How can I troubleshoot the faulty fuel pump in an Audi 80?

I have a 1990 Audi 80 and recently the fuel pump has started to fail, causing the car to not start. What steps can I take to troubleshoot and fix the issue?

The first thing you should check is the fuel pump relay, as it is a common cause of fuel pump failure in Audis. You can use a multimeter to test the relay and see if it is functioning properly.

If the relay is working correctly, then you should move on to checking the fuel pump itself. Start by checking the electrical connections and wiring for any damage or corrosion. If everything looks good, you can try replacing the fuel pump to see if that resolves the issue.

In some cases, the issue may not be with the fuel pump itself, but rather with the fuel pump control module. This module controls the fuel pump's operation and can cause issues if it malfunctions. You can test the module using a scan tool to see if it is functioning properly and replace it if needed.