Air pressure escape then engine cut out

[gwentman]

Hi chimaera 450, the car has a whoosh niose from rear near side (exactly like letting an air bed down) then engine cuts out.
The car will immediately start and run, any ideas what the problem could be please.

[miniman]

Try opening the fuel cap.

[Loubaruch]

If the vent line to the carbon cannister is blocked your fuel tank may not be venting as Miniman says try removing the fuel filler and see if the problem goes

[gwentman]

Thank you both for your responses.
I have removed the filler cap after a short run,will.now see if the problem persists.