2,5tdi 0550 and lack of power,after fuel filter change

sosalele

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Evrything was fine ,car has 300k, its 2000 2.5tdi 150hp automatic. After new year i decide to change fuel filter because evrything else have been changed and it was only thing that havent. So i bought new filter(swag) changed it and then wanted to get air out of sytem. I tought that tank pump should push fuel to filter but it didnt so i took out pump mess whit it, but i put it like it was and put it in back in tank. Then i pushed air out off system manualy and car started after minute of crnaking.
It was running Ok no problems , and evrything was fine. Aftee 5km it started shaking and looaing power. I could get it oved 2000rpm, i turned off and start again,and it was good agaib, drove 2km more and again could't go over 2000rpm. And it showes 0550 fault.
Couls it be main fuel pump? And why ? I didnt toch main fuel pump.