87 XJ fuel pump gets loud after extended driving - JeepForum.com

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post #1 of 4 Old 01-18-2014, 10:19 PM Thread Starter
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1996 ZJ 
Join Date: Dec 2013
Location: corona
Posts: 4
87 XJ fuel pump gets loud after extended driving

hey everyone, this is my first post so forgive me if I come out with a billion questions. But for starters I have a 1987 Cherokee with a 4.0 renix and aw4 trans. When I first turn the key to the on position I hear the pump cycle and it sounds fine, and when I start it up its nice and quiet, and will be if im just driving around town. if I drive for more than an hour non stop (especially if its hot) the pump starts to whine really loud likes its struggling or being fed to much power. I have yet to replace the filter or regulator or relay and I just wanted an opinion on what the best course of action would be.

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post #2 of 4 Old 01-19-2014, 05:51 AM
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1990 MJ Comanche 
Join Date: Oct 2009
Location: Prescott
Posts: 11,191
My guess is that the pump is dying.

As with any "new to you" vehicle, I would replace the fuel filter along with doing a bunch of cheap and simple checks before driving it alot.

Check every lube level and condition. Look for leaks.
Grease every zerk on it and check for loose u-joints.
Inspect the brake pads and shoes.

You get the idea.

If you own a Renix Jeep, you'll want to check this out.

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post #3 of 4 Old 01-19-2014, 05:54 AM
It's the crank sensor!
tjwalker's Avatar
1999 XJ Cherokee 
Join Date: Nov 2007
Location: Central Minnesota
Posts: 8,755
Originally Posted by cruiser54 View Post
My guess is that the pump is dying.
That's my guess to. Best to replace it when can control the repair than to have it die on you at the most inopportune time.......

A fresh fuel pump and filter and also a complete tuneup and replacing all fluids always a good idea for a "new-to-you" vehicle.

Enjoy your XJ!

99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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post #4 of 4 Old 01-19-2014, 08:58 AM Thread Starter
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1996 ZJ 
Join Date: Dec 2013
Location: corona
Posts: 4
thanks for the replies guys, but damn, well I guess it would be best to replace it now then be stuck somewhere. any suggestions on what pump is best? the nearest auto parts store is autozone and they sell only airtek and ive had really bad luck with them
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