Loud fuel pump, fuel ballast resistor deleted

[mark corbitt]

The fuel ballast resistor on my 87 has been deleted, and my fuel pump runs loudly all the time. My question is where are the wires that i need to find in order to put a resistor back in and quiet the fuel pump?I bought 2 new ballast resistors so i will have a spare, in case i have a problem. Thanks in advance for your advice.

[krustyballer16]

Beside the air box. Kinda right above it on the inner fender.

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[87MJTIM]

The 87 did not come from the factory with a ballast resistor.  However, there was a TSB to add a ballast resistor to address the noisy fuel pump.  Your resistor may not have been deleted; your truck may never have had one.

 

I have an 87 XJ that had a ballast resistor added.

[mark corbitt]

I looked at pics of the area where the ballast resistor is located, and my truck has 3 wires going to the grounding bolt there. 2  of them come out of the main wiring harness. If i am going to add a new resistor should i wire it in close to the fuel pump by the gas tank, and if so, how do i go about doing that?

Edited December 5, 2019 by mark corbitt
mistake

[87MJTIM]

19 minutes ago, mark corbitt said:

I looked at pics of the area where the ballast resistor is located, and my truck has 3 wires going to the grounding bolt there. 2  of them come out of the main wiring harness. If i am going to add a new resistor should i wire it in close to the fuel pump by the gas tank, and if so, how do i go about doing that?

 That is Jeep's way of grounding engine compartment components in one location.  One of the wires is for the blower fan FROM THE PASSENGER SIDE of the engine compartment.  See Cruiser's tips to ground the blower to the passenger side.

[mark corbitt]

2 minutes ago, 87MJTIM said:

 That is Jeep's way of grounding engine compartment components in one location.  One of the wires is for the blower fan FROM THE PASSENGER SIDE of the engine compartment.  See Cruiser's tips to ground the blower to the passenger side.

Thanks, i already did that, Cruiser is a godsend to all of us MJ owners.

[87MJTIM]

1 minute ago, mark corbitt said:

Thanks, i already did that, Cruiser is a godsend to all of us MJ owners.

[cruiser54]

How noisy is the fuel pump? Even without a ballast resistor, my fuel pumps were not very loud.

I'd be suspicious of the pump. 

 

Have you done the fuel pump ground upgrade? 

[mark corbitt]

The pump is very loud, and yes, i recently re-finished my tail-light lenses and added an additional ground wire to the drivers rear ground as you suggested. I was hoping it would help, but it made no difference in the loudness of the pump. 

[Comanche1]

Is there a Napa part number for ballast resister?

[cruiser54]

Your pump is junk......

 

The extra noise they made was barely noticeable when new to anyone who didn't have exceptional hearing. It was a hissing sound that mostly only women could hear. 

 

You're barking up the wrong tree. 

[mark corbitt]

On 12/10/2019 at 8:59 AM, cruiser54 said:

Your pump is junk......

 

The extra noise they made was barely noticeable when new to anyone who didn't have exceptional hearing. It was a hissing sound that mostly only women could hear. 

 

You're barking up the wrong tree. 

Which replacement pump do you reccomend?

[JMO413]

10 hours ago, mark corbitt said:

Which replacement pump do you reccomend?

Bosch for the win! That seems to be the consensus as for one that actually fits and lasts.

[eaglescout526]

I think there's a NOS pump left but for how much it costs you do not want it. But yes Bosch was the OEM supplier