Muffler tank pressure

[faipatrn]

The Zenoah has a pumped gas carb.  Doesn't need pressure, and doesn't work well if closed system.  If you're concerned about gas overflow, put a gas check valve in the vent line with a short piece of tubing, which you will remove when filling the tank.  When installed, it will only let air INTO the tank, and not permit gasoline to overflow.
    However, in hot temps, pressure will build in the tank, and Walbro carbs don't permit free flow when not running, so something will give someplace.
    I'd recommend just a standard open vent.

Bob P
  ----- Original Message ----- 
  From: nik.middleton at idl-bt.com 
  To: discussion at nsrca.org 
  Sent: Wednesday, September 18, 2002 7:12 AM
  Subject: Muffler tank pressure


  Hi guys,

  I'm experimenting with a plane I want to try some artistic flying with.  I'm intending fitting a Zenoah Gas engine.  My question is, what;s the best way of putting pressure on the tank, in that I want a closed system.  Do I just fit a nipple on the standard muffler?

  rgds
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