Fuel Pump Delivery Pressure

Turn ignition off. Disconnect banjo coupling at inlet to fuel injection manifold. Connect fuel pressure gauge, using existing seals. Hang pressure gauge vertically. Turn ignition on. Pinch off fuel return line. Measure fuel pressure. When line is plugged, fuel pressure should increase immediately.
CAUTION: DO NOT allow pressure to exceed 82 psi (5.8 kg/cm² ).
If fuel pressure does not increase, check for following problems:
- Less than 11.5 volts across fuel pump terminals.
- Obstructed fuel lines.
- Clogged fuel filter.
- Fuel filter installed backward.
- Defective relief valve in fuel pump.
  NOTE: If fuel filter has been installed backward, it must be replaced.
After measuring fuel pump pressure, turn ignition off. Leave pressure gauge connected. Go to FUEL PUMP FLOW .