1 and 3 are the same thing. I do believe that's the aircon dryer.
Where is 2 approximately?
Is that the pipe that is connected to the engine under tray ? If so it doesDoes it has Webasto? https://audi.7zap.com/en/rdw/audi+a2/a2/2000-248/2/261-261050/ Seems like part nr 6, fuel metering pump...
Edit: First one is fuel filter.
Pump can be had for 25 on eBay
Common on many night heaters
Excellent, thank you for that.For 2-5KW Webasto Eberspacher Heater 12V Car Air Diesel Parking Oil Fuel Pump UK | eBay
Air Diesel Parking Oil Fuel Pump 12V For 2KW-5KW Webasto Eberspacher Heater UK. 12V Car Air Diesel Parking Oil Fuel Pump For 2-5KW Webasto Eberspacher Heater UK. 12V Oil Fuel Pump for 2KW to 5KW Webasto Eberspacher Heaters.www.ebay.co.uk
Works fine just ensure 12v
hgv ones are 24v
Fitted to replace one that disintegrated during hand brake cable replacement
aluminium*steel