best done by someone who is confident with auto electrics as there may be more than just that pump going throught the same fuse. the cowboy way would be to find the wire feeding the pump, cut it and run a wire into the cab of the van then fit a switch. doing that means you would have to switch it on before starting the van and switch it off at the end of the journey. Its a bit rough doing it this way but the outcome would be the same.