New bit of info which MAY help my problem.

Rossco, you mentioned that the noise my pump makes sounds like "water hammer".

I mentioned the same thing to Sean @ ASG yesterday, and he said "check the damper valves that go near the fuel filter".



Did a search on these, and their intended purpose is to prevent resonation in the lines.. exactly like water hammer on plumbing pipes!!

Found this..

http://www.rexnet.com.au/forum/index...&#entry1694142

Also, I found information on NASIOC which suggests that if they're mounted incorrectly, they wont work. They need to be mounted upright. I somehow think mine might have been mounted the wrong way after my fuel filter was replaced (which co-incides with me replacing the pump and the noise starting).

Anyway its definitely another area I can check out, so I will be looking at this closely.