Crankcase drainings recycling system

Claim 2

A fuel supply system for a two-stroke engine including a crankcase and a fuel feeding means, said fuel supply system including a fuel tank connected to said fuel feeding means, and means for preventing escape of fuel vapor from said fuel tank when the engine is not operating and for venting of excessive vapor pressure in said fuel tank when the engine is operating, said means for preventing escape of fuel vapor and for venting excess vapor pressure including a vented drainage tank, a drains conduit communicating between said crankcase and said drainage tank, first conduit and valve means extending between said drainage tank and said fuel tank for providing controlled drainage flow and second conduit and valve means extending between said drainage tank and said fuel tank for providing controlled vapor flow between said drainage tank and said fuel tank.

Claim 3

A fuel supply system in accordance with claim 1 wherein said means for preventing escape of fuel vapor and for venting excess vapor pressure also functions to conduct drains from said crankcase to said fuel tank.

Claim 4

A fuel supply system in accordance with claim 1 wherein said drain conduit includes a one-way valve affording flow from the crankcase to said drainage tank and preventing flow from from said drainage tank to the crankcase.

Claim 5

A fuel supply system in accordance with claim 1 and further including a vent line communicaTing between said drainage tank and the fuel feeding means.

Claim 6

A fuel supply system in accordance with claim 1 wherein the fuel feeding means includes a carburetor and a fuel inlet manifold connecting the carburetor to the engine and further including a vent line communicating between the upper portion of said drainage tank and the intake manifold.

Claim 7

A fuel supply system in accordance with claim 1 wherein said first conduit and valve means includes a drain line communicating between said drainage tank and said fuel tank and including a check valve affording flow from said drainage tank to said fuel tank and preventing flow from said fuel tank to said drainage tank, and wherein said second conduit and valve means includes a vent line between said fuel tank and the upper portion of said drainage tank and including a valve and a valve operating member connected to said valve to move said valve to an open position in response to engine operation.

Claim 8

A fuel supply system in accordance with claim 6 wherein said valve operating member comprises a float in said drainage tank operable upon the accumulation of a predetermined amount of drains to cause opening of said valve.

Claim 9

A fuel supply system for a two-stroke engine including a crankcase having a portion adapted for collecting drains and a fuel feeding means, said system comprising a fuel tank including a filler cap having means for sealing the interior of said fuel tank from the atmosphere, a fuel line connecting said fuel tank and the fuel feeding means, a vented drainage tank, a conduit connecting said drainage tank to the drains-collecting crankcase portion and including means preventing flow from said drainage tank to the crankcase, and first valve and conduit means communicating between said drainage tank and said fuel tank for venting vapor pressure in said fuel tank when a predetermined amount of drains accumulate in said drainage tank and the pressure generated by drains accumulation in said drainage tank is less than the vapor pressure in said fuel tank, and second conduit and valve means communicating between said drainage tank and said fuel tank for discharging drains from said drainage tank to said fuel tank when the vapor pressure in said fuel tank is less than the pressure generated by drains accumulation in said drainage tank.

Claim 10

A fuel supply system for a two-stroke engine including a crankcase having a portion adapted for collecting drains and a fuel feeding means, said system comprising a fuel tank including a filler cap having means for sealing the interior of said fuel tank from the atmosphere, a fuel line connecting said fuel tank and the fuel feeding means, a vented drainage tank, a conduit connecting said drainage tank to the drains-collecting crankcase portion and including means preventing flow from said drainage tank to the crankcase, and first valve and conduit means communicating between said drainage tank and said fuel tank for venting vapor pressure in said fuel tank when a predetermined amount of drains accumulate in said drainage tank and the pressure generated by drains accumulation in said drainage tank is less than the vapor pressure in said fuel tank, and second conduit and valve means communicating between said drainage tank and said fuel tank for discharging drains from said drainage tank to said fuel tank when the vapor pressure in said fuel tank is less than the pressure generated by drains accumulation in said drainage tank.

Claim 11

A fuel supply system in accordance with claim 8 wherein said first valve and conduit means comprises a drain line communicating between said drainage tank and said fuel tank and including a check valve affording flow from said drainage tank to said fuel tank and preventing flow from said fuel tank to said drainage tank and wherein said second valve and conduit means comprises a vent line between said fuel tank and the upper portion of said drainage tank and including a valve and a valve operating member connected to said valve to move said valve to an open position only in response to engine operation and the presence of excessive vapor pressure in said fuel tank.

Claim 12

A fuel supply system in accordance with claim 9 wherein said valve operating member comprises a float in said drainage tank operable upon the accumulation of a predetermined amount of drains to cause opening of said valve.

