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How to Install a New Injector in a 4 9L Ford

The most recent use of a 4.9-liter engine in Ford vehicle is in F-150 pickup trucks made from 1987 to 1996. This is a six cylinder gasoline engine, which requires the fuel injectors to deliver fuel to the engine under high pressure. The installation of a new fuel injector for a 4.9-liter Ford engine requires you to remove the entire fuel rail assembly. This procedure is generally the same for all Ford trucks with a 4.9-liter engine made since 1987.

Instructions

1

Disconnect the cable on the negative battery terminal with a socket wrench to reduce the possibility of a spark while replacing the fuel injectors. Open the filler cap on the fuel tank to relieve the pressure in the tank. Remove the cap for the fuel pressure relief valve on the fuel line and connect MFI Pressure Gauge T80L-9974-A to the valve. Open the pressure gauge to relieve the pressure in the fuel lines and replace the valve cap.

2

Disconnect the upper intake manifold assembly from the engine with a socket wrench. Remove the mounting bolts for the fuel rail and disconnect the fuel rail from the engine. Unplug the electrical connector for each fuel injector.

3

Rock the fuel injector back and forth as you pull up to remove the fuel injector from the fuel rail. Remove and discard any damaged O-rings from the fuel injector.

4

Coat the new O-rings with clean engine oil and mount them to the new fuel injector. Install the new fuel injector into the fuel rail by gently rocking it back and forth.

5

Attach the electrical connectors for the fuel injectors, and install the fuel rail with the socket wrench. Replace the upper intake manifold and connect the cable to the negative battery terminal.