Hi Kim. I wouldn't go that far!! Ha ha!! That's great you are doing a half marathon, very impressed!!
In answer to your questions, firstly I don't use a pump (although I want to). I have just moved to the US from the UK, where although I got my stuff for free (of course higher tax), I could never get a pump, as they don't give too many out, as judged to expensive. SDo still finger pricks and pens!
In the running, I basically try to keep it simple. Some form of complex carb before doing the training, whether swim, bike or run. This is often oatmeal, or brown pasta etc. I then do not inject any insulin, and whilst doing the training session, just carry a tube of glucose tablets with me, and half way through pop a couple, as I generally know I need them. Now sometimes of course, I may not - due to the weird things exercise does to a diabetic's body (adrenalin can of course affect your ability to process insulin). On the bike, I also have water bottle full of gatorade, which I sip throughout.
If you can eat whilst running, look for a cereal type bar that is relatively low sugar, but quite high carbs - this often works for me as well.
But, from what I have read, how everyone copes with exercise is all rather unique. The best thing I think is just learning as you train, and as you put more miles in, you will get a better sense of what you need to do before and during the race.
Remember as well that post exercise your blood sugar readings can go sky high, but then crash later - this is the thing I struggle with the most - and I have to stop myself form chasing.
Good luck, and I'll let you know if I discover anything more as I do the tri in just a few weeks (yikes).