pet snake pukes up everything i feed it.?

Either your husbandry is incorrect or the snake is stressed.    Do you handle the snake after he eats?  Is there children or other pets in the home that are harassing the vivarium after he eats?  Snakes are vulnerable and sluggish when digesting, so they will regurgitate if they feel threatened or harassed.

Also possible you are feeding too often, or too large of prey.     Or if you are feeding multiple prey items at a time, you are feeding too much, or may need to go with bigger prey instead of multiple small prey.

You don't mention the specie, size of your snake, size of your prey items or how often you are feeding.

Call a vivarium store for advice, or check youtube for help? 

Sounds like a blockage. Time for an X-ray.