how can I fix my camping gas cooker?

The usual problem is rust in the burner ring, just under the flame. a good way to test this is to put a feeler gauge ( ie for doing the tappet clearance on your car- nearly everyones got them)down the circle where the gas comes out and shake or tap out any rust. The problem is caused by insufficient aeration and if this doesnt work, have a look to ensure there are no obstructions to the air inlets near the jet- which is usually near the on/off taps

Jim Evans
December 2004