In reply to The Mole: Some times the pipe between the pump and the stove gets cloged up with the dirt in unleaded petrol try running it on Coleman fuel for a bit it burns much cleaner and helps keep the pipe clean. Also once you have finished using the stove don't turn it off using the valve simply turn the bottle the other way up so off is facing upwards and just put a little coleman fuel with each bottle of unleaded it helps a little. Hope this helps