Conversion of the level control pump under the spare wheel trough

Hello, I’m not a screwdriver myself, but I have a fogening problem: Would like to convert a Phaeton V6 to autogas, with a wheel dump tank in the spare wheel dump. Here, the said pump, which has to be installed first, before the spare wheel dump can be used. Various inquiries with VW operations in my environment all brought a cancellation. But I have read here in the forum and on the internet that it is done. Should it even be relatively easy after a contribution, since the cables are all long enough to move the pump into the right trunk. Does anyone know about the repair and could possibly even perform it against appropriate honoring? Come from the greater Hameln/Hannover Bielefeld area.