Thanks, Phil.

Get a maintenance kit, disassemble the pump, replace the o-ring and lube it all up. You might have some sort of crud in there, but it sounds like simple deferred maintenance is the likely culprit.

Follow this link. When you get to the page, right next to the product description it says "MSR pump maintenance"- click on it and it will give you a full video tutorial on how to do it.

http://cascadedesigns.com/msr/stoves/stove-accessories/msr-fuel-pumps/product

Have no fear, the new MSR fuel pump will work even better on your older stove, especially simmering. Select the all red one. It is Dragonfly specific. You should also consider purchasing the maintenance kit @ the same time if you don't already have one. It contains all the necessary parts you'll need over time to keep your stove running to optimum performance.

Select the Dragonfly specific maintenance kit:

http://www.backcountry.com/msr-expedition-service-kits

I've used a WL for years. I think the problem you're referring to is a flaw in this new design: The valve control is now that long affair that folds down, instead of the old thumbscrew. As a result, when it's folded, it acts as a lever arm and normal bumping around in a pack can cause the valve to open slightly. Bad news! Especially because there is no fix available. The best you can do is be sure to close it tightly, and then pack it so that the valve is reasonably protected.

Everything else about the new design is good. This control arm thing, however, was a mistake.

Thx Jeff, you are helpful.
yes i can't find that specific o ring too.
I think I will try to apply some oil on the o ring first
and if the gas continue to leak I will contact cascade designs or just buy a new one.
Thank you.

Copperhead,
I just took mine apart again for general maintenance & to better see what problems you might be having.
1. Using a 7/16 open-end wrench, carefully unscrew the brass valve housing.
2. Unscrew the needle valve assembly.
3. Inspect & lubricate the small red o-ring. Use MSR Pump Cup Oil to lubricate or if you don't have that, use a small amount of petroleum jelly & wipe away any excess.
4. I couldn't find that specific o-ring in either maintenance kit so if it does need to be replaced, contact Cascade Designs @ 1-800-531-9531, explain your situation precisely, & I'm sure they will send you the part you need.
5. Carefully reassemble the valve.
6. Also replace the fuel tube o-ring on the opposite side of the pump @ the same time. This o-ring is included in both maintenance kits & is the most prone to needing replacement since it does have direct contact with fuel.

I hope this helps.

I gotta give Monte Dodge credit for the photo, but I figured you would get a kick out of it...and laughed myself when I thought back on it. The perfect stove for people who like to play with fire. I'm surprised a stove aficionado like you parted with it. I'm wondering if Tim only melted the pump recently, or if he was going through the attic and decided to see if he could salvage that old stove that he flamed out during the first week he owned it? External frame backpacks with huge sooty aluminum pots hanging from them, Sierra cups, wool mid layers, legally hanging food in bear country...and still managing to survive for all these years.

Phil, Great picture. Remember the little clip on the fuel pump that propped the bottle up so it would draw fuel from the bottom? I sold mine on eBay in 2007 as a COLLECTOR'S ITEM ONLY. NOT INTENDED TO BE USED AS A WORKING STOVE!!!

I'm not a betting person but I'd bet most "Gear Guru's" don't remember the MSR Firefly.

A little history on the firefly. It was first introduced in 1983 with a clear plastic fuel tube which was quickly recalled for obvious reasons. The replacement was the black mesh fuel line which was the same one used on the original WhisperLite. Shortly thereafter, the Firefly was no longer produced. The one's that are still being used are accident's waiting to happen due to fuel leaks similar to what happened to yours. Three years ago I spoke to to MSR regarding this exact subject. They informed the Firefly should not be retrofitted/updated for any reason whatsoever & there was also an upgrade credit available. Like I previously mentioned, this was three years ago & I don't know if this is still an option. It is best to call them directly & explain your situation. The folks @ Cascade Designs are very fair & understanding & I'm sure they will will be happy to work with you.

Please give us an update on your situation. Good luck.

If you send MSR what's left of your old yellow pump that came with the Firefly, they'll give you a discount on a new one. Call them to set up the details- 800-531-9531

I have the same issue - the stove held up for a number of years but I think it cracked during a move. It is now leaking fuel and this is a dangerous situation.

The pump listed looks identical and I plan to purchase one for my dragonfly stove.

Best of luck with your stove

I would highly encourage you to contact Cascade Designs Customer Service Department first @ 1-800-531-9531 & explain your situation before purchasing a new pump. Under normal usage, your pump should not have cracked. I have an old black & gray pump from 1988 for my original WhisperLite that still works fine & isn't cracked. The people @ Cascade Designs are very understandable & easy to work with.

Absolutely! I would highly encourage purchasing the DragonFly specific pump especially if you see any indications of cracks or leaking. Because you are dealing with fire and volatile fuel, replacing the pump will be in your best interest. The new pump is much more durable and includes a new windscreen as well. This is a very wise purchase indeed:)!

No it won't. The reason is the pump the Whisperlite International uses doesn't have an emergency shutoff valve due to the extra flame adjustment valve located on the DragonFly stove. Because of the DragonFly's simmering capability, MSR felt it necessary to design an emergency shut-off valve into the DragonFly's pump. This is why there are two pumps (Standard Pump which will work on all MSR's liquid fuel stoves (Whisperlite, Whisperlite International, Simmerlite, and XGK EX) and the DragonFly Pump).

