Hi Lindsay,
Thanks for your advice. I had a look at the hose going from the water level switch into some kind of connector (the diaphragm isn't accessible from the top); it was on but not very tight, so I replaced it with a vacuum hose I had left over from my car. It's the same internal diameter (almost) but the outer thickness is different; will this matter? Do you know what this hose actually carries?
Thanks again for your help.
Daniel Beattie
February 2005