Hi
Probably not best placed to give advice on the workings of the EFI system. Carb & dizzy with points dinosaur !!
But I would imagine if you disconnect the fuel rail feed pipe & turned the igniton on, you would get a powerfull constant flow of petrol. This has been the case when I have checked for fuel in the past on an electric pump system.
I may be wrong, but I think the fuel pessure regulator is connected to & part of the fuel rail.
Possible fuel pump fault ??
I have known this type of symptom to be caused by a poor earth connection at the fuel pump.
I hope you get it sorted. OK
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