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Along Art's train of thought, when starting first thing in the day, have someone watching the tail pipe. If the cylinders are that flooded I expect you should see an initial puff of black smoke. If you have a cold start injector on the intake manifold, don't discount that it could be leaking down the pressure.
Momentarily jumpering fuses 4 and 6 to prime the pump as Art suggests is easy to do. You can use a paper clip in one hand. (a paper clip in your car kit is good to pack for just such purposes). If you can start right away afterwards you know there's loss of pressure at the rail. If it starts perfectly normal then less likely to be leaking injectors, more likely the common FP regulator or pump check valve as you initially suspected. While jumping the fuses, if you listen underneath you can hear the main pump spin up. If there is loss of residual fuel pressure the pump noise may be more noticeable than when still pressurized with a warm engine.
I would expect if just one or two injectors are leaking you also would have an initial rough start after jumpering the pump. If you pull your plugs, be sure to read your plugs for differences. If you suspect the main injectors (or FP check valve) consider running a tank or two with a good injector cleaner to see if that helps improve things.
One way to check for a leaking regulator, in addition to sniffing the vacuum line for a leaking diaphragm, is to pull off the return line and stick a thimble underneath the outlet or use a short length of clear vinyl tubing pointed upward with a rag underneath to see if it collects gas overnight. The Standard FPR that Rock sells seemingly has a good reputation. IPD also sells it. FCPEuro has gone with Delphi. Pelican still lists the Bosch, although they're one of the few, so it may be just remnant stock on hand, not from a distributor, or an incorrect listing.
If none of that checks out, you may need to consider removing any cold start injector and then lifting the fuel rail for further inspection.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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