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[05omegav6]

Heatsoak whislt engine off might exacerbate a weakness which is only present at low idle speeds when warm...

If it were a pump issue then it wouldn't rev, and if it were a an injector issue it would misfire... Not much else in the fuel system to cause an issue... And being mechanical rather than electrical it won't raise a code.

[terry paget]

Good thinking Al. I had a Citroen 2400 estate in the 1970s, my first big car, Webber carburretor petrol engine. It would start cold fine, it would restart hot fine soon after stopping. But half an hour sfter stopping it would start, run for 15 seconds then stop and refuse to restart. If cranked for a minute it would usually restart. Most annoying fault, especially on the Isle of Wight ferry. Dealers could not help me. Eventually traced to engine heat  (heatsoak?) evaporating the fuel in the feed pipe. I bought another Citroen CX later and a new Haynes manual, and that incorporated a complicated modification with special spares to overcome the problem.

The only spare  fuel pressure regulators I have are on V6 fuel rails and seem to be part of the fuel rails.