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western manitoba | I had the same syphoning issue in canola 3 years ago on my middle two manifolds where the shortest primary hoses are. Especially the one inside manifold with an extra outlet.
I took off the 6 foot long primary hoses on these manifolds on the drill, and put on 15 foot long primary hoses and looped them around. Problem solved for me ever since.
I believe what happens is that the hoses for the inside manifolds run at a slightly lower pressure (due to their shorter length to the openers) than the hoses for the farther away manifolds. Also manifolds with more outlets run at a lower pressure than manifolds with less outlets. Either way, there is enough difference that there always is a little bit of air wanting to flow from the pressurized tank, through the meter, and into the manifolds with least resistance.
It is only in small seeded crops and higher fan speeds that it affects product flow through the meter.
You should try to get your primary hoses closest to the same length as possible and practical, slow down your fan speed, and deflect as much air as possible away from the seed manifolds.
Edited by stockton 5/13/2015 19:40
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metering issues on a 1910 JD air cart
