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Hello, and Good morning 5.0L Tech! So i'm finally getting around to tying up any odds or ends on my '90 LX. Ever since i purchased the vehicle it has made an electric whine i suppose you could call it. It comes from the rear of my vehicle next to my gas tank. It can be heard inside the vehicle and also outside the vehicle. The noise gets quieter when im driving, almost unnoticeable and when i rev up my engine it quiets down. Like the actual noise seems to become quieter not just my engine overpowering the noise. I've been given speculation on what it could be but not a reason as to why this is happening, the majority of people said it is likely my fuel pump as that is what it slightly sounds like and it is coming from around that general area. although im not sure how to go about the situation. Any advice or insight into this issue will be greatly appreciated! Thanks and have a wonderful day!

-Joe
 

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Yeam man thats the fuel pump youre hearing.Its normal to hear the fuel pump running,so you have nothing to worry about.The next time you get in the car to go somewhere,listen closely while you turn the key on/engine off.If this is the noise youre hearing,its the fuel pump.You can hear it even better if you remove the gas cap and put your ear close to the fill tube while someone turns the key on.

Rear gears can cause whining if the backlash was setup incorrectly,but you wouldve noticed this noise a long time ago.It wouldn't just pop up all of a sudden.
 
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