Hello, is there any electric fuel pump on them?
I have changed fuel filter but it will not start.
And I can't hear any pump when ignition is on, and
under the backseat is only fuellevels.
Is a cx5 2,2 skyactive diesel
/ ben

 

Did you have trouble before replacing the filter? if not, you need to bleed the fuel thru.

The port circled in Blue is the bleed port, you need to use a vacuum bleed unit, like a Airboy ( brake fluid bleeder) to suck the fresh fuel thru the new filter.