F1 Kamoer

I’m having trouble getting the dosser to work. I’ve downloaded the app calibrated it to 40 seconds per 2 mL. I have a long ways to go for the nutrients to get to the tank. I added the schedule for 2 mL to come on at XX time and it pulls the 2 mL out plus some and then immediately stops so I’m not sure what the issue is. It’s not running for the 40 seconds that it needs to please help.