I have a 2008 250 HPDI with 195 hrs. We went to the lake today and had no issues most of the day. We pulled up to a spot and fished a little. When we got ready to go, the engine would not start. It has been flawless since I bought it a little over a year ago. It would turn over, but not start. Had fuel, oil, all fuses good, etc. Called my buddy to come tow me to the ramp. While we were on the phone, he told me to tilt the engine all the way up, let it sit a minute, then tilt it down and try to crank it. I did that and it fired right up. I went back to the ramp area and spent another couple hours fishing near by. We started, idled, and ran with no further issues. Any idea what it could have been?