Quick-connect (push type) fuel line fittings must be disconnected using proper procedure or the fitting may be damaged. There are two types of retainers used on the push connect fittings. Line sizes of3/8and5/16inch diameter use a hairpin clip retainer. The1/4inch diameter line connectors use a duck-bill clip retainer. In addition, some engines use spring-lock connections, secured by a garter spring, which require Special Spring Lock Coupling Tools 49 UN01 051 and 49 UN01 052 (or equivalent) for removal.