Just a thought: years ago I had similar with my then Volvo 164, and went through most of the points Laird pointed out, to no effect. I had a spare fuel tank so swapped that in desperation - and all was fine.
I got inside the original tank and found the delivery pipe within the tank was just about rusted solid, almost blocking the fuel supply.
As an aside, I had similar on my P1800 two years ago and it turned out to be a blocked fuel filter so swapped that. However I was told some but not all 1800s had another filter in the tank - called something like a Saran filter. Worth a look just in case.
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