I decided to look after that, and I still need to know where the wires are connected. I have got 2 fuel tanks but with different wires colours :

1) pin1: brown/black - pin2: brown/green - pin3: green/yellow
2) pin1: brown/black - pin2: brown/green - pin3: brown/red

I know the wires are going through a 5pins plug, but I still don't know where the 3 wires goes.

Thanks for your help !