[Soflow540]

I notice a humming noise when driving my 2001 frontier throughout the day. I parked and listened and seems to be coming from the back of the truck under the bed. I have video but can't upload it onto the site. Has anyone came across same humming sound?

 

[jerryp58]

Fuel pump?

Exhaust vibration?

 

[DiceRolla]

my guess would be catalytic converter, like a pin hole

any water drip from your exshaust? Ive got some coming from just behind the cab and some from the tail pipe

 

[kevinjohnson3216]

If it's still humming when you're parked then it's either fuel pump or exhaust vibration

Sent from my XT1080 using Tapatalk

 

[BigDad]

I'm not sure this would work (it did on my 03 Mustang) when the fuel pump was going bad, i could hear it making noise, when I turned the key on but did not start. It would hum, and it's not supposed to.