just fitting a fuel pressure regulator (not an fse one) I know it goes in between the middle of the 3 pipes on the right of the manifold, is this pipe a fuel supply or a return pipe, cos need to know which way the flow is, so I can connect my input and output the right way, as at the moment I only have about 15psi fuel pressure and it wont adjust any more.

 

SORTED, fuel return. swapped pipes around now have 3.2 bar pressure