Fuel Pump Delivery Pressure

Turn ignition on. Pinch off fuel return line, and check line pressure. When line is plugged, there should be an immediate rise in line pressure.
CAUTION: DO NOT allow pressure to rise above 83 psi (5.8 kg/cm² ).
If line pressure does not increase, check for the following problems:
- At least 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 backwards, it must be replaced.
After checking fuel pump pressure, turn ignition off. Go to FUEL PUMP DELIVERY FLOW test procedure (DO NOT disconnect pressure gauge).