Thanks Tanuki, The model I have is a county 110 which is a 1988 with a 19J 2.5td engine fitted if this is any help, thought it might have been the connections on the tank as both protective rubber fittings over the electrical connections were off. I cleaned the connections and sprayed them with dw40 and replaced but didn't change any thing. Hopefully this will not be the £300+ way to go!