My 1990 Plus 4 stopped suddenly yesterday and it seems that the fuel pump is not working. It's located in front of the tank on a horizontal steel plate that is fixed to the chassis; it's easy to access the pump by lifting the rear timber shelf.

As far as I can see it's not maintainable. Possibly an electronic device? It's got an inflow pipe from the tank and a slightly smaller outflow pipe heading off towards the front. There are two electrical connections (spade connectors).

Has anyone else encountered a pump problem, do you know the manufacturer and model number and perhaps most importantly where do I go for a replacement?

I would be grateful for all help and advice.