# Bad Cartridge with Tandem? **URL:** \ **Category:** Pump\ **Created:** [September 27, 2025, 10:59pm UTC](https://forum.fudiabetes.org/t/bad-cartridge-with-tandem/15471 "2025-09-27T22:59:27Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![cogdog](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/cogdog/32/5436_2.png) [@cogdog](https://forum.fudiabetes.org/u/cogdog)\ **Post date:** [September 27, 2025, 10:59pm UTC](https://forum.fudiabetes.org/t/bad-cartridge-with-tandem/15471/1 "2025-09-27T22:59:27Z")
First time happening with my Tandem pump. It was time for the change, and when I did the fill, it pushed out like 18 units and no signs of drops at the end. I dis-assembled the parts of the Tru-Steel infusion and saw no drops. I tossed the cartridge and did a new one and everything worked as it should. Just wondering if anyone else has had this? I am not sure what would cause a cartridge not to pump. I was just glad it was not a pump problem as I am camping! Just for fun, this is our spot. ![IMG_7028](https://canada1.discourse-cdn.com/flex030/uploads/fudiabetes/original/2X/e/e859b14c5eaf32fc8924f3cee21679beafe39812.jpeg) ---
**Author:** ![jim26](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/jim26/32/9780_2.png) [@jim26](https://forum.fudiabetes.org/u/jim26)\ **Post date:** [September 28, 2025, 6:50pm UTC](https://forum.fudiabetes.org/t/bad-cartridge-with-tandem/15471/2 "2025-09-28T18:50:22Z")
I haven’t had that specific issue, but I do struggle sometimes getting the needle to fill the cartridge. It seems to plug when inserted into the cartridge and I can’t get the syringe plunger to push down. Usually I can eventually get it to fill the cartridge but sometimes have to resort to using a new syringe. Frustrating… ---
**Author:** ![cogdog](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/cogdog/32/5436_2.png) [@cogdog](https://forum.fudiabetes.org/u/cogdog)\ **Post date:** [September 28, 2025, 8:56pm UTC](https://forum.fudiabetes.org/t/bad-cartridge-with-tandem/15471/3 "2025-09-28T20:56:42Z")
Yeah I have had that, it seems like there’s a magic spot on the tiny white bulb (makes me wonder how challenging it would be for someone without sharp vision). I have had a clogged syringe. I keep a few used ones as spares/backups, ---
**Author:** ![RachelMaraii](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/rachelmaraii/32/12439_2.png) [@RachelMaraii](https://forum.fudiabetes.org/u/RachelMaraii)\ **Post date:** [October 3, 2025, 7:57pm UTC](https://forum.fudiabetes.org/t/bad-cartridge-with-tandem/15471/4 "2025-10-03T19:57:37Z")
I had this happen!! I can’t remember if I reported it to Tandem… but I’ve never seen it since, just the one time.