Hi You all!
I'm new to this site & just finding my way round to get some help with my Disco TD5.

The engine cut out while driving along at 60mph, as though it had run out of fuel & the fuel pump was making a lot of noise "air in system" when I tried to restart, I did get it running but with a misfire and only drove for 300yds, arrived home on the back of a recovery truck!
Since then I have fitted 2 new fuel pumps "first one faulty" had the injectors re sealed at Gee Diesels in Nottingham they quoted me £800 to fit a new engine wiring loom! so I fitted a new injector and engine wiring loom/harness, replaced the O ring seals in the filter housing connections. The engine will start after purging the fuel system and with a lot of cracking on the starter but misfires and cuts out after 2/3 minuets and wont restart until the fuel system has been purged again and a lot of cranking on the starter. I am at a loss any ideas?

injector seals, fuel tank breather blocked, Fuel pressure regulator, chafed fuel line, blocked or fecked fuel filter, faulty injector, oil contamination of the ecu.

could be crack in cylinder head. Make sure of facts before you let someone fit main loom or ecu, often not the problem with these cars.

In the case of my TD5, it was crap in the tank blocking the fuel pump's intake filter. Very similar symtoms to what you dsescribe.