Fuel Injection Rail Problems of Cadillac XLR

I currently own the above Cadillac vehicle which I purchased privately in August 2010 with less than 40,000 miles registering on the odometer,I now have 44,500 (aprox) during the time I have owner it,,,the engine has shut off 17 times under various conditions. I am a licensed mechanic so I have the background to be able to diagnose vehicle problems,,,but this one has me perplexed the car has stopped when at idle or at highway speeds at various levels in the tank. The one thing that I notice in common is that the fuel at the fuel rail test port, is aerated and at about 15psi. . . . The engine will not run at this point. Most of the occurrences have been when the car was in motion and I have managed to get the car clear of the roadway,but three times I needed assistance to push or pull it from traffic. I only today learned of a recall possibly affecting my car,,,,more than 4000 replacement fuel pumps have been identified as suspect and I might well have one. I believe the former owner may have experienced the same problem possibly leading him to sell the vehicle, out of frustration,I know it has certainly affected my wife and I. . . . She wont even ride in the car anymore ,out of fear we will be involved in an accident due to the car stalling. The car has been in at the local Cadillac dealer in tucson with no success. . . . And now it is a safety issue. I really need your assistance with this problem. Sincerely.

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