Hi dave i have a 1993 jeep cheroke, i went to start it and it would only run 3 sec. replaced the fuel filter and then it would rev up to 1500 and slowley come back down, then choke itself out. now it

bullofthe
30

Asked by bullofthe Nov 13, 2013 at 09:07 PM about the 1993 Jeep Cherokee 4 Dr Sport 4WD SUV

Question type: Maintenance & Repair

Hi dave i have a 1993 jeep cheroke, i went to start it and it would only run 3 sec. replaced the fuel filter and then it would rev up to 1500 and slowley come back down, then choke itself out. now it only runs 10 sec, i have replaced the fuelpump and regulator, i noteced when it is running i can not hear the fuel pump. and the fuel pressure is never above 7 psi with the return line closed. any ideas?  Ben

6 Answers

tennisshoes
36,245

Fuel pressure is 31 to 35 for a 4.0 engine, so 7 is too low.

2 out of 2 people think this is helpful.
bullofthe
30

I know but I can't get it over that with it running. It's almost like the fuel pump shuts off while it's running, and right before it dies it turns on and then shuts off.

tennisshoes
36,245

Find your fuel pump relay and jumper the power feed directly to the fuel pump power wire, this should make your fuel pump run continuously, now test your pressure, it should be at specs, try to start the engine, if it starts and runs then you need to track down the problem with the pump circuit, if you have a low oil pressure fuel cut off then that is where to start as it could be open or you have an oil pressure problem.

bullofthe
30

I have tried jumping it and it works but if you start it leaving it jumped does nothing, and for the oil pressure it has a single wire sensor, so it would not be switched, unless their is another one I do not know about.

tennisshoes
36,245

If you jump the fuel pump relay and the pump still won't make pressure then the pump is either bad or the wrong one.

bullofthe
30

I have found the problem! It was a ceramic resister that controls the fuel pump after start up it lowers the voltage to the pump so the pump lasts longer and it is not in any repair manuals, took 3 hrs of looking at online diagrams.

3 out of 3 people think this is helpful.

Your Answer

Add photo

Related Questions

Cherokee
Looking for a Used Cherokee in your area?
CarGurus has 44,756 nationwide Cherokee listings starting at $1,295.
ZIP:

Search Jeep Cherokee Questions

Jeep Cherokee Experts

#1 Tom Demyan
Tom Demyan
Reputation 420
#2 dandyoun
dandyoun
Reputation 400
#3 JimRoy
JimRoy
Reputation 280
View All

Related Models For Sale

Used Jeep Grand Cherokee"
1,218 Great Deals out of 55,049 listings starting at $1,650
Used Jeep Wrangler"
724 Great Deals out of 45,898 listings starting at $1,800
Used Toyota 4Runner"
352 Great Deals out of 10,133 listings starting at $2,500
Used Ford Explorer"
1,006 Great Deals out of 46,716 listings starting at $2,000
Used Honda Civic"
1,047 Great Deals out of 60,607 listings starting at $1,200
Used Ford Mustang"
689 Great Deals out of 34,374 listings starting at $1,950

Used Cars For Sale

2015 Jeep Cherokee For Sale
38 Great Deals out of 40,696 listings starting at $19,888
2014 Jeep Cherokee For Sale
138 Great Deals out of 3,330 listings starting at $15,295
2001 Jeep Cherokee For Sale
9 Great Deals out of 184 listings starting at $2,500
2000 Jeep Cherokee For Sale
156 listings starting at $2,495