Originally Posted by vintagerider
I've seen the injector contacts corroded from leaky inj boot but never pitted from intermittent contact/arcing.
Mike's 'on fire' pic shows both the 'return line' fuel connector and injector connector unplugged. He thinks they may have got that way via a prankster pressing the release levers on both those parts, but leaving them look like they are still connected. That assessment seems about the most reasonable since the connectors cannot disconnect themselves.
After a bit of riding the 'pranked' fuel line connector and fuel injector connector will separate. You've seen how easy fuel can spray from the male side of the fuel connector. That leaves the fuel injector connector.
Disconnecting the fuel injector while under power makes a healthy spark. (And gives you a 100V+ shock if powering the injectors on the test bench via alligator clips!) PLenty enough spark to ignite gasoline.
With one fuel injector disconnected, and one cylinder not getting any fuel, the catalyst runs very cool. One cylinder is simply a cool air pump, and plain air doesn't catalyze.