Primus Omnifuel - problems...
Replies: 10 - Last Post: May 1, 2013 11:45 AM Last Post By: un_australian
Apr 27, 2013 10:01 AM
Primus Omnifuel - problems...My Primus Omnifuel has served me reasonably well but over the last year or so it has required dismantling and fiddling with frequently - if not quite with every use, close to it. Which is tedious and time consuming to say the least. And now it seems to have given up the ghost almost entirely. I can cook a meal by dismantling it two or three times and sometimes not even then.
The quality of the fuel I am using is not ideal (standard petrol from local Central American and South American petrol stations) but isn't an Omnifuel by definition supposed to be able to cope with a variety of fuels? I filter the fuel I use through a doubled up piece of silk cut from a sleeping bag liner so no really big bits of gunk are getting into the works.
Even when the thing does burn at all the flame is kind of gusty and uneven and often now it simply goes out after a while. Or I can't get it to light at all. (The fuel oozes slowly out when I open the valve to release the fuel to preheat it.)
So do these stoves just have a life span or mine has reached the end of it? Or should it last more or less indefinitely with appropriate servicing? And what kind of servicing would that be?
Apr 27, 2013 10:05 AM
No. Multifuel stoves allow you to use unleaded petrol in emergencies, but they cannot handle everyday use without frequent cleaning or worse. The instruction manual of my MSR Whisperlite International, for instance, warns that use of unleaded petrol will shorten the lifespan of the stove.
Coleman fuel and kerosene are more commonly available than you might expect. Treat unleaded petrol as a last resort.
Apr 27, 2013 10:35 AM
2Anabase, Coleman fuel and kerosene are not commonly available in small villages in remote places in Central America and South America. I have not found Coleman fuel/white gas since I left the USA. And believe me, I have looked.
I don't think that Primus and/or MSR can realistically market their stoves as omnifuel if they don't burn commonly available fuels. Just about every long haul long distance cyclist I know use gasoline in their stoves - there just isn't a widely available viable alternative.
Edited by: un_australian
Apr 27, 2013 7:58 PM
Apr 29, 2013 1:22 AM
I had a problem of very similar description in South America, and eventually discovered a bit of sticky goo inside the jet. I scraped it out with a sharpened stick and the stove worked fine thereafter. I did find the stove didn't burn very well using dirty Bolivian petrol at 4000m, though it recovered its function when I got back into Chile. But, as I noted in the toher thread, the cheap petrol caused corrosion damage, and I had to through it away eventually before it became dangerous.
This is assuming you are maintaining pressure in the fuel bottle. I got similar symptoms when a fuel pump was failing, but it was obviously the pump because the pressure was not maintained.
If you have an inline fuel filter, these can become clogged. Take it out and see if the fuel comes through more easily. They aren't really essential, especially if you are filtering the fuel on the way in.
Apr 29, 2013 10:12 AM
Apr 30, 2013 9:25 AM
Apr 30, 2013 9:39 AM
Apr 30, 2013 9:41 AM
Apr 30, 2013 2:03 PM
May 1, 2013 11:43 AM
10Ivie, I pried the internal filters out and the stove functions now so I figure that is the main problem. I think a thorough clean and replacing all filters and o-rings should see considerably improved performance.
pbekkerh, yes, for free. Nice of them. I'm impressed and 100% mollified because I like the stove and think that that's pretty good customer service.
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