Dual valve tank venting system

A tank venting system comprising

• a tank formed to include an interior region, the tank including a top wall overlying a first portion of the interior region and a bottom wall underlying the top wall and defining a floor of the interior region,
• a vapor dome positioned to rise vertically above the top wall of the tank, the vapor dome being formed to include a vapor-receiving space overlying a second portion of the interior region of the tank adjacent to the first portion and communicating with the interior region of the tank to receive fuel vapor generated by liquid fuel contained in the interior region of the tank, the vapor dome including a raised top wall defining a ceiling of the vapor-receiving space and lying at a first elevation vertically above the top wall of the tank so that the top wall of the tank lies at a second elevation vertically above the bottom wall of the tank and vertically below the elevation of the raised top wall of the vapor dome, the vapor dome further including an inclined sidewall interconnecting the top wall of the tank and the raised top wall of the vapor dome, the inclined sidewall having a vertically lower edge appended to the top wall of the tank and a vertically higher edge appended to the raised top wall of the vapor dome,
• a first vent apparatus mounted on the top wall of the tank to vent the interior region of the tank,
• a second vent apparatus mounted on the raised top wall of the vapor dome to vent the vapor-receiving space of the vapor dome,
• a filler neck having a nozzle-receiving inlet, a fuel-discharging outlet coupled to the interior region of the tank, and a fill tube interconnecting the nozzle-receiving inlet and the fuel-discharging outlet, and
• a nozzle shut-off tube having an inlet end extending through the vapor space of the vapor dome and an outlet end coupled to the fill tube to communicate fuel vapor between the vapor space of the vapor dome and the fill tube of the filler neck until the inlet end of the nozzle shut-off tube is immersed in liquid fuel contained in the tank, wherein the inlet end of the nozzle shut-off tube terminates in the vapor-receiving space at an open-mouthed tip formed in the nozzle shut-off tube and positioned to intersect a reference plane defined by the top wall of the tank.

A tank venting system comprising

• a tank formed to include an interior region, the tank including a top wall overlying a first portion of the interior region and a bottom wall underlying the top wall and defining a floor of the interior region,
• a vapor dome positioned to rise vertically above the top wall of the tank, the vapor dome being formed to include a vapor-receiving space overlying a second portion of the interior region of the tank adjacent to the first portion and communicating with the interior region of the tank to receive fuel vapor generated by liquid fuel contained in the interior region of the tank, the vapor dome including a raised top wall defining a ceiling of the vapor-receiving space and lying at a first elevation vertically above the top wall of the tank so that the top wall of the tank lies at a second elevation vertically above the bottom wall of the tank and vertically below the elevation of the raised top wall of the vapor dome,
• a first vent apparatus mounted on the top wall of the tank to vent the interior region of the tank,
• a second vent apparatus mounted on the raised top wall of the vapor dome to vent the vapor-receiving space of the vapor dome,
• a filler neck having a nozzle-receiving inlet, a fuel-discharging outlet coupled to the interior region of the tank, and a fill tube interconnecting the nozzle-receiving inlet and the fuel-discharging outlet, and
• a nozzle shut-off tube having an inlet end extending through the vapor space of the vapor dome and an outlet end coupled to the fill tube to communicate fuel vapor between the vapor space of the vapor dome and the fill tube of the filler neck until the inlet end of the nozzle shut-off tube is immersed in liquid fuel contained in the tank, wherein the inlet end of the nozzle shut-off tube terminates in the vapor-receiving space at an open-mouthed tip formed in the nozzle shut-off tube and positioned to intersect a reference plane defined by the top wall of the tank and the inlet end is also formed to include a side wall slot extending vertically upwardly from the open-mouthed tip to a point in the vapor-receiving space located between the open-mouthed tip and the raised top wall of the vapor dome.

