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Outdoor Retailer: Primus Liquid Fuel Pump

When shut off, many liquid fuel stoves retain a little fuel in the hose that connects the fuel bottle to the burner assembly. Sometimes, this leads to fouling of the hose, and the deposits of impurities could interrupt the flow of fuel. More often, it simply oozes a little fuel when disassembled.

Primus ExpressLander in off position.
Scott Kaier shows off the Primus ExpressLander.

It's not a serious loss, but for those who don't like unneeded contact with explosive solvents, it's not ideal.

Primus has a simple solution to this common issue. Scott Kaier showed it to us on the ExpressLander stove, new for spring 2011.

The intake hose on the ExpressLander's fuel is angled and its pump is labeled "on" on one side and "off" on the other.

When your stove is turned off, flip the fuel pump upside down to the "off" labeled position. The intake hose will be angled upward and above the level of the liquid fuel in the bottle, “flushing out” and burning off the fuel in the line. When the stove is on, flip the pump over to "on" and the intake hose will be angled down toward the bottom of the fuel bottle.

The concept is simple and non-gimicky. Check it out for yourself in the video below.

Primus ExpressLander Specs

  • New for spring 2011
  • Weight: 6.2 oz
  • Dimensions: Folds down to 3.25" x 2"
  • Output: 5,200 BTUs per hour
  • Boil time: Boils a liter of water in about 4.5 minutes
  • MSRP: $96


Leave it to Primus. Great design. Anyone know if I can retrofit my my isobutane version of this stove with the liquid fuel components for cold winter backcountry trips? I'd like to not have two of the same stoves. They look the same (the stove part), but I don't recall if there are differences in the internals?

My Optimus Nova has this feature, and I bought it years ago. I'm not knocking it at all, I just thought it was pertinent that it isn't a new idea.

XterroBrando, here's Scott Kaier's answer to your question regarding retrofitting:

It's doubtful you'd be able to retro fit this pump to work with a canister gas stove.  With different burners and fuel jets designed to work with specific types of fuels, I'm guessing it would be a difficult switch.  And since you're working with flammable gasses, trying to do so could be dangerous.

Gonzan, thanks for pointing that out. You're right that it's not exclusive or new technology, but I hope it's an interesting point about stove design for some readers to learn about and discuss.

We always solved the problem of residual gas in the fuel line by simply breaking the seal between the the fuel tank and pump, raising the burner above the fuel tank, open the stove fuel valve, then let gravity empty the contents of the fuel line back into the fuel tank.  This works with every liquid fueled stove I have ever used. 


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