Fuel system bleed

[AngryWO2]

Good day all
Hope someone can help, I changed the SCV went for test drive the vehicle went into limp mode again.
I reset the ECU twice doing the accelerated tap dance.
Because I removed fuel lines to do the SCV, thinking air in the system I went to the fuel filter and pushed the black priming knob it was easy to push and didn’t harden.
I pushed it heaps went for drive seemed ok, but would like to get that pump to harden up.

 

[Old.Tony]

I know the primer bulb hardens up in the D40 but not sure how it works in the D22. There might be a return line that spills excess fuel in the priming system back to the tank, which would stop it from ever reaching any sort of higher pressure.

 

[AngryWO2]

I know the primer bulb hardens up in the D40 but not sure how it works in the D22. There might be a return line that spills excess fuel in the priming system back to the tank, which would stop it from ever reaching any sort of higher pressure.

Thanks Tony,
After replacing SCV and fuel filter, first start in the morning rough idle, smooth idle up and down.
Taking it to a Diesel specialist tomorrow 11 Feb, will give feed back.