Loud humming, fuel pump?

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Jun 9, 2012 | 08:16 AM

#31

Johnthepanpire

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Joined: Mar 2012

Posts: 187

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From: Las Vegas, Nevada

Year: 1990

Model: Cherokee

Engine: 4.0L 6Cyl L8

Do 90's have a ballast resistor?

Jun 9, 2012 | 08:26 AM

#32

Johnthepanpire

Member

Joined: Mar 2012

Posts: 187

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From: Las Vegas, Nevada

Year: 1990

Model: Cherokee

Engine: 4.0L 6Cyl L8

I'm having the same problem with speeds above 40. Once it gets there it feels like it's starved for power. I almost have to put the pedal to the floor on hills with little response. Any speeds below that throttle response is great.

Jun 9, 2012 | 10:01 AM

#33

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,579

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Yes, 90s have a ballast resistor.

Jun 9, 2012 | 02:06 PM

#34

Johnthepanpire

Member

Joined: Mar 2012

Posts: 187

Likes: 0

From: Las Vegas, Nevada

Year: 1990

Model: Cherokee

Engine: 4.0L 6Cyl L8

Could the fuel pump be the reason for the lack of power?

Jun 9, 2012 | 03:22 PM

#35

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,579

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Absolutely.

Jun 12, 2012 | 02:13 PM

#36

Johnthepanpire

Member

Joined: Mar 2012

Posts: 187

Likes: 0

From: Las Vegas, Nevada

Year: 1990

Model: Cherokee

Engine: 4.0L 6Cyl L8

Ok ordered a new pump yesterday but the has gauge has been acting up too. I can sit at a stop light and watch the gauge go down a quarter tank! Do I need a sending unit also? Because I can't find one anywhere...

And it's not leaking or using the gas, when it's first started it shows the actual reading.

Jun 12, 2012 | 08:52 PM

#37

Johnthepanpire

Member

Joined: Mar 2012

Posts: 187

Likes: 0

From: Las Vegas, Nevada

Year: 1990

Model: Cherokee

Engine: 4.0L 6Cyl L8

Any suggestions?

Jun 12, 2012 | 09:12 PM

#38

cookrw

Seasoned Member

Joined: Feb 2012

Posts: 369

Likes: 0

From: Oxford, OH

Year: 1996

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by Johnthepanpire

I think the gauge Seder is integrated with the pump, if you bought a whole new assembly and not a "universal" pump...

Jun 12, 2012 | 09:22 PM

#39

Johnthepanpire

Member

Joined: Mar 2012

Posts: 187

Likes: 0

From: Las Vegas, Nevada

Year: 1990

Model: Cherokee

Engine: 4.0L 6Cyl L8

Quote:

Originally Posted by cookrw

I think the gauge Seder is integrated with the pump, if you bought a whole new assembly and not a "universal" pump...

I couldn't find a complete pump/sender assembly for the 12 gallon tanks. Only pumps.
And I couldn't find the sender by it self either, only universal top mounts and mine is on the side.

Jun 12, 2012 | 09:45 PM

#40

Johnthepanpire

Member

Joined: Mar 2012

Posts: 187

Likes: 0

From: Las Vegas, Nevada

Year: 1990

Model: Cherokee

Engine: 4.0L 6Cyl L8

This is the one I ordered
http://www.rockauto.com/catalog/moreinfo.php?pk=3097218

Attached Images

Oct 29, 2018 | 11:27 AM

#41

prerunner1982

CF Veteran

Joined: May 2008

Posts: 2,495

Likes: 3

From: Edmond, OK

Year: 1993

Model: Cherokee

Engine: 4.0 ltr

Quote:

Originally Posted by prerunner1982

my fuel pump has hummed since I got it... 4 or 5 years ago. The previous owner said it had been humming for a couple years prior to that. knock on wood. I been told a couple times to run some transmission fluid through the tank and it will lube the pump and quiet it down. Haven't tried it yet.

I parked this XJ in 2015, just resurrected it last week...same pump still hums.

Been humming along for at least 15yrs if PO was honest.

I may change it soon.

Jan 24, 2022 | 02:32 PM

#42

EuroJeep

Member

Joined: Apr 2019

Posts: 236

Likes: 8

From: France

Year: 1987

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by swells

I just discovered on my jeep there is no charcole canister so the vent line from the tank was crimped shut so I re-cut the metal line and ran it into the the intake. and now the pump is much quieter.

old thread, but I have this noisy fuel pump hum on a 4.0 87.
And I aslo don’t have a charcoal canister.

can someone explain the link betwin the noise and the canister.

because the noise is spoiling my pleasure to drive

Jan 24, 2022 | 10:27 PM

#43

ajpulley

Seasoned Member

Joined: Mar 2015

Posts: 251

Likes: 14

From: SE MA

Year: 1987

Model: Cherokee

Engine: 4.0L

Quote:

Originally Posted by EuroJeep

old thread, but I have this noisy fuel pump hum on a 4.0 87.
And I aslo don’t have a charcoal canister.

can someone explain the link betwin the noise and the canister.

Most ‘87 model-year 4.0L Cherokees did not have a ballast resistor to quiet the pumps some. Mine does not, and it is not that loud. The original was still running when I replaced the fuel tank two years ago.

And, there is no corolation with the evaporative canister… It was under the hood when it left the assembly line.