Jeep I6 MPFI O-ring relacement By Ravonthe4x4ram

[Dodgeboy426]

This How-To will show you how to replace the fuel injector o-rings on a Jeep 4.0 liter.

Tools needed:

* Standard screwdriver or valve bleeder tool.
* Ratchet and extension with � in or 13 mm socket.
* Rags to catch gasoline when releasing fuel pressure.

As with ever thing disconnect the battery leads. (Figure 1)


(Figure 1)


Remove gas cap. (Figure 2)


(Figure 2)


Here is the release valve for the fuel rail. You can use a screwdriver to release the pressure in the system. I will tell you the fuel will go everywhere, but in the time it takes you to do the repair it will dry up. This is like letting air out of a tire. (Figure 3)


(Figure 3)


Unbolt the four bolts attaching the rail. They are like the one you see in this picture. (Figure 4)


(Figure 4)


Disconnect the vacuum hose and disconnect the fitting. (Figures 5 and 6)


(Figure 5)



(Figure 6)


Disconnect the harness from the injectors. Use tabs on the sides to release. Label the connectors to which injector they came off. (Figure 7)


(Figure 7)


Disconnect the back fitting. (Figures 8 and 9)


(Figure 8)



(Figure 9)


If all is disconnected properly you should be able to pull the rail straight out. (Figure 10)


(Figure 10)


Here is a picture of one of the injectors. Just for peace of mind I would replace all 6 o-rings so you don�t have to repeat this process. (Figure 11)


(Figure 11)


Firmly press rail back into intake and make sure the injectors are firmly seated in. Reattach all fittings, bolt the rail back in, attach the harness connections on the back of the injectors, and make sure the vacuum line is reattached. (Figure 12)


(Figure 12)


Put gas cap back on, reconnect the battery, and wait for system to regain pressure. You are now finished.