Alternative for petrol pump W108

Hello together, I just joined and am looking forward to the community. I also have a question, I drive a Mercedes Benz W108 280 SE year 1969. Now yesterday at an exit the petrol pump failed to me, it is the pump with the 3 connections, one tank supply line, one tank return line and one injection pump. So now to my question. Since this pump is not quite cheap and I had problems with it several times, I wanted to inform myself briefly. n, if there is an alternative pump to have for a small price? What do you have to consider in general? Thank you for your support 🙂