A vacuum assembly for fuel degassing, comprising: a housing; a movable assembly positioned within the housing, and including a first portion and a second portion, a first chamber in fluid communication with a first port being formed between the housing and the first portion, a second chamber in fluid communication with a second port being formed between the housing and the second portion, and a third chamber in fluid communication with a third port being formed between the housing and part of the movable assembly between the first portion and the second portion, wherein the movable assembly is configured to move within the housing in response to pressure generated by fluids communicated to each of the first, second and third chambers (52, 62, 66) via the respective first, second and third ports (74, 76, 78), and wherein movement of the movable assembly relative to the housing from a first position to a second position creates a low pressure area in the first chamber; and a valve operable to selectively expel fluid from the first chamber; characterized in further comprising: a fluid flow conduit extending between and fluidly coupling the first chamber and the second chamber, the valve disposed along the fluid flow conduit; and a leakage valve disposed within the fluid flow conduit, the leakage valve being movable between a first position and a second position to restrict a flow through the fluid flow conduit upon detection of an undesired fluid within the low pressure area. a housing; a movable assembly positioned within the housing, and including a first portion and a second portion, a first chamber in fluid communication with a first port being formed between the housing and the first portion, a second chamber in fluid communication with a second port being formed between the housing and the second portion, and a third chamber in fluid communication with a third port being formed between the housing and part of the movable assembly between the first portion and the second portion, wherein the movable assembly is configured to move within the housing in response to pressure generated by fluids communicated to each of the first, second and third chambers (52, 62, 66) via the respective first, second and third ports (74, 76, 78), and wherein movement of the movable assembly relative to the housing from a first position to a second position creates a low pressure area in the first chamber; and a valve operable to selectively expel fluid from the first chamber; characterized in further comprising: a fluid flow conduit extending between and fluidly coupling the first chamber and the second chamber, the valve disposed along the fluid flow conduit; and a leakage valve disposed within the fluid flow conduit, the leakage valve being movable between a first position and a second position to restrict a flow through the fluid flow conduit upon detection of an undesired fluid within the low pressure area. a fluid flow conduit extending between and fluidly coupling the first chamber and the second chamber, the valve disposed along the fluid flow conduit; and a leakage valve disposed within the fluid flow conduit, the leakage valve being movable between a first position and a second position to restrict a flow through the fluid flow conduit upon detection of an undesired fluid within the low pressure area.