Fuel Pump Pressure Test
- 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. Cover fuel line connector with shop towel to absorb any fuel spray before disconnecting.
- Connect a fuel pressure gauge between fuel line and injection manifold. Connect jumper wire between terminals No. 30 and 87/2 of fuel pump relay connector. See Fig 2 . Fuel pressure should be 36-42 psi (2.5-3.0 kg/cm2 ).
- If pressure is too low, pinch off fuel return line and recheck pressure. If pressure rises quickly, pump and lines are functioning correctly. Replace pressure regulator and recheck pressure. If pressure does not rise quickly, go to step 4).CAUTION: DO NOT allow pressure to exceed 86 psi (6.0 kg/cm2 ).
- 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 in 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 vacuum pump to pressure regulator. Line pressure should decrease as vcuum is applied to regulator.