Just don't resurrect a 10 year old post because it resembles your issue. (LOL)
Reference it, but don't add to it.
Steve is pretty busy with IBEW school, so sometimes I jump in to offer assistance, if it's something I've had experience with.
I have found that some of the replacement pumps don't have an anti-siphon valve. Only one FPR has it, Kirban. Without the anti-siphon valve, hot starts are difficult, resembling a flooded condition.
Remember, the only fuel item that Megasquirt monitors & controls are the injectors.