Claim 13

A fuel supply system comprising a two-stroke engine including a crankcase having a portion adapted for collecting drains and an engine fuel feeding means including a carburetor and an air inlet manifold connecting said carburetor to said engine, a fuel tank including an upper portion, a lower portion, and a filler cap having means for sealing the interior of the fuel tank from the atmosphere, a fuel line connecting said fuel tank lower portion and said carburetor, a drainage tank including an upper portion, a lower portion, and a float mounted on said drainage tank for movement between a raised position and a lowered position in accordance with the quantity of drains in said drainage tank, a conduit connecting said drainage tank to said crankcase portion and including means preventing flow from said drainage tank to said crankcase, a vent line connecting said drainage tank upper portion to said intake manifold, a drain line connecting said drainage tank lower portion and fuel tank upper portion and including a check valve affording flow from said drainage tank to said fuel tank and preventing flow from said fuel tank to said drainage tank, and a duct connecting said fuel tank upper portion and said drainage tank upper portion and including valve means connected to said float and operable when said float is in said raised position to open said valve and to close said valve when said float is lowered from said raised position toward said lowered position.

Claim 14

A fuel supply system comprising a two-stroke engine including a crankcase having a portion adapted for collecting drains and an engine fuel feeding means including a carburetor and an air inlet manifold connecting said carburetor to said engine, a fuel tank including an upper portion, a lower portion, and a filler cap having means for sealing the interior of the fuel tank from the atmosphere, a fuel line connecting said fuel tank lower portion and said carburetor, a drainage tank including an upper portion, a lower portion, and a float mounted on said drainage tank for movement between a raised position and a lowered position in accordance with the quantity of drains in said drainage tank, a conduit connecting said drainage tank to said crankcase portion and including means preventing flow from said drainage tank to said crankcase, a vent line connecting said drainage tank upper portion to said intake manifold, a drain line connecting said drainage tank lower portion and fuel tank upper portion and including a check valve affording flow from said drainage tank to said fuel tank and preventing flow from said fuel tank to said drainage tank, and a duct connecting said fuel tank upper portion and said drainage tank upper portion and including valve means connected to said float and operable when said float is in said raised position to open said valve and to close said valve when said float is lowered from said raised position toward said lowered position.

Claim 15

A fuel supply system for a two-stroke engine including a crankcase and a fuel feeding means, said fuel supply system including a fuel tank connected to said fuel feeding means, and means for preventing escape of fuel vapor from said fuel tank when the engine is not operating and for venting of excessive vapor pressure in said fuel tank when the engine is operating, said means for preventing escape of fuel vapor and for venting excess vapor pressure including a vented drainage tank, a drain conduit communicating between said crankcase and said drainage tank, first conduit means extending between said drainage tank and said fuel tank and including a one way valve affording flow from said drainage tank to said fuel tank and preventing flow from said fuel tank to said drainage tank, and second conduit means extending between said drainage tank and said fuel tank and including normally closed valve means operable to open in response to accumulation of drains in said drainage tank.

Claim 16

A fuel supply system for a two-stroke engine including a crankcase and a fuel feeding means, said fuel supply system including a fuel tank connected to said fuel feeding means, and means for preventing escape of fuel vapor from said fuel tank when the engine is not operating and for venting of excessive vapor pressure in said fuel tank when the engine is operating, said means for preventing escape of fuel vapor and for venting excess vapor pressure including a vented drainage tank, a drain conduit communicating between said crankcase and said drainage tank, first conduit means extending between said drainage tank and said fuel tank and including a one way valve affording flow from said drainage tank to said fuel tank and preventing flow from said fuel tank to said drainage tank, and second conduit means extending between said drainage tank and said fuel tank and including normally closed valve means operable to open in response to accumulation of drains in said drainage tank.

Claim 17

A fuel supply system including a crankcase and a fuel feeding means, said fuel supply system including a fuel tank connected to said fuel feeding means, a vented drainage tank, a drain conduit between said crankcase and said drainage tank, a drain line communicating between said drainage tank and said fuel tank and including a check valve affording flow from said drainage tank to said fuel tank and preventing flow from said fuel tank to said drainage tank, and a vent line between said fuel tank and the upper portion of said drainage tank and including a valve and a valve operating member connected to said valve, and operable upon the accumulation of a predetermined amount of drains in said drainage tank to cause opening of said valve.

Claim 18

A fuel supply system including a crankcase and a fuel feeding means, said fuel supply system including a fuel tank connected to said fuel feeding means, a vented drainage tank, a drain conduit between said crankcase and said drainage tank, a drain line communicating between said drainage tank and said fuel tank and including a check valve affording flow from said drainage tank to said fuel tank and preventing flow from said fuel tank to said drainage tank, and a vent line between said fuel tank and the upper portion of said drainage tank and including a valve and a valve operating member connected to said valve, and operable upon the accumulation of a predetermined amount of drains in said drainage tank to cause opening of said valve.

Claim 19

A fuel supply system in accordance with claim 13 wherein said valve operating member comprises a float in said drainage tank.