CITROËN DS5 Owner's Handbook Manual page 242

Running out of fuel (Diesel)
On vehicle fitted with HDi engines, the fuel
system must be primed if you run out of fuel;
refer to the corresponding engine compartment
view.
If the tank on your vehicle is fitted with
a misfuel prevention device, refer to the
"Misfuel prevention (Diesel)" section.
If the engine does not start first time,
don't keep trying but start the procedure
again from the beginning.
1.6 litre HDi engine
 Fill the fuel tank with at least five litres
of diesel.
 Open the bonnet.
 If necessary, unclip the styling cover for
access to the priming pump.
 Squeeze and release the priming pump
repeatedly until resistance is felt (there
may be resistance at the first press).
 Operate the starter until the engine starts
(if the engine does not start at the first
attempt, wait around 15 seconds before
trying again).
 If the engine does not start after a few
attempts, operate the priming pump again
then start the engine.
 Clip the styling cover back in place.
 Close the bonnet.
2 litre HDi engine
 Fill the fuel tank with at least five litres of
Diesel.
 Open the bonnet.
 If necessary, unclip the style cover for
access to the priming pump.
 Slacken the bleed screw.
 Squeeze and release the priming pump
repeatedly until fuel appears in the
transparent pipe.
 Tighten the bleed screw.
 Operate the starter until the engine starts
(if the engine fails to start at the first
attempt, wait around 15 seconds before
trying again).
 If the engine fails to start after a few
attempts, operate the priming pump again,
then the starter.
 Put the style cover back in position and
clip it in place, ensuring that it has clipped
correctly.
 Close the bonnet.