Yes, two futures are possible. However, the present tense form (used as future) is more colloquial: I will call you tomorrow if you will call her the day after tomorrow. (F+F) The form with two future tense forms is more emphatic, and implies asking for a promise.
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TicceIf it helps you out I will do it. (Here we can see, that "I" am not going to do anything before I find out that something has helped you out.)Not necessarily. This sentence can be taken as synonymous with the one below.
TicceIf it will help you out I will do it. (Here I feel another meaning. I see it as if I am going to do someth