Hi again - thank you for your reply / message -
Im not so sure the "big hint" is the 15 amp fuse you refer too - what is that fuse for / which one is it -? you haven't stated.
You could have blown any fuse with the wiring as you had it --
Going back to testing for power to the pump you don't need a wire diagram for that - you have two thicker wires and either one or two thinner.. the thin are for the gauge so you are looking to power on one of the two thicker ones.. one is an earth / ground, one is power.. so check both - looking for power. If you have power on either one, you know the circuit is there - if on test you don't find power at all .. then you are back to the relay - ecu / circuit.
-- If as you say the fuel pump is not priming then yes as you say, that narrows it down to that circuit.
If you do not have power to the pump - AND you dont have power at the relay then you need to check the connections to the relay - and back to the "main relay"... and then , ECU.. the relay is actuated from the Ecu. Power comes from the main relay to the fuel pump control unit and then to the pump.
Let me know how you go -- but please I do click on the OK / Exc ratings for me at this point- Thank you..
-- Again - you can come back to me anytime as you may need after. Thank you.