A tank venting system comprising

• a tank formed to include an interior region, the tank including a top wall overlying a first portion of the interior region and a bottom wall underlying the top wall and defining a floor of the interior region,
• a vapor dome positioned to rise vertically above the top wall of the tank, the vapor dome being formed to include a vapor-receiving space overlying a second portion of the interior region of the tank adjacent to the first portion and communicating with the interior region of the tank to receive fuel vapor generated by liquid fuel contained in the interior region of the tank, the vapor dome including a raised top wall defining a ceiling of the vapor-receiving space and lying at a first elevation vertically above the top wall of the tank so that the top wall of the tank lies at a second elevation vertically above the bottom wall of the tank and vertically below the elevation of the raised top wall of the vapor dome,
• a first vent apparatus mounted on the top wall of the tank to vent the interior region of the tank,
• a second vent apparatus mounted on the raised top wall of the vapor dome to vent the vapor-receiving space of the vapor dome,
• a filler neck having a nozzle-receiving inlet, a fuel-discharging outlet coupled to the interior region of the tank, and a fill tube interconnecting the nozzle-receiving inlet and the fuel-discharging outlet,
• a nozzle shut-off tube having an inlet end extending through the vapor space of the vapor dome and an outlet end coupled to the fill tube to communicate fuel vapor between the vapor space of the vapor dome and the fill tube of the filler neck until the inlet end of the nozzle shut-off tube is immersed in liquid fuel contained in the tank, and
• a liquid fuel-actuated closure mechanism mounted to the nozzle shut-off tube and spring biased into a normally open position.

A tank venting system comprising

• a tank formed to include an interior region, the tank including a top wall overlying a first portion of the interior region and a bottom wall underlying the top wall and defining a floor of the interior region,
• a vapor dome positioned to rise vertically above the top wall of the tank, the vapor dome being formed to include a vapor-receiving space overlying a second portion of the interior region of the tank adjacent to the first portion and communicating with the interior region of the tank to receive fuel vapor generated by liquid fuel contained in the interior region of the tank, the vapor dome including a raised top wall defining a ceiling of the vapor-receiving space and lying at a first elevation vertically above the top wall of the tank so that the top wall of the tank lies at a second elevation vertically above the bottom wall of the tank and vertically below the elevation of the raised top wall of the vapor dome,
• a first vent apparatus mounted on the top wall of the tank to vent the interior region of the tank, and
• a second vent apparatus mounted on the raised top wall of the vapor dome to vent the vapor-receiving space of the vapor dome, wherein the vapor dome includes an inclined side wall having a vertically lower edge appended to the top wall of the tank, a vertically higher edge appended to the raised top wall of the vapor dome, a first end edge between the lower and higher edges, and an opposite second end edge between the lower and higher edges, and a U-shaped side wall having a first end portion appended to the first end edge of the inclined side wall, a second end portion appended to the second end edge of the inclined side wall, a U-shaped upper perimeter edge appended to the raised top wall, and a U-shaped lower perimeter edge appended to the tank, wherein the tank further includes a first end, a filler neck coupled to the first end, an opposite second end lying in spaced-apart relation to the first end, a first side wall extending longitudinally between the first and second ends, the first side wall having one end lying close to the filler neck and extending vertically between the bottom wall and a portion of the U-shaped side wall of the vapor dome and another end lying away from the filler neck and extending vertically between the bottom and top walls of the tank, and a second side wall extending longitudinally between the first and second ends and lying in spaced-apart relation to the first side wall, the second side wall having one end lying close to the filler neck and extending between the bottom wall of the tank and another portion of the U-shaped side wall of the vapor dome and another end lying away from the filler neck and extending vertically between the bottom and top walls of the tank, the top wall of the tank is bisected longitudinally to define a first half section adjacent to the first side wall and a second half section adjacent to the second side wall, the raised top wall of the vapor dome is bisected longitudinally to define a first half portion in close proximity to the first side wall and a second half portion in close proximity to the second side wall, the first vent apparatus is mounted in an aperture formed in the first half portion of the top wall of the tank, and the second vent apparatus is mounted in an aperture formed in the second half portion of the raised top wall of the vapor dome so that the first and second vent apparatus lie in diagonally spaced-apart relation on opposite sides of a reference line longitudinally bisecting the top wall of the tank and longitudinally bisecting the raised top wall of the vapor dome.

