Vauxhall Astravan engine making tapping noise

I've just put a second hand engine in my 2001 Vauxhall Astravan. From what I can tell, the engine was good and the only thing that needed changing was the fuel pump. However, I started it up and it is making a loud knocking/tapping noise from the top end of engine. Any ideas what this could be?

Asked on 27 August 2013 by funkypunk

Answered by Honest John
Might be an airlock between the fuel pump and the injector rail.
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