fuel pump &/or fuel pump relay problem
 

My 911 C4 starts right up but then dies after heating up & running 15-20 minutes. Then it'll crank but won't start. After sitting/cooling for awhile it starts right up but then the same routine persists; it dies after the 15-20 minutes. When you turn the key to the on position you can hear a high pitched humming in the fuel pump for 5-10 seconds before you hear clicking. It's not the normal clicking noise you hear from a fuel pump either. So I'm guessing after it warms up the fuel pump quits working or there's a fuel pump relay that's stops working or both...?

I read some of the "hot starting" posts but I'm guessing those won't restart after they're hot vs. the car quitting while running & then won't restart until it sits/cools...?

Any feedback is greatly appreciated!!!

Thank you,
Dean

HP Fuel Pump
 

don't know the year of your car, but the fuel pump on my 2010 was replaced under warranty. didn't exhibit any issues.