Porsche Cayenne 3.2 V6 955 faulty fuel pump and erratic fuel pressure

Porsche Cayenne 3.2 V6 2004. Video has faulty fuel pump pressure with pressure gauge at cold engine. Then I remove fuse 13 and 14 and show how they affect fuel pressure. Also the right pump priming is seen on video. The faulty fuel pressure causes erratic idle. After short time, pump gets warmer and sometimes the pressure is stable.

[@TestaFranco]

Thanks for the video. Really helpfull I dindt know this info. By left pump(the one that runs when engine is running) you mean driver side pump? Happy new year

[@Theloial]

Yes, left pump is driver side pump. Thanks!

[@elianxavier6714]

Friend, can you put a link to the correct pump. I mean, the one with the regulator is the right?

[@Theloial]

The left pump with filter is running during normal driving and idle. The right pump with regulator is the priming pump running a short time before start-up.

[@leonli8586]

I have similar situation during start up. Does it means that i need to change the right pump?

[@Theloial]

You need to change the left pump. It is running all the time when engine runs. The right pump is only used at start up (the driver door opens and right pump primes the lines. You can hear the noise when opening the door first time), during full throttle and when the tank is almost empty. If right pump fails, you have longer start-up time.