ahh excellent, i always wondered why that was drilled, its like the hole is enough for a small electricians screwdriver, would it be worth me getting another fuel pressure regulator and trying that see if it makes any difference to the engine running. its pulls pretty well jus sounds cammed on the tick over and i know its standard.

would a regulator from another efi be ok if it wasnt tampered with? any reason why some1 would adjust the pressure?