RE: nonstarting 240D
Well,yes and no.(fuel delivery).
It could just be the battery that is
That is why you need to trickle charge it.
Trickle charging is slowly charging untill
A diesel needs lotsa power to start,hence
the big a$$ battery.
A diesel starts by compressing air in the
cylinders,creating heat,glowplugs only heat
the air up so the engine has an easier job.
As the heat builds,fuel is injected,this
ignites the the mixture.
So if the starter is turning slow due to a
low battery the engine will have a hard time
I don't know how long the car has sat before
you bought it and how long it has been sitting
As the car sits for a number of months the
fuel drains back into the tank and when
you start it the lines will have air in them.
Also condensation in the fuel will cause algea
to grow and plug up the inline fuel filter,
cutting of the fuel to the injection pump.
As a general rule,if you have a running/not
running problem the fuelfilters are the first
to look at.
Bad fuel,algea and airleaks can cause the engine
to stall,run rough and some other strange problems.
Next would be the glowplugs but since you already
replaced them we more or less can rule them out.
But not completely,because the question now is,
"DO they work?"
There is a fuse(Metal strip with a screw on each side) in a black little box on the firewall that
could be bad.
When you turn the key to the pre-glow position,
does the wire going from the black box heat up?
You should be able to see it glows red hot.
If yes,the fuse is OK.
Not,then check it.
Lastly the fuel injectors,they last fairly
long and are hard to check.
Although they might tell you themselves that
something is wrong.
You might hear them nailing,but this would not
have an impact on starting unless they all
Concentrate on the battery and filters
Just ask and all of us will try to help
you find a problem/solution.