Volvo Workshop Manuals
V90 L6-2.9L VIN 96 B6304S (1998)
Maintenance > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > System Diagnosis > Testing Notes > Page 717
Starting Fuel Pump
Remove fuel pump (FP) relay position 2 in the integrated relay/fusebox on the left of the dashboard.
Connect jumper cable across relay base terminals 1 and 3.
Switch ON ignition, fuel pump should start.
Continue with: Measuring Line Pressure.
Measuring Line Pressure
Read off line pressure from pressure gauge.
Line pressure should be 300 kPa (3.0 kp/cm2) (42.6 psi).
If line pressure is OK:
Proceed to: Checking Fuel Filter section below.
If line pressure is too low:
Proceed to: Line Pressure Too Low section below.
If line pressure is too high:
Proceed to: Line Pressure Too High section below.
Line Pressure Too Low
Squeeze the return line and check if the pressure rises.
CAUTION: Do not allow pressure to exceed 600 kPa (85.3 psi).
If pressure rises:
Pump and lines OK. Try a new pressure regulator. Then measure line pressure. Proceed to: Measuring Line Pressure section above.
If pressure does not rise:
Check filter gauze at fuel pump. If the filter gauze is OK: replace fuel pump. Then measure line pressure. Proceed to: Measuring Line
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