The fuel filter should be replaced whenever the fuel pressure drops below the specified value (270-320 kPa, 2.8-3.3 kgf/cm2, 40-47 psi) after making sure that the fuel pump and the fuel pressure regulator are OK. Relieve fuel pressure (see page 11-430). Disconnect the hose and quick-connect fittings (A) (see page 11-568). Remove the fuel filter (B). Install the part in the reverse order of removal