Djet running way too rich... Still! Options

[Halfnelson]

Had a previous thread starting in 2022 about my 73 1.7 standard D-Jet running way too rich and flooding to the point where it wouldn't start. It's been an ongoing issue. I've had a go. 2 garages have had a go. I'm at the point where I'm beginning to lose hope.

A recap. Bought the car 2021, had a problem with intermittent flooding. So far have:
Checked MPS - holding vacuum.
Replaced CHT sensor and tested. Working when flooded.
Replaced fuel pump and tested pressure.
Replaced all vacuum hoses and tested for leaks.
Valves set and rechecked.
New 123 distributor.
New injectors.

Each time I think I've cracked it and it runs and drives - sometimes for a month or so. Then I'll go to start it and it'll flood again to the point where it contaminates the oil. I feel like I've never managed to get to the bottom of the problem. Just keep replacing parts. Thinking maybe a return line that intermittently blocks? I'm kind of at a loss.

[technicalninja]

What he's describing appears to be fuel fouling BEFORE he tries to start it.
Sounds like it doesn't even bark or cough for him.
He's WET!

And it's intermittent...
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Next time it doesn't start I'd pull a plug IMMEDIATELY and check for wet.
If the plug was dry enough to fire I'd verify spark next.

Does it run a vacuum referenced FP regulator?
If so, check the vacuum line for evidence of fuel
That's almost NEVER intermittent, but it doesn't take long to verify.

I'm interested in what it turns out to be.

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