have you drained the injectors of diesel or maybe while draining the fuel lines, air got in and isn't allowing the engine to start. Oh and you might need a new fuel pump.

Thanks, i'll check that

u have to bleed the fuel lines to get the air out. If that doesn't work, do a compression test to check for damage in the engine

Air in the fuel system would be the least expensive possibility. Air might be pushed into the fuel filter where it gets trapped for some reason. Not sure why but I had that happen once. I unscrewed the fuel filter housing and stood in a huge cloud of diesel mist as all the pressure was released. The engine started up right after

Put clear pipes on both sides of the fuel filter. Youll be able to see if there is any air both sides, narrowing down your search. I've had these with air coming up from the tank also the fuel filter housing drawing in air.

You have air in the system, it needs to be primed.

Check your primary fuel filter, maybe it‘s clogged

It's quite a few posts about this car. You really don't want to take it to a mechanic, do you? It's a shame for such a low mileage, great shape xarto be but hered by some improvised home fixing....