"Fuel Flow and Level Sensors" Configuration

“Fuel Flow and Level Sensors” Configuration.
Hello to everyone. I apologize in advance for any translation errors. I couldn’t set “Fuel Flow” for “Agriculture Drone”.
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I adjusted the parameters according to the relevant page. “Battery Monitor 2” for 10lt tank. The settings I made are available in the pictures. (https://ardupilot.org/copter/docs/common-fuel-sensors.html)
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When I run the spray system, there is no movement/change in “Battery Monitor 2”. .
It keeps giving “Battery 2 Low Falsafe” error.
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But I don’t have any information about what’s next. I’ve gone through all the threads I could find here. But I could not find clear information until the end.
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I would be very happy if experienced friends can explain in detail. It will benefit everyone.
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I’m looking for help from people with experience. I still haven’t fixed it.

Did you try setting BATT2_AMP_PERVLT to the number of mL per pulse (rather than the 17 specified in the parameter documentation and in your screenshot)? I’m working on one of these, too.