For 1990-2009 cars

## Fuel Injection Fuel Rail Crossover Tube Replacement LLT

### Removal Procedure

1. Remove the fuel injection sight shield. Refer to Fuel Injector Sight Shield Replacement.
2. Remove the high pressure pump shield. Refer to Fuel Pipe Shield Replacement.
3. Relieve the fuel system pressure. Refer to Fuel Pressure Relief.
4. Remove the intake manifold. Refer to Intake Manifold Replacement.
5. Loosen the fuel rail crossover pipe (1) fitting to the right fuel rail (2).
6. Loosen the fuel rail crossover pipe (1) fitting to the right fuel rail (3).
7. Remove the fuel rail crossover pipe (1) from the vehicle. Discard the pipe.

### Installation Procedure

1. Ensure that the fuel rail crossover pipe, right fuel rails fittings and left fuel rail fittings are clean and dry prior to assembly.
2. Lubricate the pipes with silicon free engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent.
3. Position the fuel rail crossover pipe (1) to the right fuel rails fitting (2) and left fuel rail fitting (3).

Caution: Refer to Fastener Caution in the Preface section.

4. Tighten the fuel rail crossover pipe fittings.

4.1. | Tighten the fittings first pass to 16 N·m (12 lb ft).

4.2. | Tighten the fittings final pass to 32 N·m (24 lb ft).

Note: If a fuel leak accrues at the right fuel rail fitting (2) or left fuel rail fitting (3), that component will need to be replaced.

5. Inspect for leaks using the following procedure:

5.1. | Turn ON the ignition, with the engine OFF for 2 seconds.

5.2. | Turn OFF the ignition, for 10 seconds.

5.3. | Turn ON the ignition, with the engine OFF.

5.4. | Inspect for fuel leaks.

6. Install the low side fuel pressure service port cap.
7. Install the fuel tank cap.
8. Install the intake manifold. Refer to Intake Manifold Replacement.
9. Install the high pressure pump shield. Refer to Fuel Pipe Shield Replacement.
10. Install the fuel injection sight shield. Refer to Fuel Injector Sight Shield Replacement.