Fuel pump

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Mar 30, 2013 | 11:39 PM

Captaintim

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Joined: Mar 2013

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Fuel pump

Question
New to me a 1993 after a 60 or so run came home and noticed fuel pump humming what's next?

Mar 31, 2013 | 12:14 PM

leesvet

Safety Car

Joined: Apr 2011

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Likes: 22

fuel relay is probably stuck ON. Replace the relay.

Mar 31, 2013 | 05:18 PM

Captaintim

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Joined: Mar 2013

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Thanks
It's noticeable when it has been running for a while didn't,t know to be concerned or not new car to me getting acquainted with it. Its my only concern at this time

Mar 31, 2013 | 06:37 PM

vetteoz

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Joined: Jan 2004

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Quote:

Originally Posted by Captaintim

came home and noticed fuel pump humming

With the engine running or not ?????

Quote:

Originally Posted by leesvet

fuel relay is probably stuck ON.

More likely to be a faulty oil pressure switch that supplies power direct from the battery to the pump
( even when key is off )

Mar 31, 2013 | 08:56 PM

Captaintim

Thread Starter

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No not running when it's off.
After the car has been driven and at operating temp. At idle (I notice) the pump humming you could even feel the pump running through the fuel cap. No running problems just an elevated pump hum at idle. Thanks

Apr 1, 2013 | 07:13 PM

93Rubie

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Joined: Sep 2010

Posts: 3,752

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From: Indiana PA

Shoot that is normal. I car hear mine over my exhuast if I listen for it at idle. They are LOUD *** pumps. So are all GM fuel pumps from that vintage.

Apr 1, 2013 | 09:38 PM

Captaintim

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Good deal thanks for the info. Guess a little over sensitive worrying over something I'm not totally familiar with.

Apr 1, 2013 | 11:41 PM

leesvet

Safety Car

Joined: Apr 2011

Posts: 3,660

Likes: 22

Quote:

Originally Posted by vetteoz

With the engine running or not ?????

More likely to be a faulty oil pressure switch that supplies power direct from the battery to the pump
( even when key is off )

Great Point !

Yep. Thats a "hot always" circuit....and a direct path for power to the pump... I would not have ever thought of that.
Those OP switches get forgotten about as soon as everybody knows what they are and what they do. I did.

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Apr 7, 2013 | 10:26 PM

mixalive

Pro

Joined: Aug 2007

Posts: 668

Likes: 38

From: Austin TX

Hey guys. Can you tell me where is the Oil Pressure switch mounted on a 92 LT1?

Apr 7, 2013 | 10:43 PM

#10

l98tpi

Max G’s

Joined: Nov 2008

Posts: 2,751

Likes: 78

From: Monroe OH

NCM Sinkhole Donor

The fuel pump has a vibration dampener on it. They reduce vibration, which in turn makes the humming noise you hear. I replaced my fuel pump a couple years ago and have to really listen to hear it come on when turn the ignition switch to on. Your dampener is probably missing. It is not necessary, but will help prolong the life of the fuel pump. And if you need to replace your fuel pump it's not a hard task.