Bleeding off fuel pressure just sitting? Not to get all Techno-Crazy and start picking the idea apart, but I don't think it is a "returnless" fuel system. It should all bleed off from the fuel rail back to the tank... unless they (the injectors) were SERIOUSLY leaky. At which point, I don't think it would run right at all, ******* fuel into the cylinders all the time, especially under pressure.
Just see things my way. It was unburned fuel pumped in there while cranking, under the enrichment circuit and when it finally fired, it burned off, with a little black smoke.
If it is not running "rich" and puking black smoke now, my theory is supported.
Now surrender peacefully, with honor, so I can go to bed feeling the fuzzy high that comes as the spoils of victory as I demonstrate my ability to dispense endless amounts of incredibly useful internet mechanical banter.
I shall spare your women and children. Perhaps I will not salt your fields, nor destroy your stone temples, as I am in a kind and generous mood.
Make it so, as it may not last and I will have to roll up the sleeves on my SpongeBob Pajama jumpsuit and really go to task on schooling the minions on the art of modern day (actually two decade old) automated fuel delivery system dynamics.
