FUEL PUMP RELAY

Any ideas where to source a new fuel pump relay for a 1983 GTi (1.8 DX).  I bought a replacement one of eBay, however the new relay is continuously switching (clicking), when the engine is running.  The original part number was 3.300.210.  The one I got off eBay was 321 906 059F.

Any help or advice would be appreciated!

Ta,
Ross

If the relay is O.K. it sounds as though the system isn't maintaining pressure. Why did you replace it. i.e. what was the problem with the relay you replaced? However I am not an expert on these things. I wish I was

The original one stopped working completely.