There'll be an electric fuel shutoff valve somewhere all right. Decompression taps went out with the ARK and there's no ignition to turn off on a diesel.

You can probably get an alternator if that is the fault for the "ignition" light for maybe second hand 30 squid or recon from a proper expert electrical factor for about 90. For the latter, try TMF, Northfleet, Kent, they beat the band on batteries and electrical essentials for cars, usually.

The big issue is that smoking and misfiring.