Omega B – Y22DTH – Start problems

Hello everyone. I have an Omega 2,2 Dti with 308,000 km Have like many others also the problem that when it is cold, I have to pump diesel up with a small ball pump in the engine room. I just changed the seals yesterday at the injection nozzles. Today the same thing again 🙁 . I am resident in Hungary, but the mechanics here… .naja… ..so I prefer to do it myself. Do you have an idea where I can look for faults. The pipes should be tight. Can it be i m murmurst fall into the pump be? Engine gear is very quiet and normal. When it is warm, it starts immediately. Hope one of you can help. Mfg and thank you shon in advance. Kent