Loud fuel pump on long trips - JeepForum.com
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post #1 of 6 Old 03-27-2020, 02:14 PM Thread Starter
tropicalYJ
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1993 YJ Wrangler 
 
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Loud fuel pump on long trips

My 1993 4.0L has no issues firing right up, hot or cold. On my commute to work (about 7 miles each way) the fuel pump is quiet. I also take frequent long trips on top of my daily commute. During these trips, the fuel pump has a very loud hum to it that starts after about 45 minutes of driving. It gets so loud that I can hear it inside with the windows zipped up.

I've been told that a failing fuel pump will show no symptoms before it goes out. Is this one of those "turn the radio up" noises, or is my pump indeed going out?

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post #2 of 6 Old 03-27-2020, 04:59 PM
Awesome
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The YJ fuel pump is normally silent. If yours is making a lot of noise it's about to die.

The 4th 5-seater YJ in the world.
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post #3 of 6 Old 03-27-2020, 05:54 PM
JeeperDon
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Mine does that too, only on long trail days. I have no idea what it is. It's been that way for two years now.

'93 YJ, '02 GM 4.3V6, SOA, dual ARB's, 8.8+D30(WarnHubs), 4.88s, 35" BFG KM2s, AX15, NP231+4:1+SYE+2LO, York OBA, Warn M8000.
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post #4 of 6 Old 03-27-2020, 08:31 PM
Chrisnvegas
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My fuel pump is still original. Usually quiet, mine gets louder on hot days.
The fuel pump will work harder under certain circumstances. Heat mostly. It keeps the system pressurized enough to keep the fuel from vaporizing in the fuel line. Ethanol tainted (polluted) fuel vaporizes at a lower temp than clean, pure (wonderful) gasoline.

If you have any ethanol free, try it. Also if you don't know when the fuel filter has been changed, change it.

Ethanol complaints below.

ethanol costs each driver $300 per year plus damages to fuel systems.

With ethanol you:
Lose 5% of available horsepower
Lose 5% of possible fuel milage.
Lose long term storage (pure gas 2 year shelf life)

Ethanol pollutes MORE than pure gas
Ethanol causes smog.
Ethanol is a tax on every US driver to benefit a few corn producing states
Ethanol raises food prices and has claimed thousands of square miles of previously open prairie.

Yes, I HATE ethanol more than almost anything.

"Alferd Packer: “Stand up, you voracious, man-eating son of a *****, stand up! There was seven democrats in Hinsdale County and you up and ate five of them."
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post #5 of 6 Old 03-27-2020, 11:57 PM
RockWoRM
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My fuel pump died with no warning right in the middle of a freeway. Could have been 10 miles into the Rubicon!!! Royal PITA!
Not many of us carry spare pumps... everything else, but not so much pumps. I know it is $$ involved, but if you are a bit leery of the pump, I'd replace it. Lord knows your rig is quite a few years old. Good peace of mind in my book. $.o2

'05 LJR, 6sp, RC long arm w/MC 6" coils, 5.13 D44's w/chromo shafts, MetalCloak fenders/sliders/body armor, 37x12.50 MTR's, Warn 9.5, RockHard swing out w/full spare. <><
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post #6 of 6 Old 03-28-2020, 06:28 AM
JeeperDon
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Last time I pulled the tank I put a hole in the floor. I could probably swap in a new pump on the side of the road in 20 mins. I also have an old pump I rigged up to be a fuel transfer pump, couple hoses, a switch, and battery clamps. If course I never carry it, might start.
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'93 YJ, '02 GM 4.3V6, SOA, dual ARB's, 8.8+D30(WarnHubs), 4.88s, 35" BFG KM2s, AX15, NP231+4:1+SYE+2LO, York OBA, Warn M8000.
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