Jeep Lost it's power
Thread Starter
CF Veteran
Joined: Sep 2007
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those are new
Thread Starter
CF Veteran
Joined: Sep 2007
Posts: 4,869
Likes: 14
OKAY
narrowed down my issue here
fuel pressure is at 38 running
stock calls for 49 + or - 5 psi
so its a fuel delivery issue
is it safe to say it's my fuel pump or are there a couple more things i could be checking
can't be the regulator as that would give me too much pressure correct?
narrowed down my issue here
fuel pressure is at 38 running
stock calls for 49 + or - 5 psi
so its a fuel delivery issue
is it safe to say it's my fuel pump or are there a couple more things i could be checking
can't be the regulator as that would give me too much pressure correct?
MJ>XJ
Joined: Mar 2009
Posts: 17,836
Likes: 7
From: Griffin, G.A.
Year: 1990
Model: Comanche
Engine: 4.0 I6
i thought it was 39psi with the regulator vacuum line connected... and 49 with it disconnected? ill look that up again... other wise.. fuel strainer... in the tank... pinched line... clogged line... bout it... this test with vacuum and without vacuum will also tell you if your regulator is bad...
Last edited by huntingman2706217; Oct 3, 2009 at 04:12 PM.
MJ>XJ
Joined: Mar 2009
Posts: 17,836
Likes: 7
From: Griffin, G.A.
Year: 1990
Model: Comanche
Engine: 4.0 I6
here... this is on a 95... i had mine checked on my 96 and he gave me the paper work on it from Alldata... and above is what i remembered it as but dont quote me on that... this is what i found... theres more to it then just 49psi give or take...
http://www.naxja.org/forum/showthread.php?t=1008253
http://www.naxja.org/forum/showthread.php?t=1008253
Last edited by huntingman2706217; Oct 3, 2009 at 04:09 PM.
MJ>XJ
Joined: Mar 2009
Posts: 17,836
Likes: 7
From: Griffin, G.A.
Year: 1990
Model: Comanche
Engine: 4.0 I6
in the picture on the first page... wont let me quote it... on my old chevy and really old honda... thats a ballast resistor... didnt have anything to due with fuel i dont think?
MJ>XJ
Joined: Mar 2009
Posts: 17,836
Likes: 7
From: Griffin, G.A.
Year: 1990
Model: Comanche
Engine: 4.0 I6
well thats good! weird but good! lol... strainer must have been clogged up or the pump was... pumps either work or dont work... and most of the time they fail after its been shutoff not just going down the road or something... had to be a clog in there somewhere...
CF Veteran
Joined: Nov 2008
Posts: 2,473
Likes: 9
From: Paso Robles Ca
Year: 1991
Model: Cherokee
Engine: 4.0
on start up it bypassed then switches over and runs the pump on lower voltage
if your pump is getting week you can bypass it to run it full speed
its a way to see if the pump is going bad cus you will gain power back
Thread Starter
CF Veteran
Joined: Sep 2007
Posts: 4,869
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well so much for that LOL
jeep ran fine, filled the tank with gas
and about 10 miles later i threw 3 rods in the motor, cracked the block fuel line by the firewall ruptured, fuel sprayed all over the header, jeep caught on fire, melted the main wiring harness.
jeep ran fine, filled the tank with gas
and about 10 miles later i threw 3 rods in the motor, cracked the block fuel line by the firewall ruptured, fuel sprayed all over the header, jeep caught on fire, melted the main wiring harness.
CF Veteran
Joined: Nov 2008
Posts: 2,473
Likes: 9
From: Paso Robles Ca
Year: 1991
Model: Cherokee
Engine: 4.0
that sucks!!
Registered Users
Joined: Jul 2009
Posts: 850
Likes: 0
Year: 91 with lots of 01' parts
Model: Cherokee
Engine: 01' 4.0L
