VDL Futura FHD2 E6, Workshop Manual

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Futura FHD2/FMD2 E6
DIAGNOSIS
Systems
2 - 16
2
DD1020_01
2.7.4 REDUCED MAXIMUM ENGINE SPEED
2.7.5 THE STARTER TURNS THE ENGINE OVER BUT
THE ENGINE DOES NOT START
2.7.6 THE ENGINE STALLS, BUT RUNS AGAIN AFTER
IT HAS BEEN RESTARTED
Possible cause Remedy
There is air in the fuel system. Check whether any air is drawn in. Pay particular atten-
tion to the suction line and the delivery pump’s oil seal.
Bleed the fuel system.
The fuel fine filter is blocked. Replace the fuel filter and clean the system.
The fuel supply pump’s delivery is too small. Check the fuel supply pump and the gallery pressure.
There is a fuel leak between the injector line(s) and the
injector(s). Check around the injector(s) for fuel leaks and, if neces-
sary, replace the injector line(s).
There is a mechanical fault with the pump unit(s) or it/
they is/are blocked. Check the operation of the pump unit(s).
Possible cause Remedy
There is air in the fuel system. Check whether any air is drawn in. Pay particular atten-
tion to the suction line and the oil seal for the fuel delivery
pump.
Bleed the fuel system.
The fuel filter is blocked. Replace the fuel filter and clean the system.
No fuel supply/the fuel supply pump is faulty, no delivery. Check the fuel level.
Check the lines for blockages and leaks.
Check the fuel supply pump.
Check the gallery pressure.
The fuel pressure control valve remains open. Check the gallery pressure.
Poor fuel quality. Drain the fuel, rinse the fuel system, replace the fuel fil-
ters and fill the fuel tank with fuel.
Possible cause Remedy
There is air in the fuel system. Check whether any air is drawn in. Pay particular atten-
tion to the suction line and the oil seal for the fuel delivery
pump.
Bleed the fuel system.
The fuel pressure control valve remains open. Check the gallery pressure.