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A supplemental fluid tank, preferably having two chambers each partially containing a fluid, fluid communicated intermediate a fuel tank and vent to reduce fuel vapor emissions, particularly for a boat. More specifically, when fuel is used or cooled, pressure or volume, respectively, of the remaini

A supplemental fluid tank, preferably having two chambers each partially containing a fluid, fluid communicated intermediate a fuel tank and vent to reduce fuel vapor emissions, particularly for a boat. More specifically, when fuel is used or cooled, pressure or volume, respectively, of the remaining fuel in the fuel tank is reduced in prior art systems. Accordingly, air is drawn into the fuel tank through the vent line and becomes saturated with fuel (i.e., fuel vapor). Conversely, when fuel in the fuel tank is warmed it expands and fuel vapor is forced out of the vent into the environment. An exemplary embodiment reduces entry of air in through the vent and escape of fuel vapor out of the vent using two intermediate chambers in fluid communication with each other, each preferably having a non-evaporative fluid (e.g., oil), to provide volume/pressure compensation of the fuel in the fuel tank.

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What is claimed is: 1. A tank pressure compensation system comprising: a chamber having a first end and a second end, said first end connectable to a fluid repository having a first fluid for fluid communication with said first end, said second end in fluid communication with the atmosphere, said c

What is claimed is: 1. A tank pressure compensation system comprising: a chamber having a first end and a second end, said first end connectable to a fluid repository having a first fluid for fluid communication with said first end, said second end in fluid communication with the atmosphere, said chamber receptive to a second fluid contained in a portion of said chamber intermediate said first and second ends disposed above a level of said second fluid, wherein said chamber allows displacement of said second fluid away from said first end toward said second end of said chamber when said first fluid expands while preventing flow of said first fluid into the atmosphere; and a pressure equalizing valve disposed in a vent line in fluid communication with said first and second ends. 2. The system of claim 1, wherein said first fluid includes fuel vapor. 3. The system of claim 1, wherein said second fluid is a barrier fluid having a low vapor pressure. 4. The system of claim 1, wherein said chamber is configured as one of a U, V, and W having opposing elevated ends as said first and second ends of said chamber. 5. The system of claims 1, wherein said chamber includes a first chamber and a second chamber, said first chamber having a first lower portion and a first upper portion, said first upper portion in fluid communication with said first fluid via said first end, said second chamber having a second lower portion and a second upper portion, said second upper portion in fluid communication with the atmosphere via said second end, said second lower portion in fluid communication with said first lower portion of said first chamber. 6. The system of claim 5, wherein said first and second chambers are in fluid communication via a tube extending from said first lower portion to said second lower portion, respectively. 7. The system of claim 5, wherein said first chamber is disposed within said second chamber, said first chamber having an opening in a bottom surface thereof providing fluid communication with a second lower portion of said second chamber. 8. The system of claim 1, wherein said fluid repository is a fuel tank for an internal combustion engine. 9. The system of claim 8, wherein said fuel tank includes a fuel tank for a marine vessel. 10. The system of claim 9, wherein said fuel tank is connectable to said first end via a fuel vent line, said second end is connectable to a vent via a vent line, said vent line and fuel vent line in fluid communication via a pressure relief valve therebetween. 11. The system of claim 10, wherein said fuel tank is adapted to contain at least one of gasoline and diesel fuel. 12. The system of claim 11, further comprising a fuel expansion tank connected in parallel to said fuel vent line having one end connected to said fuel tank and another end connected to said first chamber. 13. A marine vessel fuel tank pressure compensation assembly for use in the hull of a marine vessel that has a fuel system including a fuel tank vented to a vent that communicates with the atmosphere, the system comprising: a first chamber having a first lower portion and a first upper portion, said first upper portion configured for fluid conununication with a first fluid disposed in the fuel tank via a fuel vent line; a second chamber having a second lower portion and a second upper portion, said second upper portion configured for fluid communication with the vent via a vent line, said second lower portion in fluid communication with said first lower portion of said first chamber; a barrier fluid disposed in at least a portion of said first chamber, said barrier fluid configured to allow displacement of said barrier fluid from said first chamber into said chamber when said first fluid expands while preventing flow of said first fluid into the atmosphere; and a pressure equalizing valve, disposed in said vent line, said pressure equalizing valve in fluid communication between said first and second upper portions. 14. The assembly of claim 13, wherein said first and second chambers are in fluid communication via a tube extending from said first lower portion to said second lower portion, respectively. 15. The assembly of claim 13, wherein said first chamber is disposed within said second chamber, said first chamber having an opening in a bottom surface thereof providing fluid communication with a second lower portion of said second chamber. 16. The assembly of claim 13, wherein the fuel tank is adapted to contain at least one of gasoline and diesel fuel. 17. The assembly of claim 16, further comprising a fuel expansion tank connected in parallel to the fuel vent line having one end connectable to the fuel tank and another end connectable to said first chamber. 18. The assembly of claim 13, wherein said first fluid includes fuel vapor. 19. The assembly of claim 13, wherein said barrier fluid is a barrier fluid having a low vapor pressure. 20. A method of reducing fuel vapor emitted from a vent line utilizing a pressure compensation assembly in the hull of a marine vessel that has a fuel system including a fuel tank connected to a vent via the vent line that communicates with the atmosphere, wherein the vent line includes a first vent line fitting and a second vent line fitting both adapted for direct parallel communication with the pressure compensation assembly, the method comprising: attaching the pressure compensation assembly to the marine vessel, wherein the pressure compensation assembly includes; a first chamber having a first lower portion and a first upper portion, said first upper portion configured for fluid communication with a first fluid disposed in the fuel tank via a fuel vent line; a second chamber having a second lower portion and a second upper portion, said second upper portion configured for fluid communication with the vent via a vent line, said second lower portion in fluid communication with said first lower portion of said first chamber; a barrier fluid disposed in at least a portion of said first chamber, said barrier fluid configured to allow displacement of said barrier fluid from said first chamber into said chamber when said first fluid expands while preventing flow of said first fluid into the atmosphere; and a pressure equalizing valve, disposed in said vent line, said pressure equalizing valve in fluid communication between said first and second upper portions.