Hi - new to forum, I wanted to share some info about my experiences with a pair of Primus Omnifuel Stoves I have been running on petrol (Gasolene for US). They have both suffered the same highly dangerous failure hence the title of this post. Usually in dismal weather when you really need Coffee Now! = Now! and the wind is so bad that the likes of Coleman Sportsters just won't stay lit, the seals on the fuel line fail and spew out Gas ready for a super fireball. The last occurrence of this included the seal on the tank fuel control valve as well so Gas was coming out pretty much everywhere. My first experience of this, on a camping trip, the Omnifuel was the only stove I had and there was nowhere to buy spares. Instead I bought another complete stove resolving to fix the other one at some point - then I would have two! SWMBO did not mind buying a new stove in the interest of hot coffee - neat trick. Best I could do with the repair of #1 was to buy a complete fuel line/Valve assembly. I was told the parts are not available - mmm maybe Y/N.... Anyway - not cheap but quick and easy. This time on #2 I was not going to part with that kind of money again - I was going to fix the old one no matter what. Looked at the spares section of Primus website, a complete service kit was the only offering. It contained all sorts of bits I was never going to need. Also it was not far short of the price paid for the fuel line+tap 7yrs ago. No,I wasn't going that way. Fixing the Control Valve seemed easiest to tackle first. It needs an adjustable spanner since the nut is 8.5mm AF - it maybe some exact imperial size but I had nothing to fit. The spanner needs thin jaws otherwise they won't fit under the head of the control valve - mine is 5.5mm - about the max. Once the nut is undone the control valve screws out and the rubber sealing washer at the base was obviously very flat and very hard. Here's the trouble - not sealing. Getting the fuel line out of the valve head is harder work. It's held in by soft copper wire that jams in a slot. I could find no better way than brute forcing it by levering on both sides (to maintain steady perpendicular force on the nipple) Eventually the wire is forced out of the slot and the thing comes out. The rubber sealing washer on the base was in exactly the same state as the one on the control valve. Now to find some O rings to replace them. Nothing in the usual box of mixed rubber O rings as available on ebay etc. I tried cutting and joining one with superglue - no good. Base Camp UK - my usual source of stove bits - lists what I think is the right part but I know I will have to wait a week or so to get them there. I want this fixed now! Research on Internet says Nitrile rubber is OK with Petrol etc. Thats good because most stock O rings are made of that. Presumably if that is what Primus originally used it doesn't last forever but if I have plenty of spares why should I care? I ordered some 1.6mm thick and 2.75mm inside diameter from an online supplier and they turned up next day. Fitted to control valve and re-assembled with a little silicone grease for lubrication - perfect. Fitted to fuel line and it felt like the seal would be OK - not quite as tight and positive as the control valve but hopefully gas tight. Now some means of latching home the fuel line without the copper wire, and at the same time making something that can be disconnected a little more easily for next time - probably in howling wind + rain. Needs a "C" clip of spring steel just the right diameter - of course I don't have any.... What I do have are guitar strings - hehehe Take a 5th A string (wound) and cut a bit off the end. Form it into an almost closed C of the required diameter - presto - hose locks home! Give it a firm tug and it comes out again. Might prefer if that tug needed to be even a bit harder than it is now but short of dropping a full fuel bottle while holding the stove it will never get tugged hard enough to come out - this is definitely worth trying out. Pump up tank - turn on valves - no leaks! Fire up stove make coffee. Think about something else for a better C clip while drinking the coffee. Something will turn up and I will know it when I see it. Hope this post will be useful to someone since looks like you will probably need to know about this sometime with an Omnifuel. My pair have not been heavily used and are always stored in normal indoor conditions. This is not a question of wear - simply seems 7yrs is about the age this happens. I now have a good stock of the O rings some of which are going into the bits pouch along with Nozzles Multi tool etc.