Re: needle tank vent, open or closed during operation?
The tank on that model is much too small. You should upgrade to a plastic fuel cell for an airplane or heli. Much easier to see the oil level & a higher oil volume will reduce foaming & the chance of the supply line sucking air b/c your model is at an awkward angle. And if you go with a new tank, increase the supply line & fittings to atleast 6mm so the oil will flow more freely to the pump.
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