Thanks for the comments but I do know how the abs pump sounds etc.

I have listened to it carefully and indeed it sounds like fuel rushing through the line. Except the sound comes straight out of the regulator and it stays like that and doesn't stop. (Fuel pump also keps running, but that I already knew.)

So with the fuel pump running in ignition mode you shouldn't hear the fuel rushing like mad through the regulator? I have never heard this before on my previous cosworths, that's why I noticed it.

Also can say the cosworth has a fuel problem and maybe it is a default fuel pressure regulator. But I just want to know if this sound can indicate something before just pointing to say the regulator should be replaced.

I want to know for sure if there is a problem, not just changing something because it seems to make a weird noice.

@ rapidcossie; what do you mean by "have you checked the black hose going to the reg?"