Fuel cut off switch in a '96 Fiat Ducato

[geordieracer]

Help needed folks! I've the dubious pleasure of working on a Fiat Ducato this evening and need to find the fuel cut off switch that it claims to have; however I've no handbook and the owner reckons he doesn't have a handbook.
Annoyingly we need the van working in the next 12 hours and I think all I need to do is resit the switch, but I can't find it!
Over to the PH masses!
Thanks!

Edited by geordieracer on Sunday 19th June 22:22