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  #1  
Old 01-27-2015, 04:06 PM
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Fuel pump wiring problems

Backstory: I bought the 04 Grand cherokee with 4.0L with 136000 miles on it. It now has 150200. I have had to replace the fuel pump 4 times and the first time it was replaced the mechanic told me that it already had been replaced already, so that would make it at least 6 pumps. Before I had the pump changed the first time I blew a few fuses. The fuel pressure regulator has been changed, fuel filter changed, etc, etc. Now the jeep starts up fine and idles then when I take it out to drive about ten minutes into it, it will start to backfire and lose power. If i turn the key off and start it up once it will still run bad, but if I do it a second time it will be fine for another ten minutes or so, then repeat. Kind of like a relay has to reset. I am pretty sure it is electrical and am thinking that I should run a bypass wire from the pump to relay. I was looking at a wiring diagram and the wire goes from OR to DG/BK about a third of the way threw. Maybe that connection is bad. Don't know any ideas or is there a common fix that I'm missing?? Thanks.

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  #2  
Old 01-27-2015, 06:51 PM
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Re: Fuel pump wiring problems

Where the removed fuel pumps tested to confirm them being bad? On the road now, but will have a look into the wiring manual when home. There probably is a splice where you saw the wire color change, so that would be a good point to check.
I would also swap the fuel pump relay with an other one.
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  #3  
Old 01-27-2015, 07:01 PM
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Re: Fuel pump wiring problems

Yes 2 got tested and were either almost bad or bad. 2 were airtek cheapies and the one lasted 3 days. It was put in on monday and thursday morning it went out on me. 1700 miles later (I drove it to vegas after I picked it up, thinking it would be fine and it ended up being expensive as all h#&&.) The pump that was put in, in vegas wasn't airtek and after it went out on the way home (I just rented a uhaul and towed it home) My mechanic said that it still worked but didn't hold pressure and was weak. The 4th pump that is in there now is still working. It isn't holding the pressure in the line very well. I have to crank the engine 3 times or so in order for it start. I am so confused, I had it put on a computer and the only thing that came up was the HI/LO relay code. (which i knew I keep getting a 1489 and 1490 I just gotta put the relay on) I don't think that the fan relay will affect the way it runs though. I didn't see the actual splice. I just saw the color changes on a wiring diagram in my haynes guide. Thanks for helping.
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Old 01-27-2015, 10:20 PM
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Re: Fuel pump wiring problems

The pressure regulator in the fuel filter should keep the pressure on the fuel rail. There is however an Oīring on the fuel pump which can cause problems, there is even an TSB about it. The TSB is not for 2004 models, but if the O-ring was forgotten during assembly, it would give the same result.
You can have bad luck with just low quality pumps, or maybe the pump runs on lower then 12V due to a bad electrical connection.
I only see an orange wire on the pump module itself, the rest the wire is dark green/white (for LH drive) from the relay to the pump module connector.
There are two connectors in between, C106 and C300, which i would check for corrosion and/or moisture. Strangely enough i can only find the C106 for RHD and diesel version, not LHD.
C300 sits close the the junction block area.
I would also check the whole wire for any shaving and measure the resistance of both the supply and ground wire. There are no splices in this wire.
Attached Files
File Type: pdf Fuel pump module.pdf (147.7 KB, 6 views)
File Type: pdf Fuel pump relay.pdf (176.2 KB, 8 views)
File Type: pdf C300.pdf (129.3 KB, 7 views)
File Type: pdf tsb_wj_1400201.pdf (59.7 KB, 6 views)
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Old 01-29-2015, 12:31 AM
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Re: Fuel pump wiring problems

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Old 02-02-2015, 06:23 PM
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Re: Fuel pump wiring problems

I took it to a chrysler dealer and they told me that it was my cam sensor that was causing the problems. So when I get it back i'll drive it for a couple weeks if I can then let you know if that all works.
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Old 02-02-2015, 08:15 PM
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Re: Fuel pump wiring problems

Quote:
Originally Posted by moquinnjr View Post
I took it to a chrysler dealer and they told me that it was my cam sensor that was causing the problems. So when I get it back i'll drive it for a couple weeks if I can then let you know if that all works.
I wonder what the cam sensor has to do with fuel pumps getting bad. It sounds weird, but did they explain it?
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Old 02-02-2015, 10:23 PM
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Re: Fuel pump wiring problems

They told me it made the jeep backfire and run rough making the fuel pump work harder and draw more power. Sounds too elementary too me. It was the service guy and not the mechanic that said that though. When i get the jeep back im gonna ask questions about it. At least the pump is warrantied.


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Old 02-03-2015, 06:45 AM
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Re: Fuel pump wiring problems

Did they install an OEM fuel pump now? That a faulty cam sensor can cause injection and ignition problems i agree, but the fuel pump will not work any harder. If for any reason the fuel pump was switched on and off constantly, it would make more sense that it broke down quickly, but it is the crank sensor signal which makes the PCM switching the fuel pump on.Either way, keep us informed on how it goes.
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Old 02-05-2015, 11:54 PM
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Re: Fuel pump wiring problems

Yes It is a oem fuel pump and so far so good. Although it is a really loud pump. Whistles the entire time. Maybe thats a good thing with all the problems i had in the past with pumps. I will keep you updated on if it works or not. Im going to vegas in a week with the jeep and i havent gotten more than 1800 miles on a pump before it starts to spit and sputter. So if it lasts the trip i think my problems may be solved but time will tell.


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Old 02-24-2015, 06:18 PM
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Re: Fuel pump wiring problems

Well, I made 4500 miles with the new fuel pump and cam sensor and the jeep still runs like a dream. I can't remember where I read that the cam sensor and crankshaft sensor both work together and send a signal to the fuel pump, but I guess it's true and does affect the fuel pump. Thanks for the advice. MO
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Old 02-25-2015, 05:20 PM
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Re: Fuel pump wiring problems

Good to hear the problem is solved. Happy jeeping.
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