I Have a Sierra 1500 crew cab with 152,900 miles . I change the oil every 3000 miles and maintain the truck-- new struts and bridgestones evos last year. In the past month I hear a short humming sound ( Like a cell phone vibrating) behind the rear seat,periodically while driving. I am wondering if this could be the fuel pump in the gas tank and it may be a warning that the pump is ready to fail.
You may be hearing reverberation from a failing rear wheel bearing, you could have a OBDII scanner take a snapshot of fuel pressure to ensure your pump is acting normal.
〉 Answered on Feb 11th, 2014 by Amanda J. Pierce, MBA "AJ", Certified Mechanic, Project Coordinator; Primavera Scheduler at VIGOR Alaska Industrial Shipyard & BizzM3ch Solutions
Yes. It may be the fuel pump but the only way to check is to take the tank down and then You may as well just replace it. Also, check under the car or see if anything is loose.
〉 Answered on Feb 11th, 2014 by Barb Petrey, President - DBK Enterprises Inc at Jiffy Lube
That sounds like a reasonable guess. Have your fuel pressure checked by a mechanic.
〉 Answered on Feb 11th, 2014 by Gelina Aquilina, Service Advisor / Mechanic at
It is possible that the fuel pump is on its way out. I would have a repair shop check how much amperage the fuel pump is drawing as this may indicate the fuel pump is going to fail sooner than later.
It is also possible that a wheel bearing is also on its way out. Either way, get it checked.
〉 Answered on Feb 11th, 2014 by Helaine Kurot, Owner/Technician at 360 Automotive