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I believe that's the return line to the tank, and if I'm right, it should show very little pressure if any. It's just a line that pretty much "spills" excess fuel back into the tank - I don't think there should be any restriction to that flow, hence little pressure there.
If the idle is "nice and smooth and the car starts easily" I would bet the compression is OK. Save that test for later.
Timing is a good thing to check. So also is a clogged fuel FILTER. It's very puzzling how a line would get clogged, as there are two filters, and the one downstream of the pump will catch very tiny particles. I've pulled apart a few fuel systems at the yard on high-mileage Volvos and they have all been squeaky clean.
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Bob (son's 81-244GL B21F/M46, dtr's 83-244DL B23F/M46, my 94-944 B230FD and 89 745 (LT-1 V8); hobbycar 77 MGB, and a few old motorcycles)
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