Fuel Pump Pressure
- Remove panel under right side of dash. Remove fuel injection system relay. See Fig 1
. Crank engine for at least 5 seconds. If engine starts, let run until it dies. Before disconnecting, cover fuel line connector with shop towel to absorb any fuel spray.
Courtesy of VOLVO CARS OF NORTH AMERICA.
- Connect a fuel pressure gauge between fuel line and injection manifold. Connect jumper wire between terminals No. 30 and 87/2 of fuel injection system relay connector. See Fig 2
. Fuel pressure should be 36-42 psi (2.5-3.0 kg/cm2
).
Courtesy of VOLVO CARS OF NORTH AMERICA.
- If pressure is too low, pinch off fuel return line and recheck pressure (DO NOT
allow pressure to exceed 86 psi (6.0 kg/cm2
). If pressure rises quickly, pump and lines are functioning correctly. Replace pressure regulator and recheck pressure.
- If pressure rises slowly, fuel filters or lines are blocked. If pressure does not rise, pump is defective.
- If fuel pressure is high, disconnect fuel return line from pressure regulator and blow into line. If line is open, pressure regulator is defective and should be replaced.
- Pressure may also be checked with engine off and fuel gauge connected. Attach a hand-held vacuum pump to pressure regulator. Line pressure should decrease as vacuum is applied to regulator.
- With 12 volts applied, pump volume should be 1.22 qts. (1.08L) in 30 seconds.