The Diesel version of P323 have a pull fuel shut off cable.
Super easy fix. I have done this fix twice.
Buy the standard cable, they are sold in rough lengths. Get the length closes to yours.
Remove the old cable and save the T handle , replace with new cable, secure new cable, standard stuff. Now you will need to trim the new cable to fit your installation.
The outer jacket of the cable needs to be trimmed to fit in to the cable jacket housing on the Diesel engine. You can adjust the jacket housing by screwing it in or out for a fine tuned fit. A sharp knife will trim the outer housing. Insert in to jacket housing.
Snip the inner cable with jaw snips leaving excess length, tin snips will not work.
Insert inner cable into cut off lever and adjust fit, screw on T handle.
Two things:
1. The plastic trim where the T handle is located is too thin, it flexes if the handle is pulled up as apposed to out. I backed it up with a 1/4" plastic backing plate
2. Kill the engine yourself, guests pull the T handle straight up with vigor, snapping the cable
Good Luck