Also, MOGAS (which is what I use) is more susceptible to vapor lock than 100LL due to lower boiling point.
At 1,400 hrs. the only 'engine failure' I've had was similar to Jonas': it quit on rotation on a gravel bar on April Fool's Day! Fortunately, the wheels were still on the ground with plenty of overrun left.
After that trip, I took apart the return line and inspected the orifice, check valve, and the entire fuel system. All AOK. I ass-umed vapor lock...
Thanks to all for the ways to inhibit vapor lock!