"I'm going; I will tell you everything when I come back."

Translation: J'y vais, je te raconte tout quand je reviens.

[LSadun]

How can you tell when tout comes before a verb and when it comes after? Why is "eat everything" tout manger, but "tell everything" is raconter tout?

[Octavianqin]

Should be "raconterai" instead of "raconte"!

[LSadun]

No, it's correct as written. Both French and English sometimes use the present tense to describe the near future, as in "when I come back". In this case, French does it in the first half of the sentence, too.

[Octavianqin]

At least the future time should be accepted, here it accepts only the present time.