110cdi engine turns but won't start

Hello.
My 2002 110cdi vito will only bump start.
The engine turns over with the key but won't start.
When it goes it runs perfectly. It's done 25000 miles.

I let the tank run low before the problem, so thought
it might have sucked in some muck from tank?

Now after reading forum sounds like vito's have problems with injectors.

Any ideas please
Thanks