The fuel pump is inside the fuel tank. It's supposed to hum or make a little noise; that's not a problem unless it sounds like a bad bearing or other serious problem. If you suspect the fuel pump, borrow, rent or buy a fuel pressure gauge and connect it to the fuel rail test port.
Ford Dealer can help you. And tell you if there is anything wrong with your 2003 F150.
Muffler loud noises
engine noise coming thru the radio is caused by a bad ground somewhere so instead of chasing that you go to a car stereo shop and buy a noise filter that hooks up to the ground wire coming off the radio.
If the dash lights go on and off and the heat won't turn off and electrical noise is coming from the heater, there could be a short in the wiring on a 1998 Blazer. This is also possible if the ground wire for these items is not longer attached.
Possible loose exhaust pipe, check hanger clamps.
I believe that an engine can create a noise underneath the middle of the hood....
wheel bearing or it could be the carrier bearing as was in my case
There is no valve adjustment on that engine. If you have noise coming from the valve train you probably have worn parts such as camshaft, lifters, pushrods, rocker arms and valves.
I have a `00 blazer and recently my car started making a loud winding noise also. Come to find out I had to have a whole new transmission due to that noise! The repair shop said that the noise is the first sign of the transmission going out!
Joyful Noise is coming out on DVD in June 2012
Describe the noise and the general area it is coming from and I would glad to answer the best way I can.
Check the wheel bearing. Make sure it is full of grease. Check the tie rod ends and ball joints as well.