Fuel Rail & Fuel Injectors: Installation

Install NEW insulators and NEW grommets on fuel injectors. Coat NEW "O" rings with gasoline and install on fuel injectors.
Using twisting motion, installing fuel injectors on fuel rail. Ensure spacers are installed on intake manifold. Install fuel rail with fuel rail-to-intake manifold bolts loosely installed.
Ensure fuel injectors rotate smoothly. If fuel injectors fail to rotate smoothly, check for improper "O" ring installation. Ensure electrical connector on each fuel injector is facing upward, toward top of engine.
Tighten fuel rail-to-intake manifold bolts to specification. See TORQUE SPECIFICATIONS .
To install remaining components, reverse removal procedure using NEW gaskets and NEW "O" rings. Tighten bolt/nuts and fuel pulsation damper to specification. See TORQUE SPECIFICATIONS .
Ensure Dark Gray electrical connectors are installed on fuel injectors on cylinders No. 1, 3 and 5, and the Brown electrical connectors are installed on fuel injectors on cylinders No. 2, 4 and 6. Operate fuel pump and check for fuel leaks. See FUEL PUMP OPERATION under FUEL SYSTEM in appropriate BASIC TESTING article.

Fig 1: Exploded View Of Fuel Rail & Components (Non-Turbo)

To install, reverse removal procedure using NEW "O" rings, NEW insulators and NEW gaskets. Coat "O" rings with gasoline before installing "O" rings on fuel injector. Use twisting motion when installing fuel injector on fuel rail.
NOTE: Fuel injectors must be properly positioned in fuel rail. All fuel injectors except the end fuel injector next to the fuel pressure regulator should be positioned in fuel rail with electrical connector on fuel injector facing upward, toward fuel pressure regulator side of fuel rail. The end fuel injector next to fuel pressure regulator should be positioned with electrical connector on fuel injector facing downward, away from fuel pressure regulator side of fuel rail.
Ensure NEW insulator is installed on top of each fuel injector before installing fuel injector holder. Tighten fuel injector holder bolts to specification. See TORQUE SPECIFICATIONS .
Ensure spacers are installed on intake manifold. Tighten fuel rail-to-intake manifold bolts to specification. See TORQUE SPECIFICATIONS .
NOTE: Ensure Dark Gray electrical connectors are installed on fuel injectors on cylinders No. 1, 3 and 5, and the Gray or Brown electrical connectors are installed on fuel injectors on cylinders No. 2, 4 and 6.
To install remaining components, reverse removal procedure. Tighten air intake chamber bolts/nuts evenly to specification using several steps. See TORQUE SPECIFICATIONS .
Apply engine oil on "O" ring for engine oil dipstick tube assembly or ATF for on dipstick tube assembly for A/T before installing. Operate fuel pump and check for fuel leaks. See FUEL PUMP OPERATION under FUEL SYSTEM in appropriate BASIC TESTING article.