Thanks guys

It's not running away. That one time the accelerator stopped working and the engine was revving, he was able to shut off the engine with the key. Also, that problem went away and then came back in the opposite way - no way to Rev.

Now the accelerator seems to work. He spent some time cleaning something in the IP, I don't know what.

This weekend we're going to flush the tank.

The filter is new, and full of fresh diesel as it was drawing from a Jerry can.