[ZV8888]

Hi

I have a warm start problem on my MY1978 911sc. After leaving the car for 30 min to 3 hours it may not start. If it does start, it'll start first turn of the key and either run just fine or die after a few seconds. Of course it may just not start at all. Outside these times it always starts and runs fine.

I have done a full set of CIS pressure tests and the pressures between the WUR and FD are correct for my 045 WUR :

System Pressure: 4.8 bar

Cold and not running: 17C / 1.7 bar

Cold and running: 17C / 2.0 bar
Warm and running without vacuum: 2.8 bar after 4 mins
Warm and running with vacuum: 3.5 bar after 10 mins

Residual pressures tested with and without gauge valve closed and were exactly the same:
10 mins: 2 bar
20 mins: 1.6 bar
30 mins: 1.4 bar
40 mins: 1.3 bar
60 mins: 1.2 bar

I have pulled an injector when the problem happens and I see there is no fuel coming out. So I have to I remove the air filter and raise the plate for a few seconds with the ignition switched on to get the fuel into the system. Then I can start the car.

I can't think of anything else I can check to solve this. (Fuel pump / FP Check valve / FP relay all good too) Any ideas?