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2006 9-3 Aero
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When the car is warm but sits for >15 minutes, I have to relieve the pressure on the fuel pressure sensor in order to start it. It cold starts fine, idles fine, drives fine, and will start fine if it's been <15 minutes of sitting when warm. This past time when I had to relieve the pressure to start it, it died, restarted with some application of the throttle after it fired, then idled fine. All this started after I had the fuel pump replaced with a Delphi unit to fix the P0089. The P0193 showed itself after I took it to fill it with gas after the pump being replaced, which I cleared assuming the car just needed to readjust from being run with the original fuel pump going bad. I replaced the sensor too thinking that was the issue, but that wasnt it. I'm taking the car back to the shop I had put the pump in on Monday to see if they can fix it and run pressure tests for me; but they arent a Saab shop, and there arent any specialists even remotely close to me. The only thing that's even giving me a hint of what might be wrong is the "Pending" P0193 code when I read the codes, which translates to a "Fuel Rail High Performance" code. But I had my friend read the car with his Tech II and it showed nothing. Has anyone experienced this before? Any insight on what might be going on with it? Thanks.
 

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Possibly the PWM controller for the pump? That thing is under the seat IIRC. There are diagnostics in Tech 2 for exactly this - if you can find a GM shop, they should be able to help. The motor was used on Cadillacs as well, so a competent Cadillac shop can probably offer guidance.
 
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