Here's a great article about insulin pumps and airport security screening: http://online.liebertpub.com/doi/pdf/10.1089/dia.2012.0220 This link will download the full text PDF of the article.
I hope this gets to the TSA. There site states: Passengers who have insulin pumps can be screened using imaging technology http://www.tsa.gov/traveler-information/passengers-diabetes Obviously it is a personal choice if you want to go against the recommendations of not using body scanners, but the reports are showing that it is not in a pump wearers best interest to go through one. TSA needs to be aware of this.
Yes, and I believe specifically they say it can void your warranty if you were to undergo a full body scan with your pump on - IMO I'd rather just be screened by hand than take that risk. Whether or not it would actually harm the pump is a moot point if the pump company would rather their pumps not go through the scanner.
I know this is older but we frequently travel to Mexico and have never had a problem. I asked the TSA to hand inspect as well as Mexican authorities and all was well. The TSA didn't really seem to know what it was where in Mexico- they barely looked at it and knew exactly what it was. It was weird. It is your right to have it hand inspected and not put through scanners.