Poster Comment:
My buddy's longhorn Pete, one and a half million miles, has a Caterpillar 3406E (I don't know the difference, but it's probably about the same, just a rev. dash.) I used to do a lot of work for him, mostly chassis electrical. I'm not really geared up for heavy mechanical, nor will my back let me do much anymore. I found the problem interesting, if not a one in a million.
If you're not interested in a degree in Diesel Technology, skip ahead to 9:00. A little gross.
With fall coming, my garage is having the same trouble. I saw one the other day, stomped it, and it still managed to scamper away.