Carpet cleaner (Llandrindod LD1)

I bought this Russell Hobbs carpet cleaner a while ago, second hand and in good faith. It does not work and has never worked - the electrics are fine but the liquid feed doesn’t work, no cleaning fluid gets down to the brushes. I’m fed up of it gathering dust so if you think you can make it work you ‘re welcome to it. It is quite heavy but has a good handle.