[Kev0607]

It definitely sounds fuel related. My guesses would be;

-Fuel pump

-Injector(s) returning too much fuel to the tank so there's not enough pressure in the fuel rail to start the car

-Fuel pressure sensor

There may be no fault codes as in a light on the dash, but there could be something in Volvo diagnostics that may point you or a mechanic in the right direction. It needs looking at by somewhere with proper diagnostics.