Really Strange Demonic Fault, Help And Advice Needed!!

Sounds like electronics failing when hot......
Hopefully not ecu, crankshaft sensor may be?
Can you hear the pump running ok?

 

Before you chase a phantom electrical fault I would verify you have not got water in the bottom of the tank. Refuelling coincidence or cause?

 

How old was the fuel that was in it from the off?

 

Its a process of elimination,or illumination.

 

Do you know that there were no error codes before this recent problem? Unless cleared error codes remain, so could be from a previous problem, those codes could easily be registered by switching ignition on whilst tank is off and disconnected.
When I said heat related electronics failure I meant internal discreet components self heating, not necessarily to do with engine heat.
Other less likely (IMO) cause could be fuel filter blocking up whilst running, then partially clearing when flow has stopped for a while?

 

Only 4 main componens in the Management system Air + water temp, Crank then ECU I would look for poor connections somewhere first, starting at ECU use contact cleaner not brake cleaner, then check the sensors.
Could be a discrete component in ECU getting hot then failing but that can happen to Crank sensot too.

 

Surely he wouldn't have got out his street if they are wrong way round and pump would have continud to run until it built up pressure, which would be difficult without fuel?
Still thinking electrical/electronic!!

 

The 955i's can go on wrong.

 

Don’t know about the error codes but could it be a blocked or partially blocked vent on the fuel tank.

Start with the simple things first.

 

Are we talking electrical or liquid connectors?

 

The fuel rail is a one way system, she will run, but ruff and wrong.

 

What are the symptoms of a bad pickup coil?
Engine stalling
engine stalling when hot
One of the first symptoms of a bad ignition pickup is an engine that stalls. An old or failing ignition pickup may cut out signal intermittently, which may cause the engine to stall. The engine may suddenly just shut off, almost as if the key had been turned off

 

Again I would try with the filler cap open. Also make sure the air flow pipe to the filter box is clear and filter good.
Regards
Joe.