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NO start, NO fuel not the F/P relay

znl

By znl
in 996 TT, 996 TT S, 996 GT2

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znl Member

znl

Posted
Posted (edited)

I have a car that stalled and now wont start. After doing some diag I found that the fuel pump was not working and I could jump the fuel pump relay and it would start, but this is where I started to run into trouble I replaced the fuel pump relay and still no start I traced the problem to the DME not giving the relay the ground signal, I could apply a ground to the pin at the DME and it would run so I replaced the DME with a new one and ended up with the same issue, do 996 have a rollover/crash switch or what is the DME looking for before giving the fuel pump the ground signal? 

 

Edited by znl
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JFP in PA Member

JFP in PA

Posted
  • Moderators
Posted
18 minutes ago, znl said:

I have a car that stalled and now wont start. After doing some diag I found that the fuel pump was not working and I could jump the fuel pump relay and it would start, but this is where I started to run into trouble I replaced the fuel pump relay and still no start I traced the problem to the DME not giving the relay the ground signal, I could apply a ground to the pin at the DME and it would run so I replaced the DME with a new one and ended up with the issue, do 996 have a rollover/crash switch or what is the DME looking for before giving the fuel pump the ground signal? 

 

 

Welcome to RennTech :welcomeani:

No, they don't have a rollover switch, but they do have a crank position sensor which shuts the fuel pump off when they go bad...…...

znl Member

znl

Posted
  • Author
Posted

Well about that the car has a LS7 and was running with that motor when this started the DME runs the car side and the GM ECU runs the engine so I don't think its that and I don't see much over lay, but I did not do the swap I got the car with the LS7 

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JFP in PA Member

JFP in PA

Posted
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Posted
1 hour ago, znl said:

Well about that the car has a LS7 and was running with that motor when this started the DME runs the car side and the GM ECU runs the engine so I don't think its that and I don't see much over lay, but I did not do the swap I got the car with the LS7 

 

You know, when you post on a Porsche technical forum, it would have been helpful to perhaps at least mention you had a GM engine in the car and are running two completely incompatible computer systems.  As such, I have no reference point to offer any diagnostic help.

 

Good luck...…….

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