Hook SF presave no active

Hello!

i'm doing one verification in the object of salesforce that allow know if one record exist, if one record exists in SF this record is updated in SF and is created in Drupal.
But the hook that allows this no it work. I was doing a simple test, but was no succesful.

CODE:

function verify_user_salesforce_pull_entity_presave($entity, $sf_object, $sf_mapping) {
{
dpm($entity);
}

Does anyone have a solution?
Does anyone know why it is not activated?

Attached of my module for verify users existing in SF.

Thanks.