Hi there,

I have been looking over the posts as they have come in. You have gotten some of the best buzzards sniffing around with you on your dead car. Most of these buzzards have nice long gray feathers of experience and will keep circling lower and lower until YOU find the problem.
Short of using Face Time and phones, it's the best we can do. Sorry!

There is one thing about working on these cars, is that, there can be several little animals in the area that will lie still as if they are dead while hiding and will only move if they can get away with it, i.e. Intermittents

A buzzard will only land if it's pretty sure the animal is dead with stink rising. It is as close as he can work but for a hawk it goes in for a kill.
A few of our posters are hawks, especially when working on familiar hunting lands i.e, their own cars. They have gotten in there and have torn their cars apart from head to tail. Some are Proud Hunters and will provide pictures as proof on here.

That said, your car is "open territory" as we do not know the maintenance condition of your car.
These posts seem to be "floating around" more so about fuel pressure/ delivery issues than the electrical portion of the computer stuff within the fuel management system. Luckily youhave been able to exchange parts with the other car, so on the cheap, that is a great help.

You have not changed over the FRP and that little animal can do a "wiggle in the weeds" just like a "old" fuel pump or power connections to the pumps. The main pump is exposed to lots of grime under the car and I have found them to come loose internally.

I am still trying to keep "turning on the headlights" as a current draw that dropped the systems voltage across a bad connection. It is something that you appear to firmly believe in and started the issue. I tend to be a buzzard and will sniff around checking the cleanliness fuses as they are very good possible "bad connectors." It is a beginning point if the added load caused an issue. I like listening to owners as most of time they know their car sounds have different moments. No one knows after its gone south or dies randomly that the one instance could have been a clue.

I ask myself questions in relation to sequences of what I expect the car to do. Like when I start the engine I expect it to race up and back down to idle every time. If not maybe the IAC is sticky or not working as in bad!

A little more detail on how you know it is flooding and not just running out of gas from the fuel rail would be very helpful.
1) Do you hear the main pump each and every time you turn the key completely OFF and back to position?
2) The ECU will run the pump for about one second to pre-pressurize the fuel rail. This will provide barely 5 seconds of run time if you are losing rest pressure over night. Does it only do something after you crank it again or ONLY after a total turn off with the key switch.
3) When you crank an engine that means it turns over. You then have to ASK does it ever hit or just stay dead? If it does hit, does it run a very wee bit or just pop once in awhile? Is it only some fuel or too much when? Could it be bad spark with lingeringfuel or a jumped or broken timing belt?
Now that's a scurry of varmits all at once. If you have those, you got to pay real attention and take notes for a break in sequence. Call it, Stop using a shotgun and get more intimate with a pistol and dig through the wood pile.

You said you filled the gas tank and restarted the car at the station as you drove it home. It was later it suffered a no start! That's "A" clue for a "morning sickness" called a leak down NORTH of the fuel pumps. Besides for an occasional pump check valve or one the (4) injectors the FPR is a PRIME suspect for the lack of holding prime because its job is to dump excess fuel. Defining excess and when is always a lovely challenge! R&R with a "known good" one is easier. Just like with fuel/pump system relay.
Remember a buzzard circle and sniffs a lot but a Hawk, will always know which way North is by using the sun and shadows, (:-) of course, If you work on your car at night, you better think like and owl! (:-)

Have you ever pulled at least one spark plug to confirm wet plugs or if it's not sparking the plugs. That might lead you to think in terms lean or the same result with flooding with no burn. Someone suggested checking for spark already and we know it can run so one might pass that one by. Ignition still should always be a first suspect especially a rotor button in the middle.
If the plugs are very dry, the story they can tell, changes everything.

Ok, take notes and share any questions about them.
We all are a "brood" and just hanging out to help nurture a 240 back to health.
Yes! I'm as twisted as my replies! (:-)

Phil