MSR Fuel Pumps

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Messages 1 - 7 of total 7 in this topic
giegs

climber
Tardistan
Topic Author's Original Post - Mar 26, 2013 - 06:39pm PT
Getting crews ready to head out I've had 2 of my 6 MSR fuel pumps for Dragonfly stoves come into my office "broken". After disassembling I realized both of them had the plastic threading for the fuel flow plunger assembly stripped, giving the plunger no way to move inward or outward in the housing.

I've got a call in to MSR to ask about the problem, but was wondering if you folks had some ideas. The damage itself can easily be attributed to user error; rotating the valve beyond the end of the threading, but I've seen this same issue crop up enough times to consider it a design flaw.

I might try popping one on my drill press and see if I can replace the plastic threading with a threaded tube of some sort of metal. Not sure about how much room I have to work in there or what adhesives to use, but it's not like I'm going to break it more.

Is it possible to rig an Optimus or Primus pump into the MSR stoves? Any other ideas on solutions? Hoping to avoid having to completely change out our kits as things break, but replacing the pumps with any regularity gets expensive real quick.
coastal_climber

Trad climber
north island
Mar 26, 2013 - 09:24pm PT
Why not use primus stoves? Had mine for 10 years and nothing has broken.
khanom

Trad climber
Greeley Hill
Mar 26, 2013 - 09:49pm PT
I've had this happen, the cause is exactly as you describe.

After my initial over-zealous tightening, I've gone many years with no problems. The kicker is that the pump is half (ish) the cost of the stove.


But it is a truly excellent stove and has features that no primus can match. I used it daily for years.

So there.
dave729

Trad climber
Western America
Mar 26, 2013 - 09:50pm PT
griegs - can't quite picture what's failed on your msr pump.
(and I'm looking at my msr pump right now)

what you're saying sounds real bad though. Do you mean the threads that hold said pump in the fuel bottle itself?

edit: ok. Think you said plunger when you meant to say
Pump Control Valve. Big trouble.

post an image of the shizzled piece?


mike m

Trad climber
black hills
Mar 26, 2013 - 10:41pm PT
Broke the tabs that hold the plunger in with in a few time of use, but still works. it is annoying though.
giegs

climber
Tardistan
Topic Author's Reply - Mar 27, 2013 - 02:55pm PT
Pictures of the damage. You can see the wear and what remains of the threading pretty clearly. When I cut the cross section some of the threads were detached in places.

Credit: giegs

Credit: giegs

Hope that makes more sense.
dave729

Trad climber
Western America
Mar 27, 2013 - 05:59pm PT
giegs - That looks real bad but maybe this..

Self-Tapping Brass Insert.
The wall thickness may or may not let you use one
http://www.standdragon.com/products/brass-thread-inserts-2.htm
http://www.gasgoo.com/auto-products/processing-parts-mould-302/1358011.html

Finding such an insert that will match the MSR valve threads though uh!

edit - or maybe form a sleeve of some very fine copper mesh screen and
see if MSR valve threads will force it to bite into the stripped plastic wall hard enough to act as new threads?




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