2000 TJ 4.0L fuel injectors

While I am also interested in the expected life expectancy of the injectors
is it worthwhile to incur the expense of changing them before failure?

There was a post several days ago where someone was unable to find the
grounds in his engine compartment. While I was down photographing them I
decided, for some reason, to check the pressure in my fuel rail. As I
hooked up the gauge I got no leakage so I am assuming that all the pressure
had leaked down. I turned on the key for a few seconds and then turned the
ignition off and removed the key. The pressure gauge was now set on 50 psi
and stayed there for the duration of the photography and removal of
leaves/needles from the cowling and inspection of the wiper blades. When I
removed the gauge, still at 50 psi, I did get fuel spillage.

How long will the fuel rail hold pressure? I know for sure I drove the
Cherokee Sunday but I think it may have sat several days since then.


<Matt Osborn> wrote in message
...
>I have 110,000 miles on my TJ and am losing what I assume to be fuel
> rail pressure when parked for a few hours. Before starting the
> engine, I leave the ignition in the on position for a few seconds
> before cranking the starter. The engine always starts promptly when I
> do this.
>
> Before running up the maintenance bills, cleaning the injectors,
> replacing o-rings, etc., I thought it might be better to simply
> replace the injectors.
>
> I guess what I'm asking is if fuel injectors 'wear out'. That is, how
> long will a set of injectors last?
>
>
> -- msosborn at msosborn dot com

Billy Ray did pass the time by typing:

> How long will the fuel rail hold pressure? I know for sure I drove the
> Cherokee Sunday but I think it may have sat several days since then.

On a new engine, days.
Test threshold is less than a 20psi drop in 30min.
Mine still has about 10psi in it after sitting all night
and that's a 93

--
DougW