987 wont start..

[satans worm]

Changed to winter tyres last night (i live in Zurich) and then drove it back to its spot in the underground car park no problems.
This morning I get in and the car turns over fine, but does not catch at all, so Im assuming this is a fuel pump issue? or are there any other common issues with the 987 that could cause this?
Could it be the immobilizer being locked on?
Any quick suggestion to try before i shell out CHF250 for it to get towed to the neared Porsche specialist and then get stung on CHF170 an hour to remedy? (if it makes any difference its a UK car)

Thanks

[sportsandclassic]

Coolant temp sensor is quite common. It may start in a few hours.