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I have been fighting this for to long so hoping somebody may have an idea, thanks in advance for any and all input.

My 1999 996 stopped when I pulled into a store, it wouldn't re-start right away and it drained the battery very quickly so I put in a new battery and the car started and drove home fine. Next weekend took the car out again and it died again after about 20 minutes, would not re-start and to date has not. Checked several sites all pointed to fuel pump so I replaced the fuel pump, next fuel pump relay still no fuel pump run? Crank position switch, replaced, cam position replaced. By now I have become frustrated and starting to second guess myself. When I jump the fuel relay I can here the fuel pump start but do not get any fuel pump when I turn the key on. I can spray starting fluid and engine starts so I have compression and spark. 

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35 minutes ago, jack hulne said:

I have been fighting this for to long so hoping somebody may have an idea, thanks in advance for any and all input.

My 1999 996 stopped when I pulled into a store, it wouldn't re-start right away and it drained the battery very quickly so I put in a new battery and the car started and drove home fine. Next weekend took the car out again and it died again after about 20 minutes, would not re-start and to date has not. Checked several sites all pointed to fuel pump so I replaced the fuel pump, next fuel pump relay still no fuel pump run? Crank position switch, replaced, cam position replaced. By now I have become frustrated and starting to second guess myself. When I jump the fuel relay I can here the fuel pump start but do not get any fuel pump when I turn the key on. I can spray starting fluid and engine starts so I have compression and spark. 

 

Welcome to RennTech :welcomeani:

 

Have you checked the actual fuel pressure?  You also have not mentioned the fuel filter or the fuel pressure regulator, both of which could be part of the equation. 

 

I would also be looking at the ignition switch electrical section, a known weak point that causes all sorts of electrical issues when it goes bad.

 

Good luck.

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42 minutes ago, JFP in PA said:

I would also be looking at the ignition switch electrical section, a known weak point that causes all sorts of electrical issues when it goes bad.

This!

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No fuel pressure in the engine compartment as I get no fuel pump run. One question I have, is the fuel pressure regulator controlled by the FRC that some have mentioned located on the relay tray in the rear and if so does it also control power to the fuel relay under the dash? If it switch issue can you replace just the mechanical switch or do I have to have the key reader, ECM and Immobilizer?

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1 minute ago, jack hulne said:

No fuel pressure in the engine compartment as I get no fuel pump run. One question I have, is the fuel pressure regulator controlled by the FRC that some have mentioned located on the relay tray in the rear and if so does it also control power to the fuel relay under the dash? If it switch issue can you replace just the mechanical switch or do I have to have the key reader, ECM and Immobilizer?

 

No, it is located on the fuel rail and is a mechanical device.

 

The ignition switch is a cheap  electrical part of the key assembly that requires no programing to replace.  It is a pain to access, but controls ALL electrical functions in the car:

 

spacer.png

 

A DIY how to here: How to change 996 ignition switch electrical section

 

Be sure to buy the factory part, aftermarket versions are notoriously bad..............

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35 minutes ago, jack hulne said:

Thanks! Switch has been ordered and will update when I have it in.

 

These switches are a common electrical fault source in these cars; fortunately they are not expensive and are a common DIY project.

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