A tank venting system comprising

• a tank formed to include an interior region, the tank including a top wall overlying a first portion of the interior region and a bottom wall underlying the top wall and defining a floor of the interior region,
• a vapor dome positioned to rise vertically above the top wall of the tank, the vapor dome being formed to include a vapor-receiving space overlying a second portion of the interior region of the tank adjacent to the first portion and communicating with the interior region for the tank to receive fuel vapor generated by liquid fuel contained in the interior region of the tank, the vapor dome including a raised top wall defining a ceiling of the vapor-receiving space and lying at a first elevation vertically above the top wall of the tank so that the top wall of the tank lies at a second elevation vertically above the bottom wall of the tank and vertically below the elevation of the raised top wall of the vapor dome,
• a tank venting apparatus coupled to the tank to vent the interior region of the tank,
• a dome-venting apparatus coupled to the vapor dome to vent the vapor-receiving space of the vapor dome,
• a filler neck having a nozzle-receiving inlet, a fuel-discharging outlet coupled to the interior region of the tank, and a fill tube interconnecting the nozzle-receiving inlet and the fuel-discharging outlet,
• a nozzle shut-off tube having an inlet end extending through the vapor space of the vapor dome and an outlet end coupled to the fill tube to communicate fuel vapor between the vapor space of the vapor dome and the fill tube of the filler neck until the inlet end of the nozzle shut-off tube is immersed in liquid fuel contained in the tank, and
• a liquid fuel-actuated closure mechanism mounted to the nozzle shut-off tube.

A tank venting system comprising

• a tank formed to include an interior region, the tank including a top wall overlying a first portion of the interior region and a bottom wall underlying the top wall and defining a floor of the interior region,
• a vapor dome positioned to rise vertically above the top wall of the tank, the vapor dome being formed to include a vapor-receiving space overlying a second portion of the interior region of the tank adjacent to the first portion and communicating with the interior region for the tank to receive fuel vapor generated by liquid fuel contained in the interior region of the tank, the vapor dome including a raised top wall defining a ceiling of the vapor-receiving space and lying at a first elevation vertically above the top wall of the tank so that the top wall of the tank lies at a second elevation vertically above the bottom wall of the tank and vertically below the elevation of the raised top wall of the vapor dome, the vapor dome further including an inclined sidewall interconnecting the top wall of the tank and the raised top wall of the vapor dome, the inclined sidewall having a vertically lower edge appended to the top wall of the tank and a vertically higher edge appended to the raised top wall of the vapor dome,
• a tank venting apparatus coupled to the tank to vent the interior region of the tank,
• a dome-venting apparatus coupled to the vapor dome to vent the vapor-receiving space of the vapor dome,
• a filler neck having a nozzle-receiving inlet, a fuel-discharging outlet coupled to the interior region of the tank, and a fill tube interconnecting the nozzle-receiving inlet and the fuel-discharging outlet, and
• a nozzle shut-off tube having an inlet end extending through the vapor space of the vapor dome and an outlet end coupled to the fill tube to communicate fuel vapor between the vapor space of the vapor dome and the fill tube of the filler neck until the inlet end of the nozzle shut-off tube is immersed in liquid fuel contained in the tank, wherein the inlet end of the nozzle shut-off tube terminates in the vapor-receiving space at an open-mouthed tip formed in the nozzle shut-off tube and positioned to intersect a reference plane defined by the top wall of the tank.

