Fuel injector leakage after replacing o-rings

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Feb 5, 2012 | 05:52 AM

#16

Programbo

CF Veteran

Joined: Jan 2009

Posts: 1,964

Likes: 6

From: Baltimore, Maryland

Year: 1994 1993

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by rrich

Think about it - the O rings don't seal fuel in, there's no liquid fuel even near them. They seal outside air from getting in.
If it leaks fuel, the body of the injector is cracked - no fixing that, just replace.

What o-rings are you talking about? The ones on the tops of the injectors seal a LOT of fuel pressure in.

Feb 5, 2012 | 07:42 AM

#17

rrich

Senior Member

Joined: Aug 2011

Posts: 760

Likes: 6

From: Landers, CA

Year: Several

Model: Cherokee

Engine: 4.0

The fuel is INSIDE THE BODY OF THE INJECTOR, not the outside where the O rings are!

Feb 5, 2012 | 08:43 AM

#18

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,578

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

The way I see it the upper o-ring seals fuel to the rail and the lower o-ring seals air to the intake manifold.

Feb 5, 2012 | 11:12 AM

#19

maddogs1965

Member

Joined: Jan 2012

Posts: 108

Likes: 0

From: Truckee Ca,

Year: 1991

Model: Cherokee

Engine: 4.0 H.O.

Quote:

Originally Posted by rrich

Think about it - the O rings don't seal fuel in, there's no liquid fuel even near them. They seal outside air from getting in.

If it leaks fuel, the body of the injector is cracked - no fixing that, just replace.

I think maybe YOU NEED TO THINK ABOUT IT!!!!! If the Upper O ring on the injector rail starts leaking, you are going to have fuel every were, not only do they seal the air from coming in, but the fuel from coming out.

Last edited by maddogs1965; Feb 6, 2012 at 07:19 PM.