Stalling problem
Thread Starter
Newbie
Joined: Sep 2016
Posts: 24
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From: North Carolina
Year: 1987
Model: Cherokee
Engine: 4.0 l6
Stalling problem
I just replaced my fuel pump and sending unit on my 87 xj and now it keeps stalling out. If I’m on the highway and up to speed, it does fine. But when I’m at low rpm it cuts off but it cranks right back up every time. What’s causing this? Could there be air or trash in the line that’s causing it to cut out?
Last edited by Ryan Riddle; Jul 28, 2018 at 11:07 AM.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
I just replaced my fuel pump and sending unit on my 87 xj and now it keeps stalling out. If I’m on the highway and up to speed, it does fine. But when I’m at low rpm it cuts off but it cranks right back up every time. What’s causing this? Could there be air or trash in the line that’s causing it to cut out?
Did you replace the fuel filter at the same time? If not, you shoulda.
Little bit off-topic, but you should go to www.cruiser54.com and complete tips 1 through 5 ASAP.
Thread Starter
Newbie
Joined: Sep 2016
Posts: 24
Likes: 0
From: North Carolina
Year: 1987
Model: Cherokee
Engine: 4.0 l6
Did you replace the fuel filter at the same time? If not, you shoulda.
Little bit off-topic, but you should go to www.cruiser54.com and complete tips 1 through 5 ASAP.
Little bit off-topic, but you should go to www.cruiser54.com and complete tips 1 through 5 ASAP.
Seasoned Member
Joined: Mar 2015
Posts: 251
Likes: 14
From: SE MA
Year: 1987
Model: Cherokee
Engine: 4.0L
My '87 does not, but does yours have a fuel pump ballast resistor? If so, try bypassing it temporarily. When starting, it's bypassed via the ignition switch, but the pump is powered by the resistor while running normally. My thought is to see if its a current issue with the new pump.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
My '87 does not, but does yours have a fuel pump ballast resistor? If so, try bypassing it temporarily. When starting, it's bypassed via the ignition switch, but the pump is powered by the resistor while running normally. My thought is to see if its a current issue with the new pump.
Great suggestion.
Seasoned Member
Joined: Mar 2015
Posts: 251
Likes: 14
From: SE MA
Year: 1987
Model: Cherokee
Engine: 4.0L
I think the fuel pump ballasts started mid-'87. And, if I recall, wasn't there a TSB around late '87 to '88 that the dealer could install one? I think it required changing the pins of a relay so the DRB would see the change as an '88 model year... or something to that nature.
What brand is the filter? Is the rubber line from the tank to the filter partially kinked? Did crap get in it and clog it? When I replaced my pump, I also replaced all the rubber hoses (as well as the tank, filler neck and roll-over valves... due to the tank was leaking as a result of age). My point is it wouldn't hurt to replace the hose due to age anyway. I don't think it's a vapor-lock issue in the tank as the fuel is mostly returned, and there (when new) was a light vacuum on the tank for vapors to be drawn to the carbon canister for burning later.
I'll think some more.
What brand is the filter? Is the rubber line from the tank to the filter partially kinked? Did crap get in it and clog it? When I replaced my pump, I also replaced all the rubber hoses (as well as the tank, filler neck and roll-over valves... due to the tank was leaking as a result of age). My point is it wouldn't hurt to replace the hose due to age anyway. I don't think it's a vapor-lock issue in the tank as the fuel is mostly returned, and there (when new) was a light vacuum on the tank for vapors to be drawn to the carbon canister for burning later.
I'll think some more.
Last edited by ajpulley; Jul 30, 2018 at 06:32 PM.
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::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
I think the fuel pump ballasts started mid-'87. And, if I recall, wasn't there a TSB around late '87 to '88 that the dealer could install one? I think it required changing the pins of a relay so the DRB would see the change as an '88 model year... or something to that nature.
What brand is the filter? Is the rubber line from the tank to the filter partially kinked? Did crap get in it and clog it? When I replaced my pump, I also replaced all the rubber hoses (as well as the tank, filler neck and roll-over valves... due to the tank was leaking as a result of age). My point is it wouldn't hurt to replace the hose due to age anyway. I don't think it's a vapor-lock issue in the tank as the fuel is mostly returned, and there (when new) was a light vacuum on the tank for vapors to be drawn to the carbon canister for burning later.
I'll think some more.
What brand is the filter? Is the rubber line from the tank to the filter partially kinked? Did crap get in it and clog it? When I replaced my pump, I also replaced all the rubber hoses (as well as the tank, filler neck and roll-over valves... due to the tank was leaking as a result of age). My point is it wouldn't hurt to replace the hose due to age anyway. I don't think it's a vapor-lock issue in the tank as the fuel is mostly returned, and there (when new) was a light vacuum on the tank for vapors to be drawn to the carbon canister for burning later.
I'll think some more.
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