Disconnect the negative battery cable. Keep a Class B dry chemical fire extinguisher available. Always relieve the fuel pressure before disconnecting a fuel line. Wrap a shop cloth around a fuel line when disconnecting the line. Always use new O-rings. Do not replace the fuel pipes with fuel hoses. Always use a back-up wrench when opening or closing a fuel line.
Release the fuel vapor pressure in the fuel tank by removing the fuel tank cap and reinstalling it.
Cover the fuel line with an absorbent shop cloth and loosen the connection slowly to release the fuel pressure gradually.