General Motors — Fuel Rail Assembly Replacement
Repair & overhaul
From a General Motors service manual — check it applies to your exact model before use.
Before you start
- Relieve the fuel system pressure before servicing the fuel system components
- Support the rail to avoid damaging its components and prevent dirt from entering open lines
- Safety glasses must be worn when using compressed air
Procedure
- Disconnect negative battery cable
- Relieve fuel pressure
- Disconnect fuel inlet line, holding fitting in rail with a wrench
- Disconnect fuel outlet fitting at pressure regulator, holding regulator with a wrench
- Disconnect vacuum line to fuel pressure regulator
- Remove pressure regulator retaining screw and pressure regulator
- Disconnect electrical connectors from injectors
- Remove four fuel rail attaching screws
- Remove fuel rails as an assembly with injectors
- Lubricate new O-ring seals and install injectors; install rail assembly onto intake manifold
- Install fuel rail attaching screws; torque to 10 N·m (88 lb.in.)
- Install pressure regulator attaching screw; torque to 9.5 N·m (84 lb.in.)
- Connect inlet fuel line and negative battery cable
- Prime fuel system by cycling key ON and OFF
Tools required
- J 34730-1 Fuel Pressure Gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Fuel Rail Jumper Line Attaching Screws: 7 N·m (62 lb.in.)
- Fuel Rail Attaching Screws: 10 N·m (88 lb.in.)
- Fuel Pressure Regulator Attaching Screw: 9.5 N·m (84 lb.in.)
- Fuel Pressure Regulator Outlet Line Nut: 17.5 N·m (13 lb.ft.)
Source: General Motors service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.