L984 240 DL Volvo won't start after being turned off! (AGAIN)

I’m back, had some info very wrong in my first attempt. The Volvo starts perfectly when cold and when it is turned off will not start again. I DOES crank over. We have to leave it for a few hours to 1/2 day then it starts up perfectly. Does anyone know where the COLD START VALVE is located or if it has a HOT START VALVE as well and the location??? Husband is trying everything short of slicing open the wire harness. We live on a small island and can’t get it to the mainland via ferry due to the fact that once it is turned off, wont start up again. Patty