Hello, JMendl,
We're all volunteers here and not medical professionals, so be sure to work with your pump trainer and/or endo on this topic, too.
It happens that I'm also a pumper and a long-time diabetic. I don't have a Minimed pump, but I had a similar experience with my Cozmo -- where nothing seemed to work well. In that case, I contacted their 24*7 tech support line (I'm sure MM has the same type of service) and worked thru all the trouble-shooting with them to rule out user-error, etc. I recommend that you contact them again again again -- until you get the issue resolved.
Your 'test' where no insulin comes out even when disconnected should be proof-positive that something is amiss. Do you have a local pump trainer or Certified Diabetes Educator who can work with you in person to see what's what?
I learned the hard way that we need to have a 'low tech' backup on hand at all times. That means syringes & insulin in my pump pouch. Since high BGs can interfere with one's ability to reason thru complex problem-solving and interfere with our ability to be patient and keep steady emotions, you might ask your doc/CDE for guidelines on taking a shot (of rapid-acting and/or longer acting) insulin while you're working thru the issues.
Good luck with this. Perhaps others will have ideas, too.
I have been on the Minimed pump for 8 years. The reason for the no delivery message is when your resovoir has not enough insulin in it.
I have this problem right now.. and I had it a while ago... my manufacturer sent me different infusion sets... switch to a short needle and Sure T infusion sets... i had quick set, tried shiloet, they don't work on me at all.. Sure T usually does and some times fails.... lately i lost TWO pounds five days of wanted to kill someone.. my pump still isn't working... I am trying to gain weight... ONLY my lower ab works.. all other sites never have on me *shrugs* I wish the companys would have a not for althletic, healthy, or skinny person warning... I am only five pounds from being over wieght... I stay right on the line... lose ANY WEIGHT NO DELIVERY... so right now I am upset and trying to gain weight