Continuing the discussion from Ramadan is coming!:
Try to view this as a wonderful opportunity to test your basal rates. In terms of general advice, are you familiar with what are sorta the "standard" advice books: John Walsh's "Pumping Insulin" and Gary Scheiner's "Think Like a Pancreas" ?
Other than to test my basal rates, I've never really fasted so I'm winging this based on what seems reasonable to me. Hopefully some other folks will also offer suggestions.
If your basals are currently a good match to maintain your BG at whatever your normal physical activity level (i.e. exercise) is during Ramadan, then you should have no problem. Your BG will stay flat.
If instead your BG starts to rise or fall, maybe see if this happens consistently. If it does, then your basal rate probably needs adjusting. If your BG starts to trend down you can always set a reduced temp basal rate to allow it to naturally rise again.
Lately I've been playing with "turning off" my pump by setting a temp basal of 0% for 1/2 to 1 hour. My feeling is that the advantage of using a temp basal versus suspending your pump is you won't forget to turn it back on again. When the temp basal period expires the pump just resumes your normal basal rate for that time of day.
Of course, all this depends on how sensitive you might be to insulin, exercise, or whatever, of course. What sort of settings do you currently use in your pump?
Glancing at your other posts, It appears you use an Animas Vibe and the Dexcom G4. Have I got that right?
BTW, welcome to TuDiabetes. I hope the problems the new site has been experiencing did not make the registration process too painful for you. Early days for the new site and all that …