He checked a few lines yesterday and replaced a couple around the fuel injector area. But no start this morning. He's going to change some more tonight. He tried to test the glow plugs and relay but our ohm meter did not want to work. It does buzz, then the light goes out and you can hear a click when the glow plugs are ready (no change from when it was starting on it's own). But, we'll have to get a new ohm meter to be sure. I hope it's just an air leak somewhere, but how to find it. This is his first diesel. He will keep trying and I will keep you updated. Thank you so much!