Question about 1997 Ford F150 Regular Cab

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What does a fuel pump sound like when its going bad? Noise before total failure or a quick kaput? I noticed a new noise coming from under or rear of F-150. Fuel pump or differential?

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  • tim mcgrath May 11, 2010

    be underneath, have someone turn key on/start if you dont hear new noise you heard not the pump, yes pumps make noise and also kaput also

  • acrandall240 May 11, 2010

    fuel pumps usualy cannot be herd durring an idle,or while driving.before starting if you turn the key for a split second you might be able to hear a buzz but once started it should be silent.what kind of noise is it?

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Your truck is up in the air, maybe you could easily disconnect the fuel pump harness while the truck is running, or just pull the EFI fuse so that the fuel system will empty somewhat. Withe the engine not running you can also bleed the system carefully to get it so that when you turn on the ignition (not to start, just to on), you will hear the pump only. Turn it on & off in 3 to 5 second intervals at each position or even better, have someone else do that while you listen through the fuel cap opening (cap removed) & you'll know what the fuel pump is sounding like.

Going bad, they just run weak and low on pressure which you can test using the fitting in the engine compartment. The sound will be slower but hard to really tell the difference until they really start getting weak & slow.

Really Bad ones usually don't make noise, at best a hum without that "vibration" sound.


good luck

Posted on Feb 05, 2010

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