Oldsmobile/Buick Repair: GM 3.8 Stalls or Dies, electric fuel pump, fuel pressure regulator

Question
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Followup To
Question -
I have a 92 Olds 88 with about 182K on it.  For the past six months I've noticed that if I make a right turn on park on a downward slop with a quarter tank of gas or less in it, it has fuel problems and stutters or starts and dies.  My son has a 91 Bonneville and my daugher has a 94 LeSabre.  All three cars has a 3.8 in them and all three act the same.  All three have over 125K on them and all three have new fuel filters.  I'm guessing the problem is probably common to them all, but I don't know what the problem.  No check engine lights on any of them.  So far our answer is treat the half tank fuel mark like the empty mark.  Any ideas.
Chuck
Answer -
I have seen problems with the small rubber hose leaking that attaches the electric fuel pump in the fuel tank to the metal pickup tube  which causes the engine to suck air into the fuel system causing your problem. Removal of the fuel tank is necessary to inspect this hose.

I have also see problems with the fuel rail and fuel pressure regulator also.

That makes more sense than anything else I've heard or thought of.  Hopefully this weekend I'll be able to pull the tank on one of them and check it out.  Of course, with the miles on the vehicles I'd probably be better off changing the pump even it was just the hose.  But at least I'd know I'm not changing the pump just as a hope.  I'll let you know how it turns out.  Thanks
Chuck

Answer
I am glad that you decided to replace the fuel pumps also. Be EXTREMLY careful as the replacement pumps usually come with new electrical connectors and MUST be utilized for installation on the new pumps as the old connectors tend to not fit correctly and can become loose thus causing erratic pump operation.

GM has a lousy reputation on their fuel pumps as it is the gas in the tank that is used to keep the pump from overheating due to the high speed operation of the pump and I have seen numerous pumps fail when the fuel level gets below 1/8 tank of fuel.