The mini has a Red Facet fuel pump, however I have difficulty starting the damn thing, is the pump mounted too high?

Its not a recent pic, the level on the regulator at the moment is about a 1/4 up from the bottom
It has fuel but not much, have stuck about a fiver in?
I might try bringing the Reg and pump down to the boot floor to see if that makes any difference? Or taking the Reg out and have a pipe going directly to the pump?
Any ideas?
Cheers