Pontiac FIREBIRD 1972 Service Manual page 762

EMISSION CONTROL SYSTEMS 6D- 19
INSTALL 5. Tighten mounting bolts securely.
1 . Install pump with mounting bolts loose.
2. Install pump pulley as outlined.
3. Install and adjust belt as outlined.
4. Connect the hoses at the pump.
PRESSURE RELIEF VALVE REPLACEMENT
NOTE: The pressure relief valve is incorporated
in the diverter valve. The complete unit must be
replaced to correct a malfunction of the relief
valve.