Q7 Stalling when hot

Bjørn Roger Larsen

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Hello.

Having problems with my 2008 Q7 3.0tdi.
Starts prfectly when cold, but when hot it stalls as if out of fuel.
When trying to restart it, it takes a lot of turning over on the starter before it starts.
Rail pressure showing over 300bar on the starter.
Leave it for a while and it fires up perfectly..
New HP pump with regulator.
Anyone with similar problems?
 
Maybe a sensor is misreporting when hot & thus too little fuel is being injected, on A3 8p for instance, when it got hot, it used to have issues starting & this was down to coolant sender's, hence new one fixed the issue for most.