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 of3/8and5/16in. diameter use a hairpin clip retainer. The1/4in. diameter line connectors use a duck-bill clip retainer. In addition, some engines use spring-lock connections, secured by a garter spring, which require Ford Tool T81P-19623-G (or equivalent) for removal.