Ford Fiesta Courier Diesel

Hello I have a start problem with my Ford Courier Diesel. If it’s cold then it only starts very willingly and I have to give 3 times before glowing and with the reason org and full gas until it starts. But that’s what he does only if he has stood longer than 2 hours. So if the engine is cold. Once the engine has run it jumps immediately without problems. I don’t know so much about it and hope someone can give me a tip what it could be. The courier is EZ 22.12.1998 and has 46500 km on the speedometer. Thanks to Vilen already in advance and a good slide into the new year.