1999 "EE" Evinrude 70HP 4-Stroke Service Manual, P/N 787023, Page 44Get this manual
Vapor Separator
The vapor separator is located on the port side of the powerhead, behind the intake manifoldIt's fuel reservoir that serves multiple functions: internally mounts the HP pump receives incoming fuel from the LP pump through float, needle, and seat mechanism accepts excess fuel from the fuel rail incorporates the pressure regulator vents fuel vapor
to the air silencer
The separator is also water cooled to reduce fuel problems associated with vapor lock and hot soakThe water cavity is self-draining when the engine is shut offThe fuel chamber can be drained by loosening screw at the bottom of the housingFuel Pressure Regulator
m The pressureoperating pressure to 36in thePSI (248separatorIt regulator is integrated vapor regulates system 21 kPa) When pressure exceeds this value, excess fuel is routed back to the vapor separator via tee fitting and hose in the supply line