Start with the simple things first. Open and close the drain valve a few times. If that doesn't stop it the valve will likely need to be replaced. If replacement is a major challenge you might just add a new valve on the end of the drain tube.
Chuck - Sparta, TN
2012 Jay Flight 22FB, 2 x Honda EU2000i
2013 GMC Yukon XL Denali AWD
EDUCATION is what you get when you read the fine print.....
EXPERIENCE is what you get when you don't.