A tank venting system comprising

• a tank formed to include an interior region, the tank including a top wall overlying a first portion of the interior region and a bottom wall underlying the top wall and defining a floor of the interior region,
• a vapor dome positioned to rise vertically above the top wall of the tank, the vapor dome being formed to include a vapor-receiving space overlying a second portion of the interior region of the tank adjacent to the first portion and communicating with the interior region for the tank to receive fuel vapor generated by liquid fuel contained in the interior region of the tank, the vapor dome including a raised top wall defining a ceiling of the vapor-receiving space and lying at a first elevation vertically above the top wall of the tank so that the top wall of the tank lies at a second elevation vertically above the bottom wall of the tank and vertically below the elevation of the raised top wall of the vapor dome,
• a tank venting apparatus coupled to the tank to vent the interior region of the tank,
• a dome-venting apparatus coupled to the vapor dome to vent the vapor-receiving space of the vapor dome,
• a filler neck having a nozzle-receiving inlet, a fuel-discharging outlet coupled to the interior region of the tank, and a fill tube interconnecting the nozzle-receiving inlet and the fuel-discharging outlet, and
• a nozzle shut-off tube having an inlet end extending through the vapor space of the vapor dome and an outlet end coupled to the fill tube to communicate-fuel vapor between the vapor space of the vapor dome and the fill tube of the filler neck until the inlet end of the nozzle shut-off tube is immersed in liquid fuel contained in the tank, wherein the inlet end of the nozzle shut-off tube terminates in the vapor-receiving space at an open-mouthed tip formed in the nozzle shut-off tube and positioned to intersect a reference plane defined by the top wall of the tank, wherein the inlet end is also formed to include a side wall slot extending vertically upwardly from the open-mouthed tip to a point in the vapor-receiving space located between the open-mouthed tip and the raised top wall of the vapor dome.

A tank venting system comprising

• a fuel tank unit formed to include an interior region having a predetermined liquid fuel capacity,
• a first vent apparatus coupled to the fuel tank unit to vent the interior region,
• a second vent apparatus coupled to the fuel tank unit to vent the interior region, the second vent apparatus including a housing having an inlet and an outlet and a flow control assembly positioned for movement in the housing to regulate discharge of fuel vapor admitted into the housing via the inlet and from the housing via the outlet,
• means for blocking flow of pressurized fuel vapor from the interior region of the fuel tank unit through the first vent apparatus once the volume of liquid fuel in the interior region of the fuel tank unit is at least 90% of the predetermined liquid fuel capacity of the interior region of the fuel tank unit so that any further venting of pressurized fuel vapor from the interior region of the fuel tank unit is regulated by movement of the flow control assembly in the housing Of the second vent apparatus,
• a filler neck coupled to the fuel tank unit, and
• a nozzle shut-off tube extending into the interior region of the fuel tank unit through an aperture formed in the fuel tank unit, the nozzle shut-off tube having an inlet positioned to be closed by liquid fuel in the interior region of the fuel tank unit once the volume of liquid fuel in the interior region of the fuel tank unit is greater than 90% of the predetermined liquid fuel capacity of the interior region of the fuel tank unit.

A tank venting system comprising

• a fuel tank unit formed to include an interior region having a predetermined liquid fuel capacity,
• a first vent apparatus coupled to the fuel tank unit to vent the interior region,
• a second vent apparatus coupled to the fuel tank unit to-vent the interior region, the second vent apparatus including a housing having an inlet and an outlet and a flow control assembly positioned for movement in the housing to regulate discharge of fuel vapor admitted into the housing via the inlet and from the housing via the outlet,
• means for blocking flow of pressurized fuel vapor from the interior region of the fuel tank unit through the first vent apparatus once the volume of liquid fuel in the interior region of the fuel tank unit is at least 90% of the predetermined liquid fuel capacity of the interior region of the fuel tank unit so that any further venting of pressurized fuel vapor from the interior region of the fuel tank unit is regulated by movement of the flow control assembly in the housing of the second vent apparatus, wherein the fuel tank unit includes a tiered top wall, a bottom wall underlying the tiered top wall, and an endless side wall interconnecting the tiered top wall and the bottom wall to define an interior region therebetween, the tiered top wall includes a first tier at a first elevation above the bottom wall and a second tier at a second elevation above the bottom wall, the second elevation is greater in magnitude than the first elevation, the first vent apparatus is mounted on the first tier of the tiered top wall to vent the interior region of the fuel tank unit, and a second vent apparatus is mounted on the second tier of the tiered top wall to vent the interior region of the fuel tank unit.