Buzzing from fuel tank????

[slow88stang]

Since I got my ranger I have noticed a loud whinning/buzzing noise from underneath. At first I figured it was an exhaust leak but today I checked and everything is fine. So then i get my ear right under the truck while it is running. I found that the noise seems to be coming from the fuel tank. Its an ear pearcing sounds when you get within a 6 or 7 inches of the tank. It makes this sounds only when the truck is running and the tone never changes. Any ideas of what kind of problem I have to deal with???

 

[King of Cobras]

Since I got my ranger I have noticed a loud whinning/buzzing noise from underneath. At first I figured it was an exhaust leak but today I checked and everything is fine. So then i get my ear right under the truck while it is running. I found that the noise seems to be coming from the fuel tank. Its an ear pearcing sounds when you get within a 6 or 7 inches of the tank. It makes this sounds only when the truck is running and the tone never changes. Any ideas of what kind of problem I have to deal with???

It's called a electric fuel pump.

 

[slow88stang]

I know that but it is really loud. can hear it 5 houses down the street. way louder than the exhaust at WOT.

 

[speedracer238]

Turn the key to the on position, dont crank the engine. If it whines then its the fuel pump.

I've never heard an exhaust leak buzz or whine, just the usual ticking noise. I put my money on fuel pump

 

[redterror302]

I know that but it is really loud. can hear it 5 houses down the street. way louder than the exhaust at WOT.

Is your exhaust stock? I used to be able to clearly hear my fuel pump over my stock exhaust. I don't know about WOT though. Usually when they get louder, it means it is on its way out. I rode around with mine humming for a while, but upgraded when I had a chance.

 

[autoXr1]

Years ago when I had my stock 88lph fuel pump, it would whine pretty loud. I replaced it with a FMS 190lph fuel pump and it is pretty quiet. I think one of the tell-tale signs that the stock pump is on its way out is the loud buzzing. I can't imagine Ford would let it off the assembly line making that kind of noise.