After driving about 60 miles today I got home and left my truck idling by my shop longer than anticipated, about 10 minutes, shut it down then tried to restart about 30 minutes later, no go. It was about 90° out. Tried several times over a ten minute period, nothing. Fuel pressure gauge was showing 22 psi while cranking, so it was getting fuel. I finally took a compressed air line and blew on the injection pump for a minute, it started right up and ran fine. Any ideas?