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Unread 06-28-2011, 08:43 PM   #1
iroll919
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1998 XJ Cherokee 
 
Join Date: Jan 2007
Location: colorado
Posts: 130
fuel pump whine/hum even after new fuel pump help!!

i have a 1992 yj 4.0

i bought the jeep a few months ago and on the first long drive i made as we were getting close to home the jeep started making an awful humming/ whine noise coming from the fuel tank area

i replaced the fuel pump with a replacement from checker/orielly along with a new fuel filter installed it and i still had the bad whining/ humming noise

maybe a month later i started having hard starting issues so i bought a gauge to check the fuel pressure and it wasn't holding what so ever so i dropped the tank again and exchanged the pump for another new one

and sure enough i am still getting the whining/ humming noise. its not an irregular thing every time i start the jeep it makes the noise the entire time its running whether i am idling or on the gas

i filled the jeep up today with fuel and it softened the noise very slightly but its still very very loud so loud it almost to the point i cant even hear the engine

the jeep runs great and fuel pressure is where it should be so the pump is working the noise is just driving me crazy

are all pumps this loud or did i just get 2 bad pumps in a row

im so frustrated with this issue any input is appreciated

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Unread 06-28-2011, 10:01 PM   #2
moonshinefuel
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1995 YJ Wrangler 
 
Join Date: Feb 2009
Location: Los Angeles. California. United States.
Posts: 4,911
Hum noise is normal, the pump is turning on. Whining..I dunno. Are these cheap remanufactured pumps? I did the floor hatch mod, and went with a new Bosch fuel pump, but that's just me.
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