Brendan, at least you seem to be getting somewhere. On the assumption you have found the relay, have you identified if it is being fed with 12 volts...?
There will perhaps be two feeds at the relay, one for the coil which I suspect energises the coil only when all the safety/security switches are closed, thus without the engine running or the ign key held in the start position, I might expect that relay coil feed to be dead..?
However the feed for the pump which is switched on to the white/pink when the relay coil in energised... should perhaps be live and sitting waiting to be switched through to the pump, if/when all the other safety/security switching has taken place for the coil to energise/click.
If any of the above is correct then whatever coloured wire is waiting at the relay to give the white/pink a supply may be available to be connected to the white /pink at the relay to then feed through to the fuel pump...?
If there is no supply at the relay perhaps best to check the fuses..?
Should you find a blown fuse, it is possible there may be a problem with the pump or on the white/pink from the relay to the pump that may have taken out a fuse,
perhaps best to pull the pink and white at the tank and keep it away from earth and check to see if the relay clicks with the IGN key held in the START position..?
if the relay clicks, check for voltage on the white pink at the relay, and if you have it at the relay then try to see if you get 12 volts at the white/pink at the tank....
If you get 12 volts,on the white/pink at the tank having replaced a blown fuse, then chances are you have a pump issue...?
Looking at things from a different angle... The pump is quite a high current draw and loose or dirty earth connection can fail under load.. i.e, the white /pink can give a 12 volt reading with a volt meter across a live and the earth, but when the load of the pump is connected, the earth can partly fail causing the voltage to drop to the extent that while the full 12 volts might be available on the white/pink at the pump... the pump it`s self requires a good earth to make use of the voltage provided by the white/pink.
All just using logic, flawed or otherwise, in the hope it might be of some help...?
Good luck Brendan.
