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I have a 2001 ford expedition and it had been making a humming sound while the running and then for a few minutes after being shut off. Eventually the fuel pump had went out. Immediatly after replacing the fuel pump with a brand new one I tried the car and it was still making the humming sound. The car ran fine but the gas gage was registering wrong. It ran fine for a few months but now has began kinda hesitating when Im accelerating kinda like its not getting enough gas, after doing this and increasingly getting more and more frequent my check engine light came on and it read misfire on cylinder 5. I had plugs changed about the time the pump was replaced and also I changed the fuel filter, at that time as well. After haveing the code read the check engine light went off and has remained off but every now and then the car will do the hesitating thing. Any suggestions on what maybe this could be??

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The humming noise it not good,if the whole assembely was not replaced,you may have to replace it as an assembely,instead of just the pump,now,if you did put the whole assembely in,then it is defective,and you need to replace it.Also,fuel injection cleaner might help with this situation,try lucas,to as little fuel as possible for a consentrated effect,it will clean the injectors better and quicker.

Posted on May 26, 2010

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