Not so long ago I hit a pothole in my 2.0 DOHC Sierra and it cut out and there was no sound from the fuel pump, Obviously I thought it was the fuel cut off switch in the boot, but when I lifted the spare wheel there wasnt one and it would seem that there never was. I was under the impression that all these cars had this switch, there is even the warning message on the drivers sun visor but I can find no switch.

Any of you lads have any ideas where else this switch could be???