CL 500 (215.375) V8-5.0L (113.960) (2000)
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Refueling Control Valve: Description and Operation
Pressure Relief Valve, Location/Task/Design/Function
Pressure Relief Valve, Location
Pressure Relief Valve, Task
82
Safety valve
Above filler neck
Pressure Relief Valve, Task
Pressure Relief Valve, Task
Limiting the pressure in the ORVR vent line if fuel tank overfilled or if gasoline pump nozzle faulty (does not switch off).
Pressure Relief Valve, Design
Pressure Relief Valve, Design
82
Pressure relief valve
a
ORVR vent line (from filler neck to activated charcoal canister)
b
Hose line to pressure relief valve
c
Fuel overflow line to atmosphere
d
Air admission to diaphragm chamber
Housing with internal diaphragm which seals off the line to the pressure relief valve by means of a spring.
Pressure Relief Valve, Function
Pressure Relief Valve, Function
The diaphragm lifts off at a pressure of approx. 60 to 90 mbar. The fuel overflow line to atmosphere opens. Air is admitted to the diaphragm chamber.
