How do you get the dang things to seat all the way?

I figure I'm causing a ton of air intrusion with this.

 

Vaseline and even pressure.. Listen for the snap when they seat.

 

Add to that a bit of rotation, but the real key is the Vaseline. Otherwise you'll tear up the o-rings and be back at Step 1.

Mike

 

Thanks guys I'll do that. I got a few caps on without much. But the others didn't want to go so i didn't force them. I figured they would be okay but obviously not.

It just hit me why my truck was having such a problem starting. Its the dang caps...