Guys,

I recently bought a used 911 S with 40000 miles and found myself in a never ending issue with fuel pumps.

One day while I was driving I got a check engine light and we basically replace the low pressure pump, sensor and the control unit since the car while driving it was losing power and sometimes it would crank but wasn't starting up.

Then they check psi on fuel lines from front to the back and it was OK on the low side but the psi on the 2 high pressure pumps was off.

We just replaced the 2 high pressure pumps and the check engine is still on and I am getting these attached error messages. Now they checked PSI and the high side is good but the mechanic told me the low side is now off. I am totally confused on what's happening. I drove the car today 150 miles and it didn't turn off on me nor did it show decreased power. They just ordered another low pressure pump to replace it as a last effort to try and fix this issue. They flushed the lines before for possibly contaminated fuel and I put new premium gasoline. I was told one another possible thing is to replace the fuel lines for possible internal rust/breakage which is rare to happen , very time consuming and expensive (mechanic hours) to do.

Any idea what can be happening ?? I am desperate the car is in the shop for 4 months now. I appreciate all the help.