MORE tag doesn't work

Hello,

I have the problem that the <!– more –> tag does not work.
I think that the problem lies in this code:

<?php
$post_id = 17;
$queried_post = get_post($post_id);
?>
<h2><?php echo $queried_post->post_title; ?></h2>
<?php query_posts('p=17'); if(have_posts()) : the_post(); ?>

<?php the_content(); ?>

<?php endif; ?>

I use this code to display a specific post before the loop on a page.
The <!– more –> tag does not work in this code and in the loop, but when i delete this code it does work in the loop.

So it has to be this code, but i can’t seem to find the problem.

Any help? ??
Thx