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Re: When I start my truck there is a humming noise for...
If on start up then humming noise could be from any moving part like Alternator, any pulley or even the power steering pump, then goes away as the bearing gets hot and expands.
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That humming noise may be your fuel pump burning out. Try turning the key to the on position while someone else listens near the gas tank. The humming should only hum for a few seconds so you won't have time to listen yourself unless you can hear it from inside. If the hum continues and doesnt shut off, it is likely a bad fuel pump. It is normal to hear a small hum for a couple of seconds , but when it starts getting weak, it will hum louder, longer, or not at all
Try to tighten the belts a little firm.Sounds like when engine idling no squelling only when about to take off .Some times belts may seem ok on the outside but if you look on inner side you tend to see cracks in the belts .
most likely if its a hum it could be tires , if its a roar it could be the drive train
support the vehicle on jack stands , start the engine , put in drive and let it idle, if noise is gone ...its the tires if not check the drive train ...start with fluid levels
Your fuel pump is supposed to hum, when you turn the key it primes the system and it will hum. When the car is running the fuel pump is running and it will hum. If the noise is excessive then try a higher quality fuel pump, it may be less noisy. You will hear the fuel pump on a lot of vehicles tho when you are sitting at a stop light with your radio off and everything quiet in the car.
you may not have enough fuel presur yet. try this -
turn key to on, listen for fuel pump noise (humming) for about 5 seconds. If no hum, you have a problem. If it hums, good. Now, turn key off for 30 seconds and turn key to "on" again. Repeat 5 times. Then try to start car.
The fel pump does run in "start" mode continually.
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