Fuel Pressure Regulator
- Connect a fuel pressure gauge between fuel line and fuel injection manifold.
- On 240 DL/GL, remove panel under right side of instrument panel. Disconnect fuel system relay connector. See Fig 1 .
- On all models except 240 DL/GL, remove fuel system relay. Fuel system relay is located in fuse/relay box. See Fig 1 .
- On all models, energize fuel pump. Connect a jumper wire between terminal No. 30 and No. 87/2. Observe fuel pressure reading. Fuel pressure should read 42 psi (2.0 kg/cm2
). If pressure is too low, pinch off fuel return line and recheck pressure.CAUTION: DO NOT allow pressure to exceed 84 psi (5.9 kg/cm2 ).
- If pressure rises quickly, fuel pump and lines are functioning correctly. Replace pressure regulator and recheck pressure. If pressure does not rise quickly, go to next step.
- If fuel pressure rises slowly, fuel filters or lines are blocked. If pressure does not rise, fuel 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 vacuum pump to pressure regulator. Pump vacuum pump. Line pressure should decrease as vacuum is applied to regulator.