Tummy tuck incision leaking? Surgeon says not to worry but I am.

Hello. Great question. You mention your surgeon determined the incision is not opening and no infection nor seroma is present. I will suggest following his post op instructions. Good luck with your recovery.

Wound is leaking?I’m sorry to hear about your wound healing problems. If you feel that you must get a second opinion from another surgeon, perhaps this would be a good way to find out what’s going on with your wound. One possibility is that you’re having a spitting suture. However, I simply could not tell online what exactly is going on. Therefore I suggest a physical examination for a second opinion.

Usually, leaking with that significant amount should be a concern. A second opinion is always a choice. If you are still experiencing wound drainage at this point in time, you must already have developed a seroma. Schedule an appointment with your surgeon or with another for an examination. 

Hi and welcome to our forum!
While there may be areas of slight healing delay responsible for small amounts of drainage, wound leakage sufficient to saturate bandages, clothing, and bedsheets is excessive. The presence of a clear or serous (yellow tinged) fluid suggests a seroma, perhaps too small to be palpated. Often, an ultrasound study is required to locate these collections.
Maintain close followup with your plastic surgeon. 
Best wishes...