[Porsche9]

Look under the frunk hood for a white option code sticker. It's a four digit code that is sometimes hand written on the sticker. It was on mine.

#3 may have been caused by #4. There are many other reasons that could cause the issue. Don't just replace the fuel pump without diagnosising the actual problem. Either have a mechanic look at it and see if the car threw a code or two that might tell you what the issue is or get a durametric and check yourself. Just replacing random parts is going to get expensive. This is a Porsche we are talking about so parts tend to be expensive.