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.

[JeffBowlsby]

The MPS holding vacuum is not a definitive test. I've seen several MPS that hold vacuum and yet the diaphragm is fractured, sometime completely. I would open that MPS up to verify the diaphragm condition and replace the diaphragm if its torn.

[Halfnelson]

The MPS holding vacuum is not a definitive test. I've seen several MPS that hold vacuum and yet the diaphragm is fractured, sometime completely. I would open that MPS up to verify the diaphragm condition and replace the diaphragm if its torn.

Thanks Jeff, Is there a way to check without breaking the unit open? If I do I guess it would then need recalibrating?

[Halfnelson]

The MPS holding vacuum is not a definitive test. I've seen several MPS that hold vacuum and yet the diaphragm is fractured, sometime completely. I would open that MPS up to verify the diaphragm condition and replace the diaphragm if its torn.

Thanks Jeff, Is there a way to check without breaking the unit open? If I do I guess it would then need recalibrating?

Also would that present as an intermittent issue as it has had a few runs where it's seemed to be fine?

[JeffBowlsby]

Also would that present as an intermittent issue as it has had a few runs where it's seemed to be fine?

Thats exactly how it would behave.