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996 turbo starts, runs then stalls

minny

minny

PCGB Member
Member
Last night while driving, my car was running fine then started losing power going up hill as if the car was running out of petrol then 5 seconds later, the engine just cut out. There were no warning lights prior to this. I was able to re-start the car and it ran fine with no fault lights and cut out again within 5 seconds. I was able to do this repeatedly.
C4 fuse is fine, I haven't checked the fuel pump relay and wanted to confirm that it is relay number 13 (996 615 101 00)? And advice about which terminals to bridge would be greatly appreciated.
The only codes I have logged currently is P1146 and P1156.
The tank is full of fuel and my pump is original. I wonder if the hoses on my 20 year old pump has succumbed to age and E10 petrol.
 
Yes, relay 13 is the fuel pump. You can bridge 87 and 38 to by-pass it temporarily.

P1146 and P1156 are for open circuit oxygen sensors ahead of the cat. Highly unlikely both would have failed simultaneously, and I doubt they would cause the symptoms you have. I would clear them, and see if they come back.
 
I used the PST2 to active the Fuel pump final stage in Drive Links for DME and i can hear the relay click and pump whirring. Would I be correct in assuming that the fuel pump sounds like it working ok?
 
I wouldn’t be surprised if its the fuel line on the pump, my friend had a small split in his on his 996tt wasn’t easy to find, i remember him making up and fitting some aftermarket pipes as genuine were a crazy price
 
I connect a fuel pressure tester today and it read 0 bar without doing anything. When I activated the fuel pump using Drive Links on the PST2, the pressure only went up to 0.8 bar. I have a new pump from OPC on the way and it’s cheaper than anywhere else online by £100 with a discount from the parts department.
 
Do I have to re-calibrate the fuel level sensor using the PST2 or PIWIS after I fit the new pump?
 
You shouldn't need to recalibrate the level sensor, but if the tank is less than about 1/4 full, and you disconnect the battery, then I would fill it up after completing the work. (The C4 saddle tank thing).
 
I have now replaced the pump and all is good. It broke down with a full tank of fuel so the pump was completely submerged but I pumped out half of it using a fluid transfer pump enough to have the hoses I had to disconnect at the pump above the fuel line. It was a bit fiddly but not difficult.
 
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