Unfortunately Electrical faults as with any vehicle is a tracing process. Usually the pump is on a seperate circuit. It's a case of start at the feed from battery to the 12volt fuse block check all fuses and if you can identify the lights fuse check the power in from battery could be bad link or corroded joint [I've had that on a pump circuit].
If they are still going give these a ring for wire diagram.
Avondale Caravans
Carlyon Road
Atherstone
Warwickshire
CV9 1JE
01827 715231
For Leda and other models
Gas: Best to be safe and get it checked by gas fitter that is also registered to work on LPG gas leasure appliances. If you have used it before ok then it must be the gas valve again a gas fitters job as it should be tested after fitting.
bob
February 2010