The car turns over for ages and then coughs and splutters to life and kicks quite a bit of smoke out
I’ve replaced fuel filter
Battery is good
Both fuel pumps are working correctly
Glow plugs and relay checked

It’s not showing any fault codes

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sounds like glow plugs are goosed so not pre-heatin the derv up pal , id try new ones before doing anything else as you have to rule them out

Glow plugs have been tested and the glow plug relay has been tested

Stonie110,

if glow plugs and relays are OK, pumps are working, new fuel filter - next suspect must be injectors.

I use 2T oil (1/2 litar per tank) and it works cleaning and lubricating the injectors.

It is going in to garage next week for injector tests.

If it's a TDV8, read on......
Or, as happened to me after replacing the fuel filter, I had to bleed an air lock in the fuel system.
Take the top plastic cover off the engine and as you look at the engine from the front, look dod what looks like a bicycle tyre valve. Press it down until fuel comes out and Bob's your auntie!  Got - 2017 SDV8 Autobiography in Loire Blue
Had- 2008 TDV8 Vogue SE in Java black
Had - 2007 S/C in Stornoway Grey

It’s the 3.0 td6 engine

Check the HP pump pressure relief valve on the back of the pump with a diagnostic tool the lp pump should read 3 bar the HP should be about 300 bar.

It has been plugged in and both pumps are working fine