My most important tips for running with T1 are: have your test kit with you at all times (get some shorts with pockets or some sort of belt system if necessary), carry a bunch of sugar with you, test at least every half hour (or less, if you are more comfortable), exercise with someone or tell someone that you are exercising and make sure they know what to do in an emergency, and carry a phone + med alert information.
My system is (just a personal experience):
I run 6 days a week, 6 to 12 miles a day. I run during the afternoon (2:45-5 pm). At lunch (12:30) I bolus 1/2 my insulin. I check my sugar at 1:45 and then again at 2:40, this establishes a pattern so I know if I need something to eat or not. I am usually between 180 - 230 just before running I turn my pump down to 0% basal rate. I test every 25 minutes and eat glucose tabs if I am dropping. When I am done running I bolus for the tabs I ate while running and 1/3 of my basal I missed. I am usually around 160 mg/dl at 5:45 when I eat dinner, but drop slowly until bed time. I also check my sugar at 2:30 am every night so I can catch my lows.
This system is not perfect and there are days when my control is way off. I make sure to have my test kit, 3 glucose tab tubes of 10 tabs each and two frostings for emergencies with me at all times.
I did not get this system to a degree of control I like until I ran every day for about 7 months, by then my body had adjusted and was somewhat predictable.
Get the book, DIabetic Athlete's Handbook, by Sheri Colberg. Read it.
Best of luck