Examination
Turn the ignition on and off. The solenoid switch should click audibly.
Otherwise, unscrew the fastening of the electrical wire and supply voltage to the electromagnetic switch with an auxiliary wire from the positive pole of the battery.
If the solenoid switch now trips, check the wiring according to the wiring diagram and replace if necessary. If the electromagnetic switch does not work with good wiring, it must be replaced.
Withdrawal
Unscrew the fastening of the electric wire and unscrew the electromagnetic switch -1-.
Installation
Remove piston and valve spring and insert into new solenoid switch. Pay attention to the correct position of the sealing ring.
Screw a new solenoid switch into the fuel pump and tighten to 20 Nm.
Connect the electrical wire to the electromagnetic switch.