Fuel pump relay location

Tiny
AVJ
  • MEMBER
  • 2000 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 105,000 MILES
Started and stopped running within a few seconds. Can't hear the fuel pump run when I turn the key before attempting to start it. Is there a fuel pump relay? Could that be the problem? Or should I try replacing the fuel pump? I have had crank position sensor problems on my previous 2 Jeeps, but I don't remember if the fuel pump ran when I had the crank sensor problems. Any Ideas?
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Saturday, September 26th, 2009 AT 8:10 PM

44 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hello,

The relay is located under the hood here is a guide to help you test it and the location in the diagrams below.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check and test the fuse no.22 15 amp and fuel pump relay.
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Saturday, September 26th, 2009 AT 8:27 PM
Tiny
JIM_SANDRA
  • MEMBER
  • 1 POST
  • 1995 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 16,000 MILES
I recently removed my engine for repair it now installed and begining to try it but my fuel pump relay is clicking constantly what suggestions do yuo have for me too check
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
The clicking of the relay, would mean a good relay, I think your problem is the fuel pump
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
JVANSANT
  • MEMBER
  • 6 POSTS
  • 1993 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 104,000 MILES
Was driving it and it quit running. Had it towed. Key on sends 12V to the fuel pump for just a brief second, but does not energize fuel pump. Of course, I replaced pump and filter. Still no fuel pump engagement. The fuel pump will run if I put 12 V to it, but I am not able to get it to prime and send fuel to the rail, tank is about 1/4 full. Back to the real problem. I do not have 12V to the fuel pump except for a few milliseconds. I have checked ALL the fuses (3 times, because sometimes I am stupid), I have replaced the fuel pump relay. The fuel pump relay has always made an audible click indicating mechanical function. I pulled the PCM, ECM or whet ever it is defined as on this particular vehicle. There was some pretty visible corrosion on, maybe 2 or 3 pins, cleaned this up w/dental picks, elect parts cleaner and compressed air. Still no fuel pump. I would literally have to tear this car apart to trace the wire from the fuel pump to the power center. I have a Haynes manual which is for all intents and purposes useless in this instance. If I had a good wiring diagram or just the info to pin it out I might be able to figure it out. I found a Jeep 1993-94 2.5 and 4.0L EFI powertrain Diagnostics factory service manual. Would this manual provide the info. I need to further diagnose this vehicle? Any help would be greatly appreciated. Thanks, John V.
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Try swapping the ASD (auto shutdown relay) with another one (a/c) and see if that will work. If the PCM doesnt power up, the rest of the system wont work properly
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
JVANSANT
  • MEMBER
  • 6 POSTS
Just to keep everybody posted. The brand new Airtex fuel pump assembly was bad and that's why I couldn't get it to pump/prime. Installed a new pump assy, but of course still no power to the pump, except for just a brief second when the ignition key is first turned on. Vehicle runs perfectly when I hot wire the fuel pump. Anyone have any suggestions? John V.
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
JVANSANT
  • MEMBER
  • 6 POSTS
Oh, replacing both the ASD and fuel pump relays was the very first thing that had I tried. John V.
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
John, I need to know exactly which Cherokkee you have. There are 7 different versions
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
SHADONNIE
  • MEMBER
  • 3 POSTS
  • 1989 JEEP CHEROKEE
  • 204,000 MILES
Replaced fuel pump, drove jeep a few times in town. Now jeep will not start. Fuel pump relay is working fine but pump is not kicking on?
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
JVANSANT
  • MEMBER
  • 6 POSTS
I finally resolved the fuel pump problem on this Jeep Cherokee. It is a 1993 Cherokee Sport 2 door. It has a 4.0 litre 6cyl, auto, air, 4wd. I purchased the factory service manual, I traced the fuel pump circuit and discovered that I was losing power at the "fuel pump ballast resistor" It is my understanding that this is put in the circuit to reduce fuel pump voltage and thereby noise, under normal driving conditions but is bypassed by the ECM and a "bypass relay" under WOT conditions. The service manual did not give a spec for this resistor but it ohmed out at 78ohms. Seemed kind of high to me. Tried to find the part, but nobody (not even the dealer)knew what I was talking about. I bypassed it, everything worked great. Finally found the part and, new, it had exactly 1.1ohms of resistance. Replaced the bad resistor now everything is peachy. John V.
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
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Did you flush the tank when you replaced the pump?

