XUD9 head gasket change video

[unclebeast]

The solenoid you're referring to in your photo is called "LFB" which is for controlling Load-Dependent Start of Injection, i.e. it receives pressure from the governor system and increases advance relative to the load on the engine, rather than just engine speed - that's what that thin pipe running down the front of the pump is for. The solenoid power on the front is just so you can increase the timing when cold - it's inactive once the engine speed/load increases enough as it moves past the amount of advance it increases.

Not required to be connected.

Thank you Ruan...does that mean this bosch pump isnt an ecu version? what does the black box on throttle arm with the roller wheel have (top left middle photo)