Too High System Pressure; Too Low System Pressure - Volvo 240 1989 Service Manual

SYS ~m
pressure
Fuel system LH2.4 - 240
D3
Chll(:k sYStem pressure
System pressure should be 300 kPa (42 psi).
1
Too high system pressure:
Remove lead between terminals 30 and 8712 on the
relay base.
Remove retum hose from pressure regulator. Blow
in the pipe.
Remove vacuum hose from pressure regulator. Blow
in pipe
If both hoses are open, the pressure regulator is
faulty . Replace it and recheck pressure .
Too low system pressure :
Squeeze relurn hose by hand and check if pressure
...
rises .
Important ! Do not allow the pressure to
exceed 600 kPa (84 psi) .
If the pressure rises rapidly the pump and , h oses are
OK. Replace pressure regulator and recheck pres­
sure.
If the pressure rises slowly, the fuel filter, fuel pump
strainer or the fuel lines are dogged or blocked.
If the pressure doesn 't rise the fuel pump is faulty.
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