Fuel filter was done about 12 months ago mate.

I am going to check that the braided rubber hose that goes from the outlet of my pump to the hard metal line on the cradle hasn't partly collapsed.. thus creating that funny "water hammer" noise.

I'll also check the outlet of the pump for that valve you were talking about.

If thats not it, i'll try the reg.. thanks mate

LOL Dave, there is only one now.. I deleted the other!