If you try to use a standard pump with a DragonFly, you will find the fuel line will not fit into the hole required by the DragonFly's fuel line. Visa versa, the Whisperlite International (and all other MSR liquid fuel stoves) won't work with the DragonFly's pump because of the too-large hole which only fits the DragonFly's fuel line.

Nostalgia isn't worth the hassle...get a Dragonfly, they rock.

If I were you, I'd pop for a new white gas stove. The Whisperlite is still an excellent option, but, like phil said, once you purchase the repair kit and a new pump, you've basically spend as much as you would on a new stove of the same type. Purchasing a canister stove is always an option too, but I like having a white gas one as a primary; over time, it will cost you a lot less than a canister stove of properly maintained (taking the cost of repeated canister purchases into account vs. filling your white gas bottle).

There are some compelling reasons why you would want to buy the new pump, but it isn't necessary. If the old pump is working then there's really no need to replace it. I would give the old pump a thorough inspection most especially looking at the O-rings (the big O-ring where the pump screws into the fuel bottle is the most critical). If you see any cracking of the rubber or any cracks on the pump itself I would replace it. This is not a warranty issue since it's most likely due to normal use. If you suspect it is a warranty issue, call Cascade Designs at (800) 505-9500 and they will issue you a Return Authorization Number. You will need to send it back and, after they inspect it, determine that it isn't a warranty issue then they will repair it for a reasonable fee. They can help you over the phone if you have specific questions...

The new pump will allow you to simmer better (not like a canister stove, but gives you one full rotation of adjustment vs. the old pump that gives you no rotation adjustment). It's also much more durable, won't spray fuel when you release the pressure after unscrewing it, and is much easier to maintain (no leather plunger). It also comes with a new windscreen which is a $10 value.

My opinion is the $35 for the new pump is money well spent and will upgrade your stove to the latest version of the Whisperlite. The most resent updates to the Whisperlite have to do entirely with the pump, not the stove.

I got my whisperlite int'l 2 years ago and it has this pump in it. Perhaps your stove is older? Either way, unless there is something wrong with it, I don't think you need to replace. I don't think MSR will do it for you either, especially if the one you have now works. Look at the Q & A below this for the advantages of the new pump.

I would recommend getting a new pump. If anything is broken on the original pump it should be considered unserviceable and discarded. The reason is you are dealing with a very volatile fuel (white gas) and fire. If any of the fuel leaks out or the pump doesn't seal properly to the stove, you risk having the whole thing light up like a Christmas tree. I've seen it and it's not pretty. There are some neat advantages in getting the new pump anyway. For one, it's more durable. Two, it gives you better simmering capability, and three, it comes with a brand new windscreen. It's well worth the money and will update your Whisperlite significantly. It is one of the few upgrades that is strongly recommended. The Standard Pump is what you want...

Before you start replacing parts or the entire pump, apply a small amount of petroleum jelly on the pump leather. This is the part on the end of the plunger that actually forces air in to the fuel bottle. Work the pj in, remove any excess, then pump until you get the air flowing again. The next step would be to replace the rubber o-ring where the plunger seals @ the fuel bottle. This part normally doesn't need to be replaced unless it becomes brittle or cracked.

The best thing to do would be to take your stove to a store that sell MSR products & see if the pump is interchangeable. Take along your empty fuel bottle to make sure the threads are also compatible.

What I believe you're seeing and referring to in the picture is not the fuel intake but the check valve. If you look closely, you will see a part of the fuel uptake tube on the left (more visible on the Dragonfly pump pic). This flexible line rests on the bottom of the fuel bottle, regardless of MSR fuel bottle size, when aligned for stove use. Because of this setup, less than 1/2tsp of fuel remains unused, at least in my experience, and I am neither careful nor particularly conscientious of the fuel bottle's placement on the ground.

It will. Just choose the Dragonfly pump in 'Select options'.

I've never had a problem with it and use it all the time. Figure out where it's leaking from and check that that part's secure, and you might want to just pony up for a new one. Leaking fuel is not a risk worth $35.

Here's three links to the information you're looking for:http://www.backcountry.com/store/CAS0376/MSR-Fuel-Pump.htmlhttp://sales.liveperson.net/hc/s-9551721/cmd/kbresource/kb-6338232607920599444/view_question!PAGETYPE?sf=101133&documentid=239532&action=view&VisitorProfile=BCS&MESSAGEVAR!home=no&MESSAGEVAR!cookie=nohttp://sales.liveperson.net/hc/s-9551721/cmd/kbresource/kb-4986987583145535645/view_question!PAGETYPE?sf=101133&documentid=239589&;action=view&VisitorProfile=BCS&MESSAGEVAR!home=no&MESSAGEVAR!cookie=no

This pump works by pumping air in, not fuel out. Since air or gaseous fuel is much more compressible than liquid fuel, it will take longer to pressurize the emptier it gets. Seems like filling the fuel back up would tell you whether that was the problem, otherwise it's probably broken. Make sure it's screwed on right too. You will also want to be sure that the internal fuel cup in the pump is lubricated - pull it apart and put a bit of oil or spit on it to make sure it's making a good seal.

First Class Mail International Package costs $9.85. Priority Mail costs $49.95. This is based on a one pound package.Here's the USPS website page as of 9/13/2008:http://ircalc.usps.gov/IntlMailServices.aspx?Country=10211&M=2&P=1&O=0&sd=1