Hello everyone Well, i finally brokedown and ordered a midi pump for my 8R not because i was going to use it in sub freezing temperatures but because i wanted to prime the stove easily with its own fuel. Holy crap am i amazed at the difference in output,i mean "NOW extra heat please". Who said this pump is really only needed in cold weather? I've used this stove in swealtering conditions,single prime,double prime,on full blast for half an hour...you name it. It's never build this kind of pressure best $35 bucks i ever spent. Can't wait to boil test it. Oh , i have a question does the cap have a over pressure safety valve built in? Take care
In short, yes it does. When using the pump one only should pump one (1) or two (2) or perhaps in really cold conditions three (3) strokes. Any more than this and the resultant heat build up will easily over pressureize the stove and "blow" the safety valve. Then you will need to get a new cap before you can safely use the stove again. Remember 1 is good, 2 is better, 3 is dangerous. Of coarse if you are using the stove more than once without having released the pressure and there is a larger gas volume in the fount then it may be okay to pump three strokes but this is not an area where one should pump it up like one would a Coleman stove. lance
I gree with you Lance. You definatly don't need to pump it up too much,however i always thought these safety valves were meant to be reusable after they've been blown. I mean its just a spring and a small rubber pip set at a certain pressure,once that pressure is exceded the rubber pip gets pushed upwards releases pressure then sits back down once the pressure drops in the tank. Am i wrong? Take care
Did you not consider the location of the pressure release valve in relation to the location of your flame. You get much more than a release of pressure you also get some wonderfull colours in the direction the pressure release valve is pointed. And that valve is going to be hotter than all hades once you get over your excitement and find a way to shut the whopper of a stove off. The spring and pip will have overheated and will no longer have the proper tension to hold the pressures created by using the stove. My best advice, keep a spare handy. lance
I had it happen once on a 123 had a home made oven on it when she blew just a small flame not full bore i knock it into the sink.i have a way to check the pressure relieve valve most are set at 75 psi to 80 psi. A 123 runs at 15 psi when burning with the right size pot. A little more in hot weather
Hey, Guys, I very much like the Mini, and later, Midi pumps, and have several of them. When in a cold environment, my SVEA123's, and several other stoves, like the 8R, 99, 199, #10 Ranger, and Primus 71, all have a pump as standard equipment. Works like a champ, and well worth the small bit of extra weight they present. I've never had a safety valve blow on me, when using those pumps, either. As a rule, I don't count the pumps, but 3-4 seems to do the job, without much concern on my part. I also use powdered graphite to keep my pumps lubed up and ready to go. Never use oil, as it coagulates in the cold, and renders the pumps much harder to use. The Midi pumps are longer, weigh a little more, but are also easier to use, because of their extra length, and also because of a bend in their architecture. Both Mini, and Midi pumps are well worth having, and I recommend that most Stovies have at least one of each in their stove arsenals! 8) Take care, and God Bless! Every Good Wish, Doc
I lucked out -- my mini pump came with the Svea 123R/Sigg Tourist set I got on ebay a while back. What a deal! A great thing about Optimus products is that so many parts are interchangeable. Therefore, the same pump will work on any of my Sveas or 8Rs, just by switching the cap. Is that cool or what?
I have the mini and midi pumps and they both work well. To be honest the only stove I use it in are my 199's burning kerosene just to get the stove up to full power. I would take Lance's tip and just use two-four pumps on a 123 or 8 if you feel you must use the pump at all.
