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J160c Fuel cap and vent tube


chaz

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The vent tube has become loose on one of my fuel caps.......the manual states that it is fastened with loctite 620 which I will redo.

Question... which way are the vertical row of holes in the vent tube meant to face...forward or back ?.  

The manual suggests that they face the roll-pin locater  on the cap, which in my Jab is to the rear ? 

thanks guys Chas Qld

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No expert on Jab's  - while you defiantly don't want to induce a vacuum on the tank, the level of positive pressure, developed by a pitot tube sized breather, facing into wind, will have little benefit. A static pressure breather is just as good.

 

On most small aircraft, the vertical fin presents the highest relative point, it is here that the breather should be located/terminated, removing almost all concerns about venting fuel overboard when parked/refueling on a slope or making fast ground manoeuvres. It also allows for volatile fumes to exit well away from the engine/refueling points minimising any chance of ignition.

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