My X350 technical notes for the fueling system has nothing called a Fuel Purge Valve, but does have a Parallel Pressure Relief Valve, shown on a diagram as situated in the fuel tank.
"The function of the valve is to : -
- assist engine start by retaining a pre-set fuel pressure in the fuel delivery line and fuel rail
- limit fuel rail pressure due to temporary vapor increase in hot conditions
- limit fuel rail pressure caused by sudden load changes, such as fully open to fully closed throttle transitions
- prevent leakage from the tank in even the fuel delivery line is severed"
Question - is this your problem component ?
Where did you get that part number from, as a search on it gives your description ?
There is, of course, a purge valve in the evaporative emissions control system which recovers fuel vapour, (petrol) into a canister called the EVAP canister, from whence it is purged into the engine via the Canister Purge Valve. This vents the vapours into the inlet manifold. The valve is controlled by the ECM and operation is based on engine operating conditions using: -
- engine speed and load
- coolant temp
- time from engine start-up
- closed loop fuelling.
The EVAP system has no influence on fuel rail pressure, other than the ECM controlling it, bearing in mind that the EVAP purge cycle will be putting fuel into the system as well as that passing via the injectors, but this should be controlled by the ECM.
"The function of the valve is to : -
- assist engine start by retaining a pre-set fuel pressure in the fuel delivery line and fuel rail
- limit fuel rail pressure due to temporary vapor increase in hot conditions
- limit fuel rail pressure caused by sudden load changes, such as fully open to fully closed throttle transitions
- prevent leakage from the tank in even the fuel delivery line is severed"
Question - is this your problem component ?
Where did you get that part number from, as a search on it gives your description ?
There is, of course, a purge valve in the evaporative emissions control system which recovers fuel vapour, (petrol) into a canister called the EVAP canister, from whence it is purged into the engine via the Canister Purge Valve. This vents the vapours into the inlet manifold. The valve is controlled by the ECM and operation is based on engine operating conditions using: -
- engine speed and load
- coolant temp
- time from engine start-up
- closed loop fuelling.
The EVAP system has no influence on fuel rail pressure, other than the ECM controlling it, bearing in mind that the EVAP purge cycle will be putting fuel into the system as well as that passing via the injectors, but this should be controlled by the ECM.
