Hi all Firstly, thanks to all the knowledgeable posters on this site whose comments and advice I've often found informative, useful and interesting. I have an MSR fuel pump which came with (what I believe is) an earlier model Whisperlite International - labelled and boxed as such but with rounded wire legs like 600 if that helps with identification. I bought this just about the end of the century or the early 2000s and have used it pretty regularly since. I recently found that once the fuel bottle was pumped up to pressure, the pump was leaking very slightly from the fuel tube port. Rather than eat a cold supper I moved well away from my tent, reduced the amount of (Coleman) fuel in the bottle a minimum and went ahead and cooked on it without issue. After cooking, I was able to turn off the fuel flow sufficiently to cut the flame but if left connected and pressured-up, the pump continued to slowly drip fuel down the tube into the priming pan. Not good. Back home, I checked the only obvious source of the fault; the control valve o-ring but that seemed okay and there are no signs of damage to the outside of the pump body i.e. no cracking or splits in the casing. I also swapped out the entire control valve assembly with a brand new assembly from a replacement pump but the issue persists. I can only conclude that the pump has failed somewhere inside the chamber where the control valve stem sits which is why it's no longer possible to fully shut off the control valve. I've looked here and elsewhere for similar failures but can't find any mention of any (perhaps I haven't looked hard enough). I've also contacted Cascade Designs but they aren't interested in honouring their (previously excellent) lifetime warranty and, to be fair, I have had a good run out of this excellent piece of kit and can't really grumble. My questions then are: 1. Is this a known fault that anyone else has come across? 2. Does anyone know if it's possible to order the pump body on its own?