How to troubleshoot low fuel pressure in Audi 80?

I have been experiencing problems with low fuel pressure in my Audi 80 and it is causing my engine to stall frequently. I have checked the fuel pump and filter but they seem to be in good condition. What could be causing this issue and how can I fix it?

First, check for any fuel leaks in the fuel line or connections. If there are no leaks, it could be a problem with the fuel pressure regulator. You can try replacing it or have a mechanic check it. Also, make sure the fuel injectors are clean and not clogged.

Another possible cause for low fuel pressure could be a faulty fuel pump relay. You can try replacing it to see if it solves the issue. Additionally, check the fuel pressure sensor and its wiring for any damage. A damaged sensor can also cause low fuel pressure.