Hi Phil,

I'm with Alan, if clip says that there is a problem with the Injectors then thats where you need to start. An Amps clamp or a scope may be your easiest option.

Note; these systems can operate at voltages up to 200 volts !!

The 10 bar back pressure is used to quickly fill the internal chambers in the body of the unit, without this the Injector will not work correctly.

The supplier of your pressure test kit should have an adapter (or four of them) for testing the leak back on this type of system. HTH

Regards Mark