Volvo Workshop Manuals
V90 L6-2.9L VIN 96 B6304S (1998)
Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > System Diagnosis > Testing Notes > Page 1257
Pressure section above.
Line Pressure Too High
Disconnect jumper cable between relay base terminals 1 and 3.
Disconnect return line from pressure regulator. Blow into line.
If the cable is OK:
Try a new pressure regulator. Then measure line pressure. Proceed to: Measuring Line Pressure section above.
If the line is blocked:
Check if the return line is blocked, clean/replace. Then measure line pressure. Proceed to: Measuring Line Pressure section above.
Checking Fuel Filter
Squeeze the return line and check is the pressure rises.
CAUTION: Do not allow pressure to exceed 600 kPa (6.0 kp/cm2)(85.3 psi).
If pressure rises rapidly:
Proceed to: Checking Pressure Regulator, Lowering Pressure section below.
If pressure rises slowly:
Replace fuel filter.
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