Mid 90s there was a i knew who used to import Mitsubishi pajeros.
They removed the fuel tank cut the neck off the tank and welded a plate in.
Then welded the neck back on.
Lifted the rear seats cut a hole and welded a motorbike petrol cap on top of the diesel tank.
You had to lift the back seats to fill it with cherry.and fill the neck up to the filler cap with white diesel.
If you were pulled and they dipped the tank.only white they could get out.
That was before they uses to swab the exhaust pipe for signs of cherry.