Nissan patrol GU 2002 diesel 3.0L

Hey everyone, nice to meet y'all!
I'm new to here, as I have just purchased my first Nissan two weeks ago.
Me and my partner are traveling with a roof top tent and a surfboard :)
two weeks ago the engine started choking and then did not start ever since,
we've already been to 3 garages and on our way to the 4th trying to figure out what was the problem (somewhere around the fuel pump i guess.. but they seem to think it's an electric problem..)
Anyways,
I'm looking for a manual of my engine, just to get to know it better.
It's a ZD30 of 2002 (without common rail)

Thanks!
Maya

Welcome to the forum.

Those sound like black and white symptoms of a pump failure on a Di ZD30.
Unfortunately not a cheap exercise to replace, if indeed, it is the pump.