Yellow relay with yellow plug is fuel one IIRC

PM SECS or Ryan,both helpfull when it comes to cossie wiring

As said above though,you really need to run new wires from the battery to the fuel pump,I put new positive and earth from battery to pump

Use the original positive wire that goes to the fuel pump to switch on a new relay that you fit in the boot area somewhere,do a search on here,plenty of topics on it

The wiring degrades between battery and original relay,so this is why you should put new/stronger wire direct from battery