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Old 01-21-2014, 11:49 PM   #1
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Question I think it's the fuel pump?

Hey Forum!
So I've been boggling over this for WEEKS knowing that my symptoms could be a number of things , but tonight I think I finally figured it out. I always thought it was the fuel pump, but I was hoping in the back of my head that it was something cheaper. Instead of having a shop do a full diagnostic for 90 bucks, I decided to pick up a $20 fuel pressure guage at Harbor Freights. Sure enough, my fuel pressure was only at 27 psi the first time I tested it (30 the second time after it warmed up) Here are the other symptoms:

-I hear no noise when I turn the key (as in I dont hear the fuel pump turning on)
-The jeep loses power when given too much gas, if you feather it, it doesnt bog.
-Even when feathering it will only seem to cooperate between 2100 and 2900 rpms
-kind of bad gas mileage (but I think thats just the 4.0 showing off)

Any thoughts from you guys before I fork out the money for a new pump assembly?

I found a really cheap Airtex assembly on Amazon for half the price of Autozone, heres the link

Airtex E7115MN Fuel Pump Module Assembly : Amazon.com : Automotive

I know it being cheap is kind of sketchy, but it's being sold by Amazon itself, do you think I could print this out and bring it to Autozone or Advance Auto Parts for a price check? The part numbers check out!

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Old 01-22-2014, 12:01 AM   #2
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I've heard bad stuff about autozone pumps. Amazon also sells the Bosch pump which some one posted came with a Mopar tag on it. As for your problem I am truly unsure. I just wanted to post about those pumps as I read it days ago. And thought "oh no!" When I seen you wanted to instal one. Good luck brother.

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Old 01-22-2014, 12:32 AM   #3
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Originally Posted by Majnoon View Post
I've heard bad stuff about autozone pumps. Amazon also sells the Bosch pump which some one posted came with a Mopar tag on it. As for your problem I am truly unsure. I just wanted to post about those pumps as I read it days ago. And thought "oh no!" When I seen you wanted to instal one. Good luck brother.
Thanks, this is going to be my biggest mechanical project so far, about the bosch, it's a little more pricier. I'm trading my jeep in for a Rubicon soon, so I'm sticking with the cheaper stuff lol
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Old 01-22-2014, 12:34 AM   #4
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Sounds like the same problem i was having. After a full motor rebuild my jeep was running strong until one day i went for a drive and it ran like crap..felt very sluggish, would die out after having to hold it to the floor to get it going, and sucking down gas. I replace the crank position sensor, cleaned iac and throttle body, replaced tps, checked my cat, new alternator and battery and i still could not get it to run right. I decided a fuel pump was the only other option. Once the fuel pump was out i could see why it was running so poorly. The whole pump itself had a bunch of mud and debris all throughout the pump assembly. New fuel pump later and it runs like a champ! Id start with any cheap or free solutions first obviously and then if no fix then replace the pump
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Old 01-22-2014, 12:36 AM   #5
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And you dont have to buy the whole assembly..the assembly can be taken apart and just the pump itself replaced
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Old 01-22-2014, 12:52 AM   #6
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Originally Posted by screwystewy View Post
And you dont have to buy the whole assembly..the assembly can be taken apart and just the pump itself replaced
I'm buying the whole assembly for the price local shops are selling just the pumps for
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Old 01-22-2014, 01:07 AM   #7
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Fuel filter? you can pull that of and blow through it, that test is free. Also you can try banging on the fuel tank with a rubber mallet to see if you can hear the pump spool w/ ignition on and see if the pressure fluxuates.
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Old 01-22-2014, 07:46 AM   #8
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Originally Posted by ieatglue View Post
Fuel filter? you can pull that of and blow through it, that test is free. Also you can try banging on the fuel tank with a rubber mallet to see if you can hear the pump spool w/ ignition on and see if the pressure fluxuates.
There is no in line fuel filter, it's below the fuel pump, so I have to take the pump out anyways, might as well replace the pump while I'm in there since I'm almost 99% sure that's what it is. Thank you for your input though! I appreciate it.
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Old 01-22-2014, 12:24 PM   #9
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While you're in there, you might want to consider replacing the fuel pressure regulator too. They often wear out on TJ's and you have to crank it twice to get it started. It'd just be easy preventative maintenance since you'll be messing with the gas tank and all anyway.
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Old 01-22-2014, 12:53 PM   #10
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agree do pump and regulator as they come as a unit and either could cause low rail pressure but as he said he is replacing the whole unit he should have that covered
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Old 01-22-2014, 02:05 PM   #11
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Just ordered the fuel pump ASSEMBLY, it should be here on Friday. I'll put it in on Saturday
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Old 01-22-2014, 03:14 PM   #12
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Hopefully you're almost out of gas when you do the fuel pump. I just did a fuel pump in a buddies f150 with 3/4 of a tank in it....not fun
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Old 01-22-2014, 03:51 PM   #13
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Originally Posted by IrateDonnie View Post
Hopefully you're almost out of gas when you do the fuel pump. I just did a fuel pump in a buddies f150 with 3/4 of a tank in it....not fun

Lol I'll run it dry and screw up my current fuel pump with all of the crap in my tank, make sure it's totally destroyed before I replace it

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airtex , fuel pressure , fuel pump , fuel pump assembly , fuel tank

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