangement of claim 8 wherein the inlet abuts the outer layer.
10. The fuel filter arrangement of claim 8 further comprising a tubular connector attached in an opening in the outer layer and wherein the venturi has a free end arranged for a loose fit connection within the connector.
11. The fuel filter arrangement of claim 8 further comprising a tubular extension extending from the venturi to a free end arranged for operable connection with an outlet of the high pressure fuel pump.
12. The fuel filter arrangement of claim 11 wherein the jet nozzle is received in the tubular extension upstream from the venturi.
13. The fuel filter arrangement of claim 11 wherein the tubular extension passes through outer layer of material.
14. The fuel filter arrangement of claim 8 further comprising a substantially impermeable layer of material at least in part encapsulating the venturi.
15. The fuel filter arrangement of claim 8 wherein the venturi is outside the cavity defined by the outer layer of material.
16. The fuel filter arrangement of claim 15 further comprising a tubular connector attached to the outer layer of material, the connector having an inner diameter, the venturi having an outer diameter less than the inner diameter of the connector and being received in the inner diameter of the connector to establish a loose fit connection between the venturi and the connector.
17. The fuel filter arrangement of claim 2 further comprising an inner layer of permeable material defining another substantially enclosed cavity in the cavity defined by the outer layer of material, the venturi being received in the cavity defined by the inner layer of material.
18. The fuel filter arrangement of claim 17 wherein the inlet terminates in a free end abutting the inner layer of material.
19. The fuel filter arrangement of claim 17 further comprising a substantially impermeable layer of material defining a pocket having a closed end within the cavity defined by the inner layer of material, the venturi being received at least in part in the pocket.
20. The fuel filter arrangement of claim 19 wherein the venturi has an outlet facing generally toward the closed end of the pocket.
21. The fuel filter arrangement of claim 2 further comprising a tubular connector attached to an opening in the outer layer, the connector having an inner diameter, the venturi having an outer diameter less than the inner diameter of the connector and being received in the inner diameter of the connector to establish a loose fit connection between the venturi and the connector.
22. The fuel filter arrangement of claim 21 further comprising another tubular connector attached to another opening in the outer layer of material.
23. The fuel filter arrangement of claim 1 wherein the jet nozzle is carried in the cavity.
24. The fuel filter arrangement of claim 1 wherein the outer layer has an upper wall and a lower wall with at least one of the openings passing through the upper wall and receiving the tubular connector.
25. The fuel filter arrangement of claim 1 further comprising an inner layer of permeable material defining another substantially enclosed cavity separate from the cavity defined by the outer layer of material.
26. The fuel filter arrangement of claim 25 further comprising a vent received in the outer layer of material allowing fuel vapor to flow outwardly from said another cavity.
27. The fuel filter arrangement of claim 25 wherein the inner layer is spaced from the outer layer and fully encapsulated by the outer layer of material.
28. The fuel filter arrangement of claim 25 wherein the inner layer has an outer perimeter, the inner layer being attached to the outer layer generally adjacent the outer perimeter.
29. The fuel filter arrangement of claim 25 wherein the jet nozzle is carried in said another substantially enclosed cavity.
30. The fuel filter arrangement of claim 25 wherein the inner layer is biased away from the outer layer by a spring.
31. The fuel filter arrangement of claim 25 wherein the inner layer and outer layer are constructed from a woven material, the outer layer having one average porosity and the inner layer having another average porosity that is greater than the average porosity of the outer layer.
32. The fuel filter arrangement of claim 25 further comprising a substantially impermeable layer of material spaced from the inner layer and defining a pocket in the cavity defined by the inner layer.
33. The fuel filter arrangement of claim 32 further comprising a venturi in axial alignment with the jet nozzle downstream from the jet nozzle.
34. The fuel filter arrangement of claim 33 wherein the venturi is received at least partially in the pocket.
35. A fuel filter for use inside a fuel tank, comprising:
an outer layer of permeable material defining a substantially enclosed outer cavity and having a pair of openings through the outer layer; and
an inner layer of permeable material defining a substantially enclosed inner cavity, the inner cavity being substantially enclosed by the outer cavity with one of the openings extending into the inner cavity.
36. The fuel filter of claim 35 further comprising a tubular connector extending through the one opening into the inner layer and having an inlet in fluid communication with the inner cavity.
37. The fuel filter of claim 36 wherein the tubular connector presents a continuous impermeable barrier to fuel within the outer cavity.
38. The fuel filter of claim 35 further comprising a vent received in an opening in the outer layer, the vent allowing fuel vapor within the outer cavity to flow out of the outer cavity while preventing liquid fuel from entering the outer cavity through the vent.
39. The fuel filter of claim 38 wherein the vent comprises a jet nozzle having an inlet for receiving fuel under pressure and an outlet for discharging fuel under pressure.
40. The fuel filter of claim 39 further comprising a venturi having an inlet receiving the fuel at least in part discharged from the outlet of the jet nozzle and fuel vapor from the outer cavity.
41. The fuel filter of claim 35 wherein the inner layer is constructed as a woven material having a porosity sized to allow liquid fuel to flow from the outer cavity into the inner cavity and sized to inhibit vapor bubbles from flowing into the inner cavity.
42. The fuel filter of claim 35 wherein the outer layer is constructed as a woven material having one porosity and the inner layer is constructed as a woven material having another porosity, said one porosity being less than said another porosity.
43. The fuel filter of claim 35 further comprising a connector and a filter material within the connector.
44. The fuel filter of claim 35 wherein at least a portion of the inner layer is located substantially at a lowermost point of the outer layer.