It depends on the outside temperature, the glow plugs only come on if its cold outside.

Taximan wrote on 29. Mar 2011 at 23:29:

Lets hope they don't fall apart

Hi again,ok i have checked the leak off pipes and they seem fine,i have replaced the big alloy relay to the glow plugs,it was a second hand one but was told it was perfect,i did replace the outside air temp in the winter with a patern onebut the car has been starting no bother untill 2 weeks ago,it is trying to go but just wont fire up,if i give it the slightest whif of easy start it go straight away,any ideas anyone please

I'd be looking at the fuel system rather than the electrics for the pre heaters...
If the leak off pipes are sound then may be the upper injector seals need replacing.
Only use easy start to confirm it is a fuel problem, don't use it to start your car every morning as you will eventually damage your engine.

Before you try and start it tomorrow morning check that the fuel filter housing is full to the brim with diesel (when putting back on the lid don't over tighten it as you will pinch the seal), if it's not full then fill it up and crank the engine for around 10 seconds, if it doesn't start then re-fill the filter housing and try again.