chaz Posted April 20, 2023 Posted April 20, 2023 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
biggles Posted April 20, 2023 Posted April 20, 2023 G’day Chaz , the holes face forward to give a slight +be pressure to the tank …..Bob 2
skippydiesel Posted April 20, 2023 Posted April 20, 2023 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. 1
facthunter Posted April 20, 2023 Posted April 20, 2023 Running a line with fuel possibly in it the length of the fuselage would not appeal to me. Most venting is done at wing tips to be out of the way.. Nev 1
Methusala Posted April 23, 2023 Posted April 23, 2023 a friend inadvertently replaced one of his tank caps with the vent holes facing aft. Sucked a lot of fuel out on a short flight. Don't do this! 1 1
facthunter Posted April 23, 2023 Posted April 23, 2023 A pressure imbalance works much the same as flying one wing low or the ball a bit off centre.. You can actually vent fuel off in some circumstances. Nev 2
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