When the car first starts, it uses both pumps for about 10 seconds. Then decides what pump to use; when the tank is above 3/4 the secondary becomes the primary. Doing a 5-minute battery pull seems to reset the computer so that the primary stays as the primary.. until restart. This means your secondary pump is dead or on its last legs. The connector also melts, so you want to replace the firewall flange connection as well, otherwise, you will be going through fuel pumps like crazy. - Stay off the boost!!
Yes! - Robert I hope I can safe you a lot of trouble and money. This problem was caused by a bad fuel pump relays. The bad relay melted a part of the wire going to fuel pump (pumps - the car has two) as well. Where are you living ? In Milford, CT there is a shop called Butzigear they know exactly what is wrong (saw them fix a 997 Turbo with this problem on Instagram @butzigear) - mine was fixed by a shop in Germany ... we also replaced the fuel pump which was probably overkill ...sorry for the late reply... if it turns out to be the same thing on your car would you let me know? I like to collect as much knowledge on the 997tt as possible.
![Was kostet ein Porsche 911 🤑 ?? // 997.1 Turbo Unterhalt [alle Kosten]](http://i.ytimg.com/vi/hVf3GZy442o/mqdefault.jpg)
![Porsche vs. Nordschleife 8:21 BTG [Porsche 997 Turbo - 2007]](/img/n.gif)
Any recent updates to Turbo ?
Was very useful, thanks.
When the car first starts, it uses both pumps for about 10 seconds. Then decides what pump to use; when the tank is above 3/4 the secondary becomes the primary. Doing a 5-minute battery pull seems to reset the computer so that the primary stays as the primary.. until restart. This means your secondary pump is dead or on its last legs. The connector also melts, so you want to replace the firewall flange connection as well, otherwise, you will be going through fuel pumps like crazy. - Stay off the boost!!
I have an 2008 that's now doing this.
Did the problem ever come back again after disconnecting the battery?
Yes! - Robert I hope I can safe you a lot of trouble and money. This problem was caused by a bad fuel pump relays. The bad relay melted a part of the wire going to fuel pump (pumps - the car has two) as well. Where are you living ? In Milford, CT there is a shop called Butzigear they know exactly what is wrong (saw them fix a 997 Turbo with this problem on Instagram @butzigear) - mine was fixed by a shop in Germany ... we also replaced the fuel pump which was probably overkill ...sorry for the late reply... if it turns out to be the same thing on your car would you let me know? I like to collect as much knowledge on the 997tt as possible.
Stay safe - maybe this one should be checked in a garage?
Hans Brodi's Garage niiiiiice