Liquid Vapor Separator
| ITEM | DESCRIPTION |
|---|---|
| 1 | ROV (roll over valve) |
| 2 | Vent pipes |
| 3 | FLVV (fuel level vent valve) |
| 4 | OPRV (over pressure relief valve) |
The LVS prevents the escape of liquid fuel through to the fuel tank vent pipes. The LVS is installed in a bracket in the top center of the fuel tank. Vent pipes connect the LVS to two connectors in the upper rear corners of the fuel tank. The RH connector is for a vent pipe connected to the top of the fuel filler pipe. The LH connector is for a vent pipe connected to the EVAP (evaporative emission) canister.
For additional information, refer to: Evaporative Emissions
Three valves are incorporated into the LVS:
- An OPRV, to relieve any excess pressure in the fuel tank into the LVS
- A FLVV, to limit the maximum fuel level when filling the fuel tank
- A ROV, to prevent the escape of fuel through the vent pipes if the vehicle overturns, and allow the fuel tank to vent when the FLVV is closed (i.e. when the fuel tank is full).
Vapor leaving the fuel tank passes through either the FLVV or the ROV during normal vehicle use. During filling, if the fuel reaches the full level the FLVV closes and prevents fuel vapor passing through to the LVS. This causes the pressure in the fuel tank to rise, which in turn causes the pump filling nozzle to cut off at approximately 17 mbar (0.25 lbf/in2 ).
The ROV contains a valve that closes if the vehicle overturns, and prevents liquid fuel escaping from the fuel tank through the vent pipes.
The ball in the top of the ROV provides a pressure hold function, which is set at 45 mbar (0.65 lbf/in2 ). This prevents trickle filling or over filling of the fuel tank.