Hi all, put my car back to petrol, and now the sub tank doesnt work. The light in the dash doesnt come on when you turn key, sub switch light no go when pushed. have checked wiring but any advice will do where to look. gas system was lpgas1 vap inject. Can anyone help with wiring changes they have seen on gas systems, this had the sub tank with main tank sender in it. Also the sub gauge reads fuel level main tank looks ok.