§ 1060.105 What diurnal requirements apply for equipment?
(a) Fuel tanks must meet diurnal emission requirements as follows:
(1) Marine SI fuel tanks, including engine-mounted fuel tanks and portable marine fuel tanks, must meet the requirements related to diurnal emissions specified in this section.
(2) Large SI fuel tanks must meet the requirements related to diurnal emissions specified in 40 CFR 1048.105.
(3) Recreational vehicles are not subject to diurnal emission standards.
(4) Small SI fuel tanks are not subject to diurnal emission standards, except as specified in paragraph (e) of this section.
(b) Diurnal emissions from Marine SI fuel tanks may not exceed 0.40 g/gal/day when measured using the test procedures specified in § 1060.525 for general fuel temperatures. An alternative standard of 0.16 g/gal/day applies for fuel tanks installed in nontrailerable boats when measured using the corresponding fuel temperature profile in § 1060.525. Portable marine fuel tanks are not subject to the requirements of this paragraph (b), but must instead comply with the requirements of paragraphs (c) and (d) of this section.