Roy
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
FUZGA2
  • MEMBER
  • 2 POSTS
John,

I too have the 1993 Jeep Cherokee Sport, 4dr, 4.0L and 6cy. Our problem is very similar I repalced the fuel pump and the fuel filter. Just can't get the fuel going into the line, the fuel is running and measured at the connector to the fuel pump, I am getting only 6.832 VDC. Tried the bypass on the resistor, still won't work and the ballast resistor measured at 1.5 ohms.

With all the experiences that you had on this problem, may be you can shine some light to this.

Dennis
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
SHADONNIE
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  • 3 POSTS
No I did not.
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
JVANSANT
  • MEMBER
  • 6 POSTS
Well Dennis, you need to figure out where you have 12v. In the fuel pump circuit, then where you're losing it. 12v. Should be going to the fuel pump for 1 sec. When the ignition is turned on or constantly when the starter is turning the engine over or when the engine is running. I would confirm that the fuel pump is working by VERY CAREFULLY jumping 12v. Directly to the fuel pump to see if it pumps fuel and runs (make sure that you have correct polarity). If that works get a 12v.(Dc) buzzer or light then see if or when you actually get 12v back to the fuel pump. If you don't want to trace the circuit and just punt, I would clean every ground and plug connector in the F.P. Circuit, I would check and clean the big ECM connector, I would replace the fuel pump relay and I would eliminate the ballast resistor. If you truly have a 1993 I could probably help you out w/a factory wiring diagram (if your patient). Good Luck. JohnV
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
This may be the reason for the first failure as well as the current failure. Dirt can lock up a pump new or not in a matter of hours.

Consider the tank is over 20 years old and needs to be flushed

Roy
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
DEJEEPGUY
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  • 1 POST
I have been working on my 93 Cherokee because it has the exact same problem. I've done the same things you have so far. Where is this ballast resistor? It sounds like that is the problem in my vehicle too. Where did you find this part? Or did you just find a 1.1ohm resistor and replace the piece? Currently I just have the fuel pump hot wired with an in-line fuse holder and I'd really like to get this solved.
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
SHADONNIE
  • MEMBER
  • 3 POSTS
Makes sense. Iam sure dirt particles could get thru the strainer. Thank you
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
RUDINSKI852
  • MEMBER
  • 1 POST
  • 1989 JEEP CHEROKEE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
Jeep starts fine sometimes, runs, restarts.
Sometimes will start, but not stay running. Found little to no fuel in injector bar valve when this happens. When it runs, plenty of fuel present.

If I need to replace fuel pump or relay, where is the fuel pump physically located on the gas tank?

Do I need to drop the tank? I just filled it up before this problem started so it's going to be heavy with fuel.

Is there any tests I can do to find out if fuel pump is the cuprit?

Help!

Rudinski@verizon. Net
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
JVANSANT
  • MEMBER
  • 6 POSTS
The ballast resistor is located on the drivers side fender. It is a piece of white ceramic material mounted to the fender with a sheet metal screw, has 2 spade terminals, is essentially rectangular. I don't really believe it is needed in the circuit for the fuel pump to operate properly. You can just jump it out and leave it like that. The resitor reduces the voltage to the fuel pump under NOC to extend fuel pump life and reduce fuel pump noise. Any knowledgable Jeep dealer should be able to provide this part. John V.
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Monday, March 11th, 2019 AT 3:04 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
If the pump is running but creating low pressure it is probably the pump. Yes it is located in the fuel tank . You will need to siphon the gas out.You will need to verify fuel pressure or lack of at theengien with a gauge (see video). If you do replace the pump, it is a good idea to change the filter and relay

https://www.2carpros.com/dia/test_fuel_pressure.htm
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Monday, March 11th, 2019 AT 3:04 PM (Merged)

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