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Unread 02-21-2014, 12:14 PM   #1
RedRockRed
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2010 JK Wrangler 
 
Join Date: Jan 2014
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Fuel Pump Noise; resonance or pressure

The fuel pump in my YJ (89 w/2.5) hums loud enough to be plainly heard while driving. The noise stops a few seconds after the ignition is turned on if the engine isn't running. Engine starts and runs great; no sign of fuel injection issues. Is this a fuel pressure problem or a noise transmission issue? I don't want to mess with the TBI when its running so nice except for the pump buzz.

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Unread 02-21-2014, 12:19 PM   #2
grandboost98
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1989 YJ Wrangler 
 
Join Date: Aug 2010
Location: Durham/East Haven, CT
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Leave it alone. Mine did for years until it finally gave up at 230k. The aftermarket pump is much quieter
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Unread 02-21-2014, 01:02 PM   #3
Que89YJ
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1989 YJ Wrangler 
 
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It means your fuel pump is begining to wear out. If it is your DD then you might want to take a proactive step and replace it. If Not hen what Grandboost said. There are some options if you decide to replace it. You can find and drop in a poly tank from a 91-95 with the skid and tank and pickup an extra 5 gallons.
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Unread 02-21-2014, 01:14 PM   #4
grandboost98
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Quote:
Originally Posted by Que89YJ View Post
There are some options if you decide to replace it. You can find and drop in a poly tank from a 91-95 with the skid and tank and pickup an extra 5 gallons.
This x2

I wish I had gone with a larger tank. You can also cut out a panel above the pump to make future work easier
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89 Jeep Wrangler - 3.5" HD BDS lift and M.O.R.E. HD 5/8" booms on 33s
99 Jeep Cherokee - 2 door, 5" lift on 33" super swampers
72 Chevy Nova - build in progress
98 Pontiac Grand Prix GTP - too many mods to list::SOLD::
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Unread 02-21-2014, 04:57 PM   #5
Mambo_Dave
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1991 YJ Wrangler 
 
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Mine gets extremely loud at the end of a 80 mile trip. And it isn't the original pump, and it isn't eh second pump...

The second pump got changed out because it was running all the time, but the problem is so is this third pump.

Not sure what to do about it. One one hand the motor is certainly not starved for fuel, so I doubt it's the filter, but on the other hand I am having a tough time figuring out just where the fuel pressure regulator is (looks like a small one up on the fuel rail, but the FPR's for sale look like they go back by the pump?).
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Unread 02-21-2014, 09:26 PM   #6
Mark05059
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1989 YJ Wrangler 
 
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Location: quechee Vermont
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stock FPRs are on the fuel rail in YJ's
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Unread 02-23-2014, 10:14 AM   #7
RedRockRed
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Quote:
Originally Posted by Que89YJ View Post
It means your fuel pump is begining to wear out. If it is your DD then you might want to take a proactive step and replace it. If Not hen what Grandboost said. There are some options if you decide to replace it. You can find and drop in a poly tank from a 91-95 with the skid and tank and pickup an extra 5 gallons.
If the pump is on its last legs, will it go gradually and give me some warning before leaving me on the side of the road? Or is this noise all the warning I'm going to get?
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Unread 02-24-2014, 05:49 AM   #8
grandboost98
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One day youll go to start it up and just not here it prime and thats it
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89 Jeep Wrangler - 3.5" HD BDS lift and M.O.R.E. HD 5/8" booms on 33s
99 Jeep Cherokee - 2 door, 5" lift on 33" super swampers
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98 Pontiac Grand Prix GTP - too many mods to list::SOLD::
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