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#1
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Concur - fuel to janitrol un-metered....but from memory
I have had a shadin for decades, but recall eons ago when I did have Ye Olde Original Fuel Flow meters.
As I recall, they worked by pressure, to indicate GPH. If you have a fluctuating flow into the janitrol, for example as it cycles on and off, perhaps that would induce some minor change in fuel pressure, which would show up on the original gauges as minor changes of variable fuel flow?
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David Wartofsky Potomac Airfield 10300 Glen Way Fort Washington, MD 20744 
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#2
06-09-23, 02:29 PM
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Yes, they are pressure driven. They sense the difference between the fuel system pressure and manifold pressure in my T model. So its not a direct measurement of flow. I think that a pressure fluctuation on the fuel side due to the influence of the heater is what I am seeing. Because I am running LOP, any fluctuation is noticable as a power change. If I was running ROP, I think it would be much less noticable. I have JPI unit with fuel flow meters as well. Its harder to see this kind of wobble on a digital readout. The one case where analog beats digital.
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