Fuel System Pressure Test
- Remove air cleaner and plug thermal vacuum port on throttle body. Remove steel fuel line between front and rear throttle body units. When removing fuel line, always use 2 wrenches. Install a fuel pressure gauge (J-29658 or equivalent) between throttle body units.
- Start car and observe fuel pressure reading. Use Fuel System Diagnosis chart if pressure is not between 9-13 psi (.6-.9 kg/cm2 ). Use Injector System Diagnosis chart if pressure is between 9-13 psi (.6-.9 kg/cm2 ).
- Remove fuel pressure gauge and install steel line between throttle bodies. Start car and watch for leaks. Remove plug from throttle body thermal vacuum port and reinstall air cleaner.