GTSSportCoupe
2LTE abuser
I was thinking about something Nick. I bet you are spot on that my issue is fuel related.
If the truck sits overnight, it starts hard and smoky. If I kill it and restart within a few minutes, it fires immediately. If I let it sit for a couple of hours but the engine is still warm it takes it a second longer to catch. No smoke and roughness, but a bit slower to catch.
It makes sense if I have a small amount of air getting in through a hose or the primer pump. It get's progressively worse the longer the truck sits because more air is allowed into the system. It's never enough to make it not crank and really is only blatantly obvious on a cold start.
I drove the truck a lot today and shut if off for various amounts of time throughout the day. Starting speed is related to how long it was shut down ,I think, now that I was really paying attention to each start to see how it behaved.
I agree that it's a very high chance it's fuel related. The big clue for me was that glowing longer made no difference, however I think you observations about it getting worse when sitting longer are likely correct. As the vane pump in the front of the injection pump draws in fuel when the engine is running, it's also sucking air in where ever the leak is (probably primer pump). When the truck sits, that air which is probably mixed in pretty good in the fuel will rise and turn into larger bubbles (in injection lines). This will cause the worst issues on start up.