[rondeo]

Just some addition/corrections for my diesel fuel filter how to notes.

The fuel connectors are probably metric sizes - 8mm and 12mm.
On this basis blanking plugs could be from 7.5 to 8mm and 11.5 to 12mm,
with a looser fit preferred to avoid damage.

Air shouldn't get in the lines if the connectors are plugged.
In the unlikely event there is air in the system the system may self-bleed
by operating the starter for a maximum of 10 seconds (source: Ford manual).
The reason for the ten second limit: overheating the starter motor.

If there's too much air in the system (eg someone forgot to prime the filter!!)
then it will be necessary to bleed from the fuel line in the engine bay,
special adapter required.

The filter can be changed with the housing remaining on the vehicle, but I
find it easier with it off.

There's a youtube video on changing the fuel filter which demonstrates air
getting in the system, and subsequent DIY bleeding. This can be avoided by
using blanking plugs.