Multi-layer primer apparatus and methods

A multi-layer primer apparatus, comprising:

• a membrane to substantially prevent diurnal emissions from escaping from a cavity within the primer apparatus;
• a casing coupled to an outer surface of the membrane;
• and
• a body coupled to an inner surface of the membrane to form the cavity and force the membrane and the casing outward.

A multi-layer primer apparatus, comprising:

• a flexible body defining an internal chamber to be fluidly coupled to a fuel system, the body comprising:
• a first material having a low permeation characteristic to substantially prevent diurnal emissions from escaping through the body;
• a second material adjacent the first material and having a relatively high resiliency compared to the first material to enable the body to return to an uncompressed shape when the body is deflected and released by a user;
• and
• a flexible insert to be contained in the body such that the first material is disposed between the second material and the flexible insert and having a relatively high resiliency compared to the first material to hold the first material against the second material when the body is deflected and released by the user.