A pressure reducing valve is a container separated by a diaphragm on which a valve is attached that closes the fuel drain hole under the action of a spring
The pressure reducing valve maintains a constant pressure in the power system of about 0.3 MPa
The upper part of the pressure relief valve is connected to the receiver with a vacuum hose.
When the pressure drop in the receiver is not higher than 0.3 MPa, the valve is closed and the pressure in the supply system rises.
When the fuel pressure reaches more than 0.3 MPa, the membrane bends, opening a hole, and excess fuel is drained into the fuel tank.
As soon as the fuel pressure drops to 0.3 MPa, the membrane returns to its original position and closes the fuel drain hole.
Reduce the pressure in the power system if the engine has just been stopped.
Disconnect the wire from the negative terminal of the battery.
Remove the engine fuel line.
Disconnect fuel drain hose 1 and vacuum hose 4 from pressure reducing valve 3.
Unscrew the two fastening bolts 2 and remove the pressure reducing valve 3 from the engine fuel line.
Install the new valve